Speech and multimedia Transmission Quality (STQ) - Transmission requirements for wideband VoIP terminals (handset and headset) from a QoS perspective as perceived by the user

The present document provides speech transmission performance requirements for 8 kHz wideband VoIP handset and headset terminals; it addresses all types of IP based terminals, including wireless and soft phones. DECT terminals are covered in ETSI EN 300 175-8 [i.9] and ETSI EN 300 176-2 [i.10]. In contrast to other standards which define minimum performance requirements it is the intention of the present document to specify terminal equipment requirements which enable manufacturers and service providers to enable good quality end-to-end speech performance as perceived by the user. In addition to basic testing procedures, the present document describes advanced testing procedures taking into account
further quality parameters as perceived by the user.

Kakovost prenosa govora in večpredstavnih vsebin (STQ) - Prenosne zahteve za širokopasovne terminale VoIP (ročne in naglavne) glede na kakovost storitev (QoS), kot jo dojema uporabnik

General Information

Status
Published
Publication Date
25-May-2020
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
25-May-2020
Due Date
30-Jul-2020
Completion Date
26-May-2020

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ETSI ES 202 739 V1.8.1 (2020-05)
ETSI STANDARD
Speech and multimedia Transmission Quality (STQ);
Transmission requirements for wideband
VoIP terminals (handset and headset)
from a QoS perspective as perceived by the user
---------------------- Page: 1 ----------------------
2 ETSI ES 202 739 V1.8.1 (2020-05)
Reference
RES/STQ-276
Keywords
quality, speech, telephony, terminal, VoIP,
wideband
ETSI
650 Route des Lucioles
F-06921 Sophia Antipolis Cedex - FRANCE
Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16
Siret N° 348 623 562 00017 - NAF 742 C
Association à but non lucratif enregistrée à la
Sous-Préfecture de Grasse (06) N° 7803/88
Important notice
The present document can be downloaded from:
http://www.etsi.org/standards-search

The present document may be made available in electronic versions and/or in print. The content of any electronic and/or

print versions of the present document shall not be modified without the prior written authorization of ETSI. In case of any

existing or perceived difference in contents between such versions and/or in print, the prevailing version of an ETSI

deliverable is the one made publicly available in PDF format at www.etsi.org/deliver.

Users of the present document should be aware that the document may be subject to revision or change of status.

Information on the current status of this and other ETSI documents is available at

https://portal.etsi.org/TB/ETSIDeliverableStatus.aspx

If you find errors in the present document, please send your comment to one of the following services:

https://portal.etsi.org/People/CommiteeSupportStaff.aspx
Copyright Notification

No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying

and microfilm except as authorized by written permission of ETSI.

The content of the PDF version shall not be modified without the written authorization of ETSI.

The copyright and the foregoing restriction extend to reproduction in all media.
© ETSI 2020.
All rights reserved.

DECT™, PLUGTESTS™, UMTS™ and the ETSI logo are trademarks of ETSI registered for the benefit of its Members.

3GPP™ and LTE™ are trademarks of ETSI registered for the benefit of its Members and

of the 3GPP Organizational Partners.

oneM2M™ logo is a trademark of ETSI registered for the benefit of its Members and

of the oneM2M Partners.
GSM and the GSM logo are trademarks registered and owned by the GSM Association.
ETSI
---------------------- Page: 2 ----------------------
3 ETSI ES 202 739 V1.8.1 (2020-05)
Contents

Intellectual Property Rights ................................................................................................................................ 5

Foreword ............................................................................................................................................................. 5

Modal verbs terminology .................................................................................................................................... 5

Introduction ........................................................................................................................................................ 5

1 Scope ........................................................................................................................................................ 6

2 References ................................................................................................................................................ 6

2.1 Normative references ......................................................................................................................................... 6

2.2 Informative references ........................................................................................................................................ 7

3 Definition of terms, symbols and abbreviations ....................................................................................... 8

3.1 Terms .................................................................................................................................................................. 8

3.2 Symbols .............................................................................................................................................................. 9

3.3 Abbreviations ..................................................................................................................................................... 9

4 General considerations ........................................................................................................................... 10

4.1 Coding algorithm .............................................................................................................................................. 10

4.2 End-to-end considerations ................................................................................................................................ 10

5 Test equipment ....................................................................................................................................... 10

5.1 IP half channel measurement adaptor ............................................................................................................... 10

5.2 Environmental conditions for tests ................................................................................................................... 10

5.3 Accuracy of measurements and test signal generation ..................................................................................... 11

5.4 Network impairment simulation ....................................................................................................................... 11

5.5 Acoustic environment ....................................................................................................................................... 12

5.6 Influence of terminal delay on measurements .................................................................................................. 12

6 Requirements and associated measurement methodologies ................................................................... 12

6.1 Notes ................................................................................................................................................................ 12

6.2 Test setup.......................................................................................................................................................... 12

6.2.1 General ........................................................................................................................................................ 12

6.2.2 Setup for handsets and headsets .................................................................................................................. 13

6.2.3 Position and calibration of HATS ............................................................................................................... 14

6.2.4 Test signal levels ......................................................................................................................................... 14

6.2.5 Setup of background noise simulation ........................................................................................................ 14

6.2.6 Setup of variable echo path ......................................................................................................................... 14

6.2.7 Setup for testing positionial robustness of handsets ................................................................................... 16

6.3 Coding independent parameters ....................................................................................................................... 17

6.3.1 Send frequency response ............................................................................................................................ 17

6.3.1.1 Send frequency response - nominal position ......................................................................................... 17

6.3.1.2 Send frequency response - positional robustness .................................................................................. 18

6.3.2 Send Loudness Rating (SLR)...................................................................................................................... 18

6.3.2.1 Send Loudness Rating (SLR) - nominal position .................................................................................. 18

6.3.2.2 Send Loudness Rating (SLR) - positional robustness ........................................................................... 19

6.3.3 Mic mute ..................................................................................................................................................... 19

6.3.4 Quality of send AGC (Automatic Gain Control) ........................................................................................ 19

6.3.5 Send distortion ............................................................................................................................................ 19

6.3.6 Out-of-band signals in send direction ......................................................................................................... 20

6.3.7 Send noise ................................................................................................................................................... 21

6.3.8 SideTone Masking Rating STMR (mouth to ear) ....................................................................................... 21

6.3.9 Sidetone delay ............................................................................................................................................. 22

6.3.10 Terminal Coupling Loss (TCL) .................................................................................................................. 22

6.3.11 Stability loss................................................................................................................................................ 23

6.3.12 Receive frequency response ........................................................................................................................ 24

6.3.12.1 Receive frequency response - nominal position .................................................................................... 24

6.3.12.2 Receive frequency response - positional robustness ............................................................................. 27

6.3.13 Receive Loudness Rating (RLR) ................................................................................................................ 27

ETSI
---------------------- Page: 3 ----------------------
4 ETSI ES 202 739 V1.8.1 (2020-05)

6.3.13.1 Receive Loudness Rating (RLR) - nominal position ............................................................................ 27

6.3.13.2 Receive Loudness Rating (RLR) - positional robustness ...................................................................... 28

6.3.14 Receive distortion ....................................................................................................................................... 28

6.3.15 Out-of-band signals in receive direction ..................................................................................................... 29

6.3.16 Minimum activation level and sensitivity in receive direction ................................................................... 29

6.3.17 Receive noise .............................................................................................................................................. 29

6.3.18 Automatic level control in receive .............................................................................................................. 30

6.3.19 Double talk performance ............................................................................................................................ 30

6.3.19.1 General .................................................................................................................................................. 30

6.3.19.2 Attenuation range in send direction during double talk A .............................................................. 30

H,S,dt

6.3.19.3 Attenuation range in receive direction during double talk A ......................................................... 31

H,R,dt

6.3.19.4 Detection of echo components during double talk ................................................................................ 32

6.3.19.5 Minimum activation level and sensitivity of double talk detection ....................................................... 33

6.3.20 Switching characteristics ............................................................................................................................ 34

6.3.20.1 Note ....................................................................................................................................................... 34

6.3.20.2 Activation in send direction .................................................................................................................. 34

6.3.20.3 Silence suppression and comfort noise generation ................................................................................ 34

6.3.21 Background noise performance .................................................................................................................. 35

6.3.21.1 Performance in send in the presence of background noise .................................................................... 35

6.3.21.2 Speech quality in the presence of background noise ............................................................................. 35

6.3.21.3 Quality of background noise transmission (with far end speech).......................................................... 36

6.3.21.4 Positional Robustness of Speech Quality in the Presence of Background Noise .................................. 37

6.3.22 Quality of echo cancellation ....................................................................................................................... 37

6.3.22.1 Temporal echo effects ........................................................................................................................... 37

6.3.22.2 Spectral echo attenuation ...................................................................................................................... 38

6.3.22.3 Occurrence of artefacts ......................................................................................................................... 38

6.3.22.4 Variable echo path................................................................................................................................. 38

6.3.23 Variant impairments ................................................................................................................................... 39

6.3.23.1 Clock accuracy send .............................................................................................................................. 39

6.3.23.2 Clock accuracy receive ......................................................................................................................... 39

6.3.23.3 Send packet delay variation................................................................................................................... 40

6.3.24 Send and receive delay - round trip delay ................................................................................................... 40

6.4 Codec specific requirements............................................................................................................................. 42

6.4.1 Objective listening speech quality MOS-LQO in send direction ................................................................ 42

6.4.2 Objective listening speech quality MOS-LQO in receive direction............................................................ 43

6.4.3 Quality of jitter buffer adjustment .............................................................................................................. 45

Annex A (informative): Processing delays in VoIP terminals ............................................................ 47

Annex B (informative): Optimum frequency responses for wideband transmission in receive

direction - underlying subjective experiments ............................................ 50

Annex C (informative): Bibliography ................................................................................................... 52

History .............................................................................................................................................................. 53

ETSI
---------------------- Page: 4 ----------------------
5 ETSI ES 202 739 V1.8.1 (2020-05)
Intellectual Property Rights
Essential patents

IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The information

pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found

in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in

respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web

server (https://ipr.etsi.org/).

Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee

can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web

server) which are, or may be, or may become, essential to the present document.
Trademarks

The present document may include trademarks and/or tradenames which are asserted and/or registered by their owners.

ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no

right to use or reproduce any trademark and/or tradename. Mention of those trademarks in the present document does

not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks.

Foreword

This ETSI Standard (ES) has been produced by ETSI Technical Committee Speech and multimedia Transmission

Quality (STQ).
Modal verbs terminology

In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and

"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of

provisions).

"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.

Introduction

Traditionally, analogue and digital telephones were interfacing switched-circuit 64 kbit/s PCM networks. With the fast

growth of IP networks, wideband terminals providing higher audio-bandwidth and directly interfacing packet-switched

networks (VoIP) are being rapidly introduced. Such IP network edge devices may include gateways, specifically

designed IP phones, soft phones or other devices connected to the IP based networks and providing telephony service.

Since the IP networks will be in many cases interworking with the traditional PSTN and private networks, many of the

basic transmission requirements have to be harmonised with specifications for traditional digital terminals. However,

due to the unique characteristics of the IP networks including packet loss, delay, etc., new performance specification, as

well as appropriate measurement methods, will have to be developed. Terminals are getting increasingly complex,

advanced signal processing is used to address the IP specific issues.

The advanced signal processing of terminals is targeted to speech signals. Therefore, wherever possible speech signals

are used for testing in order to achieve mostly realistic test conditions and meaningful results.

The present document provides speech transmission performance requirements for wideband VoIP handset and headset

terminals.

NOTE: Requirement limits are given in tables, the associated curve when provided is given for illustration.

ETSI
---------------------- Page: 5 ----------------------
6 ETSI ES 202 739 V1.8.1 (2020-05)
1 Scope

The present document provides speech transmission performance requirements for 8 kHz wideband VoIP handset and

headset terminals; it addresses all types of IP based terminals, including wireless and soft phones.

DECT terminals are covered in ETSI EN 300 175-8 [i.9] and ETSI EN 300 176-2 [i.10].

In contrast to other standards which define minimum performance requirements it is the intention of the present

document to specify terminal equipment requirements which enable manufacturers and service providers to enable good

quality end-to-end speech performance as perceived by the user.

In addition to basic testing procedures, the present document describes advanced testing procedures taking into account

further quality parameters as perceived by the user.
2 References
2.1 Normative references

References are either specific (identified by date of publication and/or edition number or version number) or

non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the

referenced document (including any amendments) applies.

Referenced documents which are not found to be publicly available in the expected location might be found at

https://docbox.etsi.org/Reference.

NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee

their long term validity.

The following referenced documents are necessary for the application of the present document.

[1] Recommendation ITU-T G.107: "The E-model: a computational model for use in transmission

planning".
[2] Recommendation ITU-T G.108: "Application of the E-model: A planning guide".

[3] Recommendation ITU-T G.109: "Definition of categories of speech transmission quality".

[4] Void.
[5] Recommendation ITU-T G.722: "7 kHz audio-coding within 64 kbit/s".

[6] Recommendation ITU-T G.722.1: "Low-complexity coding at 24 and 32 kbit/s for hands-free

operation in systems with low frame loss".

[7] Recommendation ITU-T G.729.1: "G.729-based embedded variable bit-rate coder: An 8-32 kbit/s

scalable wideband coder bitstream interoperable with G.729".
[8] Recommendation ITU-T P.56: "Objective measurement of active speech level".
[9] Recommendation ITU-T P.57: "Artificial ears".
[10] Recommendation ITU-T P.58: "Head and torso simulator for telephonometry".

[11] Recommendation ITU-T P.64: "Determination of sensitivity/frequency characteristics of local

telephone systems".

[12] Recommendation ITU-T P.79: "Calculation of loudness ratings for telephone sets".

[13] Recommendation ITU-T P.340: "Transmission characteristics and speech quality parameters of

hands-free terminals".
[14] Recommendation ITU-T P.380: "Electro-acoustic measurements on headsets".
ETSI
---------------------- Page: 6 ----------------------
7 ETSI ES 202 739 V1.8.1 (2020-05)
[15] Recommendation ITU-T P.501: "Test signals for use in telephonometry".

[16] Recommendation ITU-T P.502: "Objective test methods for speech communication systems using

complex test signals".

[17] Recommendation ITU-T P.581: "Use of head and torso simulator for hands-free and handset

terminal testing".

[18] IEC 61260-1: "Electroacoustics - Octave-band and fractional-octave-band filters - Part 1:

Specifications".

[19] TIA-920.130 Revision B (April 2018): "Telecommunications Communications Products

Transmission Requirements for Digital Interface Communications Devices with Headsets".

[20] ETSI TS 103 224: "Speech and multimedia Transmission Quality (STQ); A sound field

reproduction method for terminal testing including a background noise database".

[21] Recommendation ITU-T P.863: "Perceptual objective listening quality prediction".

[22] Recommendation ITU-T P.863.1: "Application Guide for Recommendation ITU-T P.863".

[23] ETSI ES 202 737: "Speech and multimedia Transmission Quality (STQ); Transmission

requirements for narrowband VoIP terminals (handset and headset) from a QoS perspective as

perceived by the user".

[24] Recommendation ITU-T P.1010: "Fundamental voice transmission objectives for VoIP terminals

and gateways".

[25] Recommendation ITU-T G.722.2: "Wideband coding of speech at around 16 kbit/s using Adaptive

Multi-Rate Wideband (AMR-WB)".
[26] IETF RFC 3550: "RTP: A Transport Protocol for Real-Time Applications".

[27] Recommendation ITU-T G.122: "Influence of national systems on stability and talker echo in

international connections".
[28] Recommendation ITU-T G.107.1: "Wideband E-Model".

[29] Recommendation ITU-T G.711: "Pulse code modulation (PCM) of voice frequencies".

[30] Recommendation ITU-T G.729: "Coding of speech at 8 kbit/s using conjugate-structure algebraic-

code-excited linear prediction (CS-ACELP)".

[31] Recommendation ITU-T G.723.1: "Dual rate speech coder for multimedia communications

transmitting at 5.3 and 6.3 kbit/s".
2.2 Informative references

References are either specific (identified by date of publication and/or edition number or version number) or

non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the

referenced document (including any amendments) applies.

NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee

their long term validity.

The following referenced documents are not necessary for the application of the present document but they assist the

user with regard to a particular subject area.

[i.1] ETSI EG 201 377-1: "Speech and multimedia Transmission Quality (STQ); Specification and

measurement of speech transmission quality; Part 1: Introduction to objective comparison

measurement methods for one-way speech quality across networks".

[i.2] ETSI EG 202 425: "Speech Processing, Transmission and Quality Aspects (STQ); Definition and

implementation of VoIP reference point".
ETSI
---------------------- Page: 7 ----------------------
8 ETSI ES 202 739 V1.8.1 (2020-05)

[i.3] ETSI EG 202 396-3: "Speech and multimedia Transmission Quality (STQ); Speech Quality

performance in the presence of background noise; Part 3: Background noise transmission -

Objective test methods".
[i.4] Recommendation ITU-T P.800.1: "Mean Opinion Score (MOS) Terminology".
[i.5] Netem™.
NOTE: Available at https://wiki.linuxfoundation.org/networking/netem.

[i.6] DAGA 2008: "Testing Wideband Terminals", March 10-13, Dresden, Proceedings. Poschen S.,

Kettler F., Raake A., Spors S.

[i.7] ETSI ES 202 739 (V1.2.1): "Speech Processing, Transmission and Quality Aspects (STQ);

Transmission requirements for wideband VoIP terminals (handset and headset) from a QoS

perspective as perceived by the user".
[i.8] IETF RFC 4737: "Packet Reordering Metrics".

[i.9] ETSI EN 300 175-8: "Digital Enhanced Cordless Telecommunications (DECT); Common

Interface (CI); Part 8: Speech and audio coding and transmission".

[i.10] ETSI EN 300 176-2: "Digital Enhanced Cordless Telecommunications (DECT); Test

specification; Part 2: Audio and speech".
3 Definition of terms, symbols and abbreviations
3.1 Terms
For the purposes of the present document, the following terms apply:

artificial ear: device for the calibration of earphones incorporating an acoustic coupler and a calibrated microphone for

the measurement of the sound pressure and having an overall acoustic impedance similar to that of the median adult

human ear over a given frequency band

codec: combination of an analogue-to-digital encoder and a digital-to-analogue decoder operating in opposite directions

of transmission in the same equipment

diffuse field equalization: equalization of the HATS sound pick-up, equalization of the difference, in dB, between the

spectrum level of the acoustic pressure at the ear-Drum Reference Point (DRP) and the spectrum level of the acoustic

pressure at the HATS Reference Point (HRP) in a diffuse sound field with the HATS absent using the reverse nominal

curve given in Table 3 of Recommendation ITU-T P.58 [10]

ear-Drum Reference Point (DRP): point located at the end of the ear canal, corresponding to the ear-drum position

freefield reference point: point located in the free sound field, at least in 1,5 m distance from a sound source radiating

in free air (in case of a head and torso simulator (HATS) in the centre of the artificial head with no artificial head

present)

Head And Torso Simulator (HATS) for telephonometry: manikin extending downward from the top of the head to

the waist, designed to simulate the sound pick-up characteristics and the acoustic diffraction produced by a median

human adult and to reproduce the acoustic field generated by the human mouth

Mouth Reference Point (MRP): point located on axis and 25 mm in front of the lip plane of a mouth simulator

nominal setting of the volume control: when a receive volume control is provided, the setting which is closest to the

nominal RLR of 2 dB

reordering: packet order changes during transfer over the network [i.8], packets arrive out of order at the receiver

(i.e. RTP packets)
ETSI
---------------------- Page: 8 ----------------------
9 ETSI ES 202 739 V1.8.1 (2020-05)
3.2 Symbols
Void.
3.3 Abbreviations
For the purposes of the present document, the following abbreviations apply:
AGC Automatic Gain Control
AM-FM Amplitude Modulation-Frequency Modulation
AMR-WB Adaptive Multi Rate - Wideband
CS Composite Source
CSS Composite Source
...

Final draft ETSI ES 202 739 V1.8.1 (2020-03)
ETSI STANDARD
Speech and multimedia Transmission Quality (STQ);
Transmission requirements for wideband
VoIP terminals (handset and headset)
from a QoS perspective as perceived by the user
---------------------- Page: 1 ----------------------
2 Final draft ETSI ES 202 739 V1.8.1 (2020-03)
Reference
RES/STQ-276
Keywords
quality, speech, telephony, terminal, VoIP,
wideband
ETSI
650 Route des Lucioles
F-06921 Sophia Antipolis Cedex - FRANCE
Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16
Siret N° 348 623 562 00017 - NAF 742 C
Association à but non lucratif enregistrée à la
Sous-Préfecture de Grasse (06) N° 7803/88
Important notice
The present document can be downloaded from:
http://www.etsi.org/standards-search

The present document may be made available in electronic versions and/or in print. The content of any electronic and/or

print versions of the present document shall not be modified without the prior written authorization of ETSI. In case of any

existing or perceived difference in contents between such versions and/or in print, the prevailing version of an ETSI

deliverable is the one made publicly available in PDF format at www.etsi.org/deliver.

Users of the present document should be aware that the document may be subject to revision or change of status.

Information on the current status of this and other ETSI documents is available at

https://portal.etsi.org/TB/ETSIDeliverableStatus.aspx

If you find errors in the present document, please send your comment to one of the following services:

https://portal.etsi.org/People/CommiteeSupportStaff.aspx
Copyright Notification

No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying

and microfilm except as authorized by written permission of ETSI.

The content of the PDF version shall not be modified without the written authorization of ETSI.

The copyright and the foregoing restriction extend to reproduction in all media.
© ETSI 2020.
All rights reserved.

DECT™, PLUGTESTS™, UMTS™ and the ETSI logo are trademarks of ETSI registered for the benefit of its Members.

3GPP™ and LTE™ are trademarks of ETSI registered for the benefit of its Members and

of the 3GPP Organizational Partners.

oneM2M™ logo is a trademark of ETSI registered for the benefit of its Members and

of the oneM2M Partners.
GSM and the GSM logo are trademarks registered and owned by the GSM Association.
ETSI
---------------------- Page: 2 ----------------------
3 Final draft ETSI ES 202 739 V1.8.1 (2020-03)
Contents

Intellectual Property Rights ................................................................................................................................ 5

Foreword ............................................................................................................................................................. 5

Modal verbs terminology .................................................................................................................................... 5

Introduction ........................................................................................................................................................ 5

1 Scope ........................................................................................................................................................ 6

2 References ................................................................................................................................................ 6

2.1 Normative references ......................................................................................................................................... 6

2.2 Informative references ........................................................................................................................................ 7

3 Definition of terms, symbols and abbreviations ....................................................................................... 8

3.1 Terms .................................................................................................................................................................. 8

3.2 Symbols .............................................................................................................................................................. 9

3.3 Abbreviations ..................................................................................................................................................... 9

4 General considerations ........................................................................................................................... 10

4.1 Coding algorithm .............................................................................................................................................. 10

4.2 End-to-end considerations ................................................................................................................................ 10

5 Test equipment ....................................................................................................................................... 10

5.1 IP half channel measurement adaptor ............................................................................................................... 10

5.2 Environmental conditions for tests ................................................................................................................... 10

5.3 Accuracy of measurements and test signal generation ..................................................................................... 11

5.4 Network impairment simulation ....................................................................................................................... 11

5.5 Acoustic environment ....................................................................................................................................... 12

5.6 Influence of terminal delay on measurements .................................................................................................. 12

6 Requirements and associated measurement methodologies ................................................................... 12

6.1 Notes ................................................................................................................................................................ 12

6.2 Test setup.......................................................................................................................................................... 12

6.2.1 General ........................................................................................................................................................ 12

6.2.2 Setup for handsets and headsets .................................................................................................................. 13

6.2.3 Position and calibration of HATS ............................................................................................................... 14

6.2.4 Test signal levels ......................................................................................................................................... 14

6.2.5 Setup of background noise simulation ........................................................................................................ 14

6.2.6 Setup of variable echo path ......................................................................................................................... 14

6.2.7 Setup for testing positionial robustness of handsets ................................................................................... 16

6.3 Coding independent parameters ....................................................................................................................... 17

6.3.1 Send frequency response ............................................................................................................................ 17

6.3.1.1 Send frequency response - nominal position ......................................................................................... 17

6.3.1.2 Send frequency response - positional robustness .................................................................................. 18

6.3.2 Send Loudness Rating (SLR)...................................................................................................................... 18

6.3.2.1 Send Loudness Rating (SLR) - nominal position .................................................................................. 18

6.3.2.2 Send Loudness Rating (SLR) - positional robustness ........................................................................... 19

6.3.3 Mic mute ..................................................................................................................................................... 19

6.3.4 Quality of send AGC (Automatic Gain Control) ........................................................................................ 19

6.3.5 Send distortion ............................................................................................................................................ 19

6.3.6 Out-of-band signals in send direction ......................................................................................................... 20

6.3.7 Send noise ................................................................................................................................................... 21

6.3.8 SideTone Masking Rating STMR (mouth to ear) ....................................................................................... 21

6.3.9 Sidetone delay ............................................................................................................................................. 22

6.3.10 Terminal Coupling Loss (TCL) .................................................................................................................. 22

6.3.11 Stability loss................................................................................................................................................ 23

6.3.12 Receive frequency response ........................................................................................................................ 24

6.3.12.1 Receive frequency response - nominal position .................................................................................... 24

6.3.12.2 Receive frequency response - positional robustness ............................................................................. 27

6.3.13 Receive Loudness Rating (RLR) ................................................................................................................ 27

ETSI
---------------------- Page: 3 ----------------------
4 Final draft ETSI ES 202 739 V1.8.1 (2020-03)

6.3.13.1 Receive Loudness Rating (RLR) - nominal position ............................................................................ 27

6.3.13.2 Receive Loudness Rating (RLR) - positional robustness ...................................................................... 28

6.3.14 Receive distortion ....................................................................................................................................... 28

6.3.15 Out-of-band signals in receive direction ..................................................................................................... 29

6.3.16 Minimum activation level and sensitivity in receive direction ................................................................... 29

6.3.17 Receive noise .............................................................................................................................................. 29

6.3.18 Automatic level control in receive .............................................................................................................. 30

6.3.19 Double talk performance ............................................................................................................................ 30

6.3.19.1 General .................................................................................................................................................. 30

6.3.19.2 Attenuation range in send direction during double talk A .............................................................. 30

H,S,dt

6.3.19.3 Attenuation range in receive direction during double talk A ......................................................... 31

H,R,dt

6.3.19.4 Detection of echo components during double talk ................................................................................ 32

6.3.19.5 Minimum activation level and sensitivity of double talk detection ....................................................... 33

6.3.20 Switching characteristics ............................................................................................................................ 34

6.3.20.1 Note ....................................................................................................................................................... 34

6.3.20.2 Activation in send direction .................................................................................................................. 34

6.3.20.3 Silence suppression and comfort noise generation ................................................................................ 34

6.3.21 Background noise performance .................................................................................................................. 35

6.3.21.1 Performance in send in the presence of background noise .................................................................... 35

6.3.21.2 Speech quality in the presence of background noise ............................................................................. 35

6.3.21.3 Quality of background noise transmission (with far end speech).......................................................... 36

6.3.21.4 Positional Robustness of Speech Quality in the Presence of Background Noise .................................. 37

6.3.22 Quality of echo cancellation ....................................................................................................................... 37

6.3.22.1 Temporal echo effects ........................................................................................................................... 37

6.3.22.2 Spectral echo attenuation ...................................................................................................................... 38

6.3.22.3 Occurrence of artefacts ......................................................................................................................... 38

6.3.22.4 Variable echo path................................................................................................................................. 38

6.3.23 Variant impairments ................................................................................................................................... 39

6.3.23.1 Clock accuracy send .............................................................................................................................. 39

6.3.23.2 Clock accuracy receive ......................................................................................................................... 39

6.3.23.3 Send packet delay variation................................................................................................................... 40

6.3.24 Send and receive delay - round trip delay ................................................................................................... 40

6.4 Codec specific requirements............................................................................................................................. 42

6.4.1 Objective listening speech quality MOS-LQO in send direction ................................................................ 42

6.4.2 Objective listening speech quality MOS-LQO in receive direction............................................................ 43

6.4.3 Quality of jitter buffer adjustment .............................................................................................................. 45

Annex A (informative): Processing delays in VoIP terminals ............................................................ 47

Annex B (informative): Optimum frequency responses for wideband transmission in receive

direction - underlying subjective experiments ............................................ 50

Annex C (informative): Bibliography ................................................................................................... 52

History .............................................................................................................................................................. 53

ETSI
---------------------- Page: 4 ----------------------
5 Final draft ETSI ES 202 739 V1.8.1 (2020-03)
Intellectual Property Rights
Essential patents

IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The information

pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found

in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in

respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web

server (https://ipr.etsi.org/).

Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee

can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web

server) which are, or may be, or may become, essential to the present document.
Trademarks

The present document may include trademarks and/or tradenames which are asserted and/or registered by their owners.

ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no

right to use or reproduce any trademark and/or tradename. Mention of those trademarks in the present document does

not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks.

Foreword

This final draft ETSI Standard (ES) has been produced by ETSI Technical Committee Speech and multimedia

Transmission Quality (STQ), and is now submitted for the ETSI standards Membership Approval Procedure.

Modal verbs terminology

In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and

"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of

provisions).

"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.

Introduction

Traditionally, analogue and digital telephones were interfacing switched-circuit 64 kbit/s PCM networks. With the fast

growth of IP networks, wideband terminals providing higher audio-bandwidth and directly interfacing packet-switched

networks (VoIP) are being rapidly introduced. Such IP network edge devices may include gateways, specifically

designed IP phones, soft phones or other devices connected to the IP based networks and providing telephony service.

Since the IP networks will be in many cases interworking with the traditional PSTN and private networks, many of the

basic transmission requirements have to be harmonised with specifications for traditional digital terminals. However,

due to the unique characteristics of the IP networks including packet loss, delay, etc., new performance specification, as

well as appropriate measurement methods, will have to be developed. Terminals are getting increasingly complex,

advanced signal processing is used to address the IP specific issues.

The advanced signal processing of terminals is targeted to speech signals. Therefore, wherever possible speech signals

are used for testing in order to achieve mostly realistic test conditions and meaningful results.

The present document provides speech transmission performance requirements for wideband VoIP handset and headset

terminals.

NOTE: Requirement limits are given in tables, the associated curve when provided is given for illustration.

ETSI
---------------------- Page: 5 ----------------------
6 Final draft ETSI ES 202 739 V1.8.1 (2020-03)
1 Scope

The present document provides speech transmission performance requirements for 8 kHz wideband VoIP handset and

headset terminals; it addresses all types of IP based terminals, including wireless and soft phones.

DECT terminals are covered in ETSI EN 300 175-8 [i.9] and ETSI EN 300 176-2 [i.10].

In contrast to other standards which define minimum performance requirements it is the intention of the present

document to specify terminal equipment requirements which enable manufacturers and service providers to enable good

quality end-to-end speech performance as perceived by the user.

In addition to basic testing procedures, the present document describes advanced testing procedures taking into account

further quality parameters as perceived by the user.
2 References
2.1 Normative references

References are either specific (identified by date of publication and/or edition number or version number) or

non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the

referenced document (including any amendments) applies.

Referenced documents which are not found to be publicly available in the expected location might be found at

https://docbox.etsi.org/Reference.

NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee

their long term validity.

The following referenced documents are necessary for the application of the present document.

[1] Recommendation ITU-T G.107: "The E-model: a computational model for use in transmission

planning".
[2] Recommendation ITU-T G.108: "Application of the E-model: A planning guide".

[3] Recommendation ITU-T G.109: "Definition of categories of speech transmission quality".

[4] Void.
[5] Recommendation ITU-T G.722: "7 kHz audio-coding within 64 kbit/s".

[6] Recommendation ITU-T G.722.1: "Low-complexity coding at 24 and 32 kbit/s for hands-free

operation in systems with low frame loss".

[7] Recommendation ITU-T G.729.1: "G.729-based embedded variable bit-rate coder: An 8-32 kbit/s

scalable wideband coder bitstream interoperable with G.729".
[8] Recommendation ITU-T P.56: "Objective measurement of active speech level".
[9] Recommendation ITU-T P.57: "Artificial ears".
[10] Recommendation ITU-T P.58: "Head and torso simulator for telephonometry".

[11] Recommendation ITU-T P.64: "Determination of sensitivity/frequency characteristics of local

telephone systems".

[12] Recommendation ITU-T P.79: "Calculation of loudness ratings for telephone sets".

[13] Recommendation ITU-T P.340: "Transmission characteristics and speech quality parameters of

hands-free terminals".
[14] Recommendation ITU-T P.380: "Electro-acoustic measurements on headsets".
ETSI
---------------------- Page: 6 ----------------------
7 Final draft ETSI ES 202 739 V1.8.1 (2020-03)
[15] Recommendation ITU-T P.501: "Test signals for use in telephonometry".

[16] Recommendation ITU-T P.502: "Objective test methods for speech communication systems using

complex test signals".

[17] Recommendation ITU-T P.581: "Use of head and torso simulator for hands-free and handset

terminal testing".

[18] IEC 61260-1: "Electroacoustics - Octave-band and fractional-octave-band filters - Part 1:

Specifications".

[19] TIA-920.130 Revision B (April 2018): "Telecommunications Communications Products

Transmission Requirements for Digital Interface Communications Devices with Headsets".

[20] ETSI TS 103 224: "Speech and multimedia Transmission Quality (STQ); A sound field

reproduction method for terminal testing including a background noise database".

[21] Recommendation ITU-T P.863: "Perceptual objective listening quality prediction".

[22] Recommendation ITU-T P.863.1: "Application Guide for Recommendation ITU-T P.863".

[23] ETSI ES 202 737: "Speech and multimedia Transmission Quality (STQ); Transmission

requirements for narrowband VoIP terminals (handset and headset) from a QoS perspective as

perceived by the user".

[24] Recommendation ITU-T P.1010: "Fundamental voice transmission objectives for VoIP terminals

and gateways".

[25] Recommendation ITU-T G.722.2: "Wideband coding of speech at around 16 kbit/s using Adaptive

Multi-Rate Wideband (AMR-WB)".
[26] IETF RFC 3550: "RTP: A Transport Protocol for Real-Time Applications".

[27] Recommendation ITU-T G.122: "Influence of national systems on stability and talker echo in

international connections".
[28] Recommendation ITU-T G.107.1: "Wideband E-Model".

[29] Recommendation ITU-T G.711: "Pulse code modulation (PCM) of voice frequencies".

[30] Recommendation ITU-T G.729: "Coding of speech at 8 kbit/s using conjugate-structure algebraic-

code-excited linear prediction (CS-ACELP)".

[31] Recommendation ITU-T G.723.1: "Dual rate speech coder for multimedia communications

transmitting at 5.3 and 6.3 kbit/s".
2.2 Informative references

References are either specific (identified by date of publication and/or edition number or version number) or

non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the

referenced document (including any amendments) applies.

NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee

their long term validity.

The following referenced documents are not necessary for the application of the present document but they assist the

user with regard to a particular subject area.

[i.1] ETSI EG 201 377-1: "Speech and multimedia Transmission Quality (STQ); Specification and

measurement of speech transmission quality; Part 1: Introduction to objective comparison

measurement methods for one-way speech quality across networks".

[i.2] ETSI EG 202 425: "Speech Processing, Transmission and Quality Aspects (STQ); Definition and

implementation of VoIP reference point".
ETSI
---------------------- Page: 7 ----------------------
8 Final draft ETSI ES 202 739 V1.8.1 (2020-03)

[i.3] ETSI EG 202 396-3: "Speech and multimedia Transmission Quality (STQ); Speech Quality

performance in the presence of background noise; Part 3: Background noise transmission -

Objective test methods".
[i.4] Recommendation ITU-T P.800.1: "Mean Opinion Score (MOS) Terminology".
[i.5] Netem™.
NOTE: Available at https://wiki.linuxfoundation.org/networking/netem.

[i.6] DAGA 2008: "Testing Wideband Terminals", March 10-13, Dresden, Proceedings. Poschen S.,

Kettler F., Raake A., Spors S.

[i.7] ETSI ES 202 739 (V1.2.1): "Speech Processing, Transmission and Quality Aspects (STQ);

Transmission requirements for wideband VoIP terminals (handset and headset) from a QoS

perspective as perceived by the user".
[i.8] IETF RFC 4737: "Packet Reordering Metrics".

[i.9] ETSI EN 300 175-8: "Digital Enhanced Cordless Telecommunications (DECT); Common

Interface (CI); Part 8: Speech and audio coding and transmission".

[i.10] ETSI EN 300 176-2: "Digital Enhanced Cordless Telecommunications (DECT); Test

specification; Part 2: Audio and speech".
3 Definition of terms, symbols and abbreviations
3.1 Terms
For the purposes of the present document, the following terms apply:

artificial ear: device for the calibration of earphones incorporating an acoustic coupler and a calibrated microphone for

the measurement of the sound pressure and having an overall acoustic impedance similar to that of the median adult

human ear over a given frequency band

codec: combination of an analogue-to-digital encoder and a digital-to-analogue decoder operating in opposite directions

of transmission in the same equipment

diffuse field equalization: equalization of the HATS sound pick-up, equalization of the difference, in dB, between the

spectrum level of the acoustic pressure at the ear-Drum Reference Point (DRP) and the spectrum level of the acoustic

pressure at the HATS Reference Point (HRP) in a diffuse sound field with the HATS absent using the reverse nominal

curve given in Table 3 of Recommendation ITU-T P.58 [10]

ear-Drum Reference Point (DRP): point located at the end of the ear canal, corresponding to the ear-drum position

freefield reference point: point located in the free sound field, at least in 1,5 m distance from a sound source radiating

in free air (in case of a head and torso simulator (HATS) in the centre of the artificial head with no artificial head

present)

Head And Torso Simulator (HATS) for telephonometry: manikin extending downward from the top of the head to

the waist, designed to simulate the sound pick-up characteristics and the acoustic diffraction produced by a median

human adult and to reproduce the acoustic field generated by the human mouth

Mouth Reference Point (MRP): point located on axis and 25 mm in front of the lip plane of a mouth simulator

nominal setting of the volume control: when a receive volume control is provided, the setting which is closest to the

nominal RLR of 2 dB

reordering: packet order changes during transfer over the network [i.8], packets arrive out of order at the receiver

(i.e. RTP packets)
ETSI
---------------------- Page: 8 ----------------------
9 Final draft ETSI ES 202 739 V1.8.1 (2020-03)
3.2 Symbols
Void.
3.3 Abbreviations
For the purposes of the present document, the following abbreviati
...

SLOVENSKI STANDARD
SIST ES 202 739 V1.8.1:2020
01-julij-2020
Kakovost prenosa govora in večpredstavnih vsebin (STQ) - Prenosne zahteve za
širokopasovne terminale VoIP (ročne in naglavne) glede na kakovost storitev
(QoS), kot jo dojema uporabnik
Speech and multimedia Transmission Quality (STQ) - Transmission requirements for

wideband VoIP terminals (handset and headset) from a QoS perspective as perceived by

the user
Ta slovenski standard je istoveten z: ETSI ES 202 739 V1.8.1 (2020-05)
ICS:
33.050.01 Telekomunikacijska Telecommunication terminal
terminalska oprema na equipment in general
splošno
SIST ES 202 739 V1.8.1:2020 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST ES 202 739 V1.8.1:2020
---------------------- Page: 2 ----------------------
SIST ES 202 739 V1.8.1:2020
ETSI ES 202 739 V1.8.1 (2020-05)
ETSI STANDARD
Speech and multimedia Transmission Quality (STQ);
Transmission requirements for wideband
VoIP terminals (handset and headset)
from a QoS perspective as perceived by the user
---------------------- Page: 3 ----------------------
SIST ES 202 739 V1.8.1:2020
2 ETSI ES 202 739 V1.8.1 (2020-05)
Reference
RES/STQ-276
Keywords
quality, speech, telephony, terminal, VoIP,
wideband
ETSI
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ETSI
---------------------- Page: 4 ----------------------
SIST ES 202 739 V1.8.1:2020
3 ETSI ES 202 739 V1.8.1 (2020-05)
Contents

Intellectual Property Rights ................................................................................................................................ 5

Foreword ............................................................................................................................................................. 5

Modal verbs terminology .................................................................................................................................... 5

Introduction ........................................................................................................................................................ 5

1 Scope ........................................................................................................................................................ 6

2 References ................................................................................................................................................ 6

2.1 Normative references ......................................................................................................................................... 6

2.2 Informative references ........................................................................................................................................ 7

3 Definition of terms, symbols and abbreviations ....................................................................................... 8

3.1 Terms .................................................................................................................................................................. 8

3.2 Symbols .............................................................................................................................................................. 9

3.3 Abbreviations ..................................................................................................................................................... 9

4 General considerations ........................................................................................................................... 10

4.1 Coding algorithm .............................................................................................................................................. 10

4.2 End-to-end considerations ................................................................................................................................ 10

5 Test equipment ....................................................................................................................................... 10

5.1 IP half channel measurement adaptor ............................................................................................................... 10

5.2 Environmental conditions for tests ................................................................................................................... 10

5.3 Accuracy of measurements and test signal generation ..................................................................................... 11

5.4 Network impairment simulation ....................................................................................................................... 11

5.5 Acoustic environment ....................................................................................................................................... 12

5.6 Influence of terminal delay on measurements .................................................................................................. 12

6 Requirements and associated measurement methodologies ................................................................... 12

6.1 Notes ................................................................................................................................................................ 12

6.2 Test setup.......................................................................................................................................................... 12

6.2.1 General ........................................................................................................................................................ 12

6.2.2 Setup for handsets and headsets .................................................................................................................. 13

6.2.3 Position and calibration of HATS ............................................................................................................... 14

6.2.4 Test signal levels ......................................................................................................................................... 14

6.2.5 Setup of background noise simulation ........................................................................................................ 14

6.2.6 Setup of variable echo path ......................................................................................................................... 14

6.2.7 Setup for testing positionial robustness of handsets ................................................................................... 16

6.3 Coding independent parameters ....................................................................................................................... 17

6.3.1 Send frequency response ............................................................................................................................ 17

6.3.1.1 Send frequency response - nominal position ......................................................................................... 17

6.3.1.2 Send frequency response - positional robustness .................................................................................. 18

6.3.2 Send Loudness Rating (SLR)...................................................................................................................... 18

6.3.2.1 Send Loudness Rating (SLR) - nominal position .................................................................................. 18

6.3.2.2 Send Loudness Rating (SLR) - positional robustness ........................................................................... 19

6.3.3 Mic mute ..................................................................................................................................................... 19

6.3.4 Quality of send AGC (Automatic Gain Control) ........................................................................................ 19

6.3.5 Send distortion ............................................................................................................................................ 19

6.3.6 Out-of-band signals in send direction ......................................................................................................... 20

6.3.7 Send noise ................................................................................................................................................... 21

6.3.8 SideTone Masking Rating STMR (mouth to ear) ....................................................................................... 21

6.3.9 Sidetone delay ............................................................................................................................................. 22

6.3.10 Terminal Coupling Loss (TCL) .................................................................................................................. 22

6.3.11 Stability loss................................................................................................................................................ 23

6.3.12 Receive frequency response ........................................................................................................................ 24

6.3.12.1 Receive frequency response - nominal position .................................................................................... 24

6.3.12.2 Receive frequency response - positional robustness ............................................................................. 27

6.3.13 Receive Loudness Rating (RLR) ................................................................................................................ 27

ETSI
---------------------- Page: 5 ----------------------
SIST ES 202 739 V1.8.1:2020
4 ETSI ES 202 739 V1.8.1 (2020-05)

6.3.13.1 Receive Loudness Rating (RLR) - nominal position ............................................................................ 27

6.3.13.2 Receive Loudness Rating (RLR) - positional robustness ...................................................................... 28

6.3.14 Receive distortion ....................................................................................................................................... 28

6.3.15 Out-of-band signals in receive direction ..................................................................................................... 29

6.3.16 Minimum activation level and sensitivity in receive direction ................................................................... 29

6.3.17 Receive noise .............................................................................................................................................. 29

6.3.18 Automatic level control in receive .............................................................................................................. 30

6.3.19 Double talk performance ............................................................................................................................ 30

6.3.19.1 General .................................................................................................................................................. 30

6.3.19.2 Attenuation range in send direction during double talk A .............................................................. 30

H,S,dt

6.3.19.3 Attenuation range in receive direction during double talk A ......................................................... 31

H,R,dt

6.3.19.4 Detection of echo components during double talk ................................................................................ 32

6.3.19.5 Minimum activation level and sensitivity of double talk detection ....................................................... 33

6.3.20 Switching characteristics ............................................................................................................................ 34

6.3.20.1 Note ....................................................................................................................................................... 34

6.3.20.2 Activation in send direction .................................................................................................................. 34

6.3.20.3 Silence suppression and comfort noise generation ................................................................................ 34

6.3.21 Background noise performance .................................................................................................................. 35

6.3.21.1 Performance in send in the presence of background noise .................................................................... 35

6.3.21.2 Speech quality in the presence of background noise ............................................................................. 35

6.3.21.3 Quality of background noise transmission (with far end speech).......................................................... 36

6.3.21.4 Positional Robustness of Speech Quality in the Presence of Background Noise .................................. 37

6.3.22 Quality of echo cancellation ....................................................................................................................... 37

6.3.22.1 Temporal echo effects ........................................................................................................................... 37

6.3.22.2 Spectral echo attenuation ...................................................................................................................... 38

6.3.22.3 Occurrence of artefacts ......................................................................................................................... 38

6.3.22.4 Variable echo path................................................................................................................................. 38

6.3.23 Variant impairments ................................................................................................................................... 39

6.3.23.1 Clock accuracy send .............................................................................................................................. 39

6.3.23.2 Clock accuracy receive ......................................................................................................................... 39

6.3.23.3 Send packet delay variation................................................................................................................... 40

6.3.24 Send and receive delay - round trip delay ................................................................................................... 40

6.4 Codec specific requirements............................................................................................................................. 42

6.4.1 Objective listening speech quality MOS-LQO in send direction ................................................................ 42

6.4.2 Objective listening speech quality MOS-LQO in receive direction............................................................ 43

6.4.3 Quality of jitter buffer adjustment .............................................................................................................. 45

Annex A (informative): Processing delays in VoIP terminals ............................................................ 47

Annex B (informative): Optimum frequency responses for wideband transmission in receive

direction - underlying subjective experiments ............................................ 50

Annex C (informative): Bibliography ................................................................................................... 52

History .............................................................................................................................................................. 53

ETSI
---------------------- Page: 6 ----------------------
SIST ES 202 739 V1.8.1:2020
5 ETSI ES 202 739 V1.8.1 (2020-05)
Intellectual Property Rights
Essential patents

IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The information

pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found

in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in

respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web

server (https://ipr.etsi.org/).

Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee

can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web

server) which are, or may be, or may become, essential to the present document.
Trademarks

The present document may include trademarks and/or tradenames which are asserted and/or registered by their owners.

ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no

right to use or reproduce any trademark and/or tradename. Mention of those trademarks in the present document does

not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks.

Foreword

This ETSI Standard (ES) has been produced by ETSI Technical Committee Speech and multimedia Transmission

Quality (STQ).
Modal verbs terminology

In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and

"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of

provisions).

"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.

Introduction

Traditionally, analogue and digital telephones were interfacing switched-circuit 64 kbit/s PCM networks. With the fast

growth of IP networks, wideband terminals providing higher audio-bandwidth and directly interfacing packet-switched

networks (VoIP) are being rapidly introduced. Such IP network edge devices may include gateways, specifically

designed IP phones, soft phones or other devices connected to the IP based networks and providing telephony service.

Since the IP networks will be in many cases interworking with the traditional PSTN and private networks, many of the

basic transmission requirements have to be harmonised with specifications for traditional digital terminals. However,

due to the unique characteristics of the IP networks including packet loss, delay, etc., new performance specification, as

well as appropriate measurement methods, will have to be developed. Terminals are getting increasingly complex,

advanced signal processing is used to address the IP specific issues.

The advanced signal processing of terminals is targeted to speech signals. Therefore, wherever possible speech signals

are used for testing in order to achieve mostly realistic test conditions and meaningful results.

The present document provides speech transmission performance requirements for wideband VoIP handset and headset

terminals.

NOTE: Requirement limits are given in tables, the associated curve when provided is given for illustration.

ETSI
---------------------- Page: 7 ----------------------
SIST ES 202 739 V1.8.1:2020
6 ETSI ES 202 739 V1.8.1 (2020-05)
1 Scope

The present document provides speech transmission performance requirements for 8 kHz wideband VoIP handset and

headset terminals; it addresses all types of IP based terminals, including wireless and soft phones.

DECT terminals are covered in ETSI EN 300 175-8 [i.9] and ETSI EN 300 176-2 [i.10].

In contrast to other standards which define minimum performance requirements it is the intention of the present

document to specify terminal equipment requirements which enable manufacturers and service providers to enable good

quality end-to-end speech performance as perceived by the user.

In addition to basic testing procedures, the present document describes advanced testing procedures taking into account

further quality parameters as perceived by the user.
2 References
2.1 Normative references

References are either specific (identified by date of publication and/or edition number or version number) or

non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the

referenced document (including any amendments) applies.

Referenced documents which are not found to be publicly available in the expected location might be found at

https://docbox.etsi.org/Reference.

NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee

their long term validity.

The following referenced documents are necessary for the application of the present document.

[1] Recommendation ITU-T G.107: "The E-model: a computational model for use in transmission

planning".
[2] Recommendation ITU-T G.108: "Application of the E-model: A planning guide".

[3] Recommendation ITU-T G.109: "Definition of categories of speech transmission quality".

[4] Void.
[5] Recommendation ITU-T G.722: "7 kHz audio-coding within 64 kbit/s".

[6] Recommendation ITU-T G.722.1: "Low-complexity coding at 24 and 32 kbit/s for hands-free

operation in systems with low frame loss".

[7] Recommendation ITU-T G.729.1: "G.729-based embedded variable bit-rate coder: An 8-32 kbit/s

scalable wideband coder bitstream interoperable with G.729".
[8] Recommendation ITU-T P.56: "Objective measurement of active speech level".
[9] Recommendation ITU-T P.57: "Artificial ears".
[10] Recommendation ITU-T P.58: "Head and torso simulator for telephonometry".

[11] Recommendation ITU-T P.64: "Determination of sensitivity/frequency characteristics of local

telephone systems".

[12] Recommendation ITU-T P.79: "Calculation of loudness ratings for telephone sets".

[13] Recommendation ITU-T P.340: "Transmission characteristics and speech quality parameters of

hands-free terminals".
[14] Recommendation ITU-T P.380: "Electro-acoustic measurements on headsets".
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[15] Recommendation ITU-T P.501: "Test signals for use in telephonometry".

[16] Recommendation ITU-T P.502: "Objective test methods for speech communication systems using

complex test signals".

[17] Recommendation ITU-T P.581: "Use of head and torso simulator for hands-free and handset

terminal testing".

[18] IEC 61260-1: "Electroacoustics - Octave-band and fractional-octave-band filters - Part 1:

Specifications".

[19] TIA-920.130 Revision B (April 2018): "Telecommunications Communications Products

Transmission Requirements for Digital Interface Communications Devices with Headsets".

[20] ETSI TS 103 224: "Speech and multimedia Transmission Quality (STQ); A sound field

reproduction method for terminal testing including a background noise database".

[21] Recommendation ITU-T P.863: "Perceptual objective listening quality prediction".

[22] Recommendation ITU-T P.863.1: "Application Guide for Recommendation ITU-T P.863".

[23] ETSI ES 202 737: "Speech and multimedia Transmission Quality (STQ); Transmission

requirements for narrowband VoIP terminals (handset and headset) from a QoS perspective as

perceived by the user".

[24] Recommendation ITU-T P.1010: "Fundamental voice transmission objectives for VoIP terminals

and gateways".

[25] Recommendation ITU-T G.722.2: "Wideband coding of speech at around 16 kbit/s using Adaptive

Multi-Rate Wideband (AMR-WB)".
[26] IETF RFC 3550: "RTP: A Transport Protocol for Real-Time Applications".

[27] Recommendation ITU-T G.122: "Influence of national systems on stability and talker echo in

international connections".
[28] Recommendation ITU-T G.107.1: "Wideband E-Model".

[29] Recommendation ITU-T G.711: "Pulse code modulation (PCM) of voice frequencies".

[30] Recommendation ITU-T G.729: "Coding of speech at 8 kbit/s using conjugate-structure algebraic-

code-excited linear prediction (CS-ACELP)".

[31] Recommendation ITU-T G.723.1: "Dual rate speech coder for multimedia communications

transmitting at 5.3 and 6.3 kbit/s".
2.2 Informative references

References are either specific (identified by date of publication and/or edition number or version number) or

non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the

referenced document (including any amendments) applies.

NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee

their long term validity.

The following referenced documents are not necessary for the application of the present document but they assist the

user with regard to a particular subject area.

[i.1] ETSI EG 201 377-1: "Speech and multimedia Transmission Quality (STQ); Specification and

measurement of speech transmission quality; Part 1: Introduction to objective comparison

measurement methods for one-way speech quality across networks".

[i.2] ETSI EG 202 425: "Speech Processing, Transmission and Quality Aspects (STQ); Definition and

implementation of VoIP reference point".
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[i.3] ETSI EG 202 396-3: "Speech and multimedia Transmission Quality (STQ); Speech Quality

performance in the presence of background noise; Part 3: Background noise transmission -

Objective test methods".
[i.4] Recommendation ITU-T P.800.1: "Mean Opinion Score (MOS) Terminology".
[i.5] Netem™.
NOTE: Available at https://wiki.linuxfoundation.org/networking/netem.

[i.6] DAGA 2008: "Testing Wideband Terminals", March 10-13, Dresden, Proceedings. Poschen S.,

Kettler F., Raake A., Spors S.

[i.7] ETSI ES 202 739 (V1.2.1): "Speech Processing, Transmission and Quality Aspects (STQ);

Transmission requirements for wideband VoIP terminals (handset and headset) from a QoS

perspective as perceived by the user".
[i.8] IETF RFC 4737: "Packet Reordering Metrics".

[i.9] ETSI EN 300 175-8: "Digital Enhanced Cordless Telecommunications (DECT); Common

Interface (CI); Part 8: Speech and audio coding and transmission".

[i.10] ETSI EN 300 176-2: "Digital Enhanced Cordless Telecommunications (DECT); Test

specification; Part 2: Audio and speech".
3 Definition of terms, symbols and abbreviations
3.1 Terms
For the purposes of the present document, the following terms apply:

artificial ear: device for the calibration of earphones incorporating an acoustic coupler and a calibrated microphone for

the measurement of the sound pressure and having an overall acoustic impedance similar to that of the median adult

human ear over a given frequency band

codec: combination of an analogue-to-digital encoder and a digital-to-analogue decoder operating in opposite directions

of transmission in the same equipment

diffuse field equalization: equalization of the HATS sound pick-up, equalization of the difference, in dB, between the

spectrum level of the acoustic pressure at the ear-Drum Reference Point (DRP) and the spectrum level of the acoustic

pressure at the HATS Reference Point (HRP) in a diffuse sound field with the HATS absent using the reverse nominal

curve given in Table 3 of Recommendation ITU-T P.58 [10]

ear-Drum Reference Point (DRP): point located at the end of the ear canal, corresponding to the ear-drum position

freefield reference point: point located in the free sound field, at least in 1,5 m distance from a sound source radiating

in free air (in case of a head and torso simulator (HATS) in th
...

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