SIST ES 202 737 V1.7.1:2018

SLOVENSKI STANDARD
SIST ES 202 737 V1.7.1:2018
01-maj-2018
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Speech and multimedia Transmission Quality (STQ) - Transmission requirements for

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

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

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GSM® and the GSM logo are trademarks registered and owned by the GSM Association.

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 Definitions and abbreviations ................................................................................................................... 8

3.1 Definitions .......................................................................................................................................................... 8

3.2 Abbreviations ..................................................................................................................................................... 8

4 General considerations ............................................................................................................................. 9

4.1 Default coding algorithm .................................................................................................................................... 9

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 ................................................................... 13

6.1 Notes ................................................................................................................................................................ 13

6.2 Test setup.......................................................................................................................................................... 13

6.2.1 General ........................................................................................................................................................ 13

6.2.2 Setup for handsets and headsets .................................................................................................................. 14

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

6.2.4 Test signal levels ......................................................................................................................................... 15

6.2.5 Setup of background noise simulation ........................................................................................................ 15

6.2.6 Setup of variable echo path ......................................................................................................................... 15

6.3 Coding independent parameters ....................................................................................................................... 16

6.3.1 Send frequency response ............................................................................................................................ 16

6.3.2 Send Loudness Rating (SLR)...................................................................................................................... 17

6.3.3 Mic mute ..................................................................................................................................................... 17

6.3.4 Linearity range for SLR .............................................................................................................................. 18

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

6.3.6 Out-of-band signals in send direction ......................................................................................................... 19

6.3.7 Send noise ................................................................................................................................................... 20

6.3.8 Sidetone Masking Rating STMR (mouth to ear) ........................................................................................ 20

6.3.9 Sidetone delay ............................................................................................................................................. 21

6.3.10 Terminal Coupling Loss weighted (TCLw) ................................................................................................ 22

6.3.11 Stability loss................................................................................................................................................ 22

6.3.12 Receive frequency response ........................................................................................................................ 23

6.3.13 Receive Loudness Rating (RLR) ................................................................................................................ 26

6.3.14 Receive distortion ....................................................................................................................................... 26

6.3.15 Out-of-band signals in receive direction ..................................................................................................... 27

6.3.16 Minimum activation level and sensitivity in receive direction ................................................................... 27

6.3.17 Receive noise .............................................................................................................................................. 27

6.3.18 Automatic level control in receive .............................................................................................................. 28

6.3.19 Double talk performance ............................................................................................................................ 28

6.3.19.1 General .................................................................................................................................................. 28

6.3.19.2 Attenuation range in send direction during double talk A .............................................................. 28

6.3.19.3 Attenuation range in receive direction during double talk A ......................................................... 29

6.3.19.4 Detection of echo components during double talk ................................................................................ 30

6.3.19.5 Minimum activation level and sensitivity of double talk detection ....................................................... 31

6.3.20 Switching characteristics ............................................................................................................................ 31

6.3.20.1 Note ....................................................................................................................................................... 31

6.3.20.2 Activation in send direction .................................................................................................................. 31

6.3.20.3 Silence suppression and comfort noise generation ................................................................................ 32

6.3.21 Background noise performance .................................................................................................................. 32

6.3.21.1 Performance in send direction in the presence of background noise ..................................................... 32

6.3.21.2 Speech quality in the presence of background noise ............................................................................. 33

6.3.21.3 Quality of background noise transmission (with far end speech).......................................................... 34

6.3.22 Quality of echo cancellation ....................................................................................................................... 34

6.3.22.1 Temporal echo effects ........................................................................................................................... 34

6.3.22.2 Spectral echo attenuation ...................................................................................................................... 35

6.3.22.3 Occurrence of artefacts ......................................................................................................................... 35

6.3.22.4 Variable echo path................................................................................................................................. 35

6.3.23 Variant impairments; network dependant ................................................................................................... 36

6.3.23.1 Clock accuracy send .............................................................................................................................. 36

6.3.23.2 Clock accuracy receive ......................................................................................................................... 36

6.3.23.3 Send packet delay variation................................................................................................................... 37

6.3.24 Send and receive delay - round trip delay ................................................................................................... 37

6.4 Codec specific requirements............................................................................................................................. 39

6.4.1 Objective listening speech quality MOS-LQO in send direction ................................................................ 39

6.4.2 Objective listening quality MOS-LQO in receive direction ....................................................................... 40

6.4.3 Quality of jitter buffer adjustment .............................................................................................................. 41

Annex A (informative): Processing delays in VoIP terminals ............................................................ 43

Annex B (informative): Example IP delay variation ........................................................................... 46

Annex C (informative): Bibliography ................................................................................................... 47

History .............................................................................................................................................................. 48

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

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

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

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

fast growth of IP networks, terminals 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 specifications, as well as appropriate measuring

methods, will have to be developed. Terminals are getting increasingly complex, advanced signal processing is used to

address the IP specific issues. Also, the VoIP terminals may use other than 64 kbit/s PCM (Recommendation ITU-T

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 for narrowband VoIP handset and headset terminals.

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

The present document provides speech transmission performance requirements for 4 kHz narrowband VoIP handset and

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

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

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

It is the intention of the present document to describe terminal performance parameters in such way that the remaining

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

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

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

[1] ETSI EN 300 726: "Digital cellular telecommunications system (Phase 2+) (GSM); Enhanced Full

[2] ETSI TS 126 171: "Digital cellular telecommunications system (Phase 2+); Universal Mobile

Telecommunications System (UMTS); LTE; Speech codec speech processing functions; Adaptive

Multi-Rate - Wideband (AMR-WB) speech codec; General description (3GPP TS 26.171)".

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

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

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

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

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

[9] Recommendation ITU-T G.726: "40, 32, 24, 16 kbit/s Adaptive Differential Pulse Code

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

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

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

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

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

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

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

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

[24] ETSI ES 202 739: "Speech and multimedia Transmission Quality (STQ); Transmission

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

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

[26] Recommendation ITU-T P.863: "Perceptual objective listening quality assessment".

[27] Recommendation ITU-T P.863.1: "Application guide for Recommendation ITU-T P.863".

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

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

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

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

[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

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

[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 -

[i.6] Trace Control for Netem (TCN): A. Keller, "Trace Control for Netem", Semester Thesis

For the purposes of the present document, the following terms and definitions 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

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

Composite Source Signal (CSS): signal composed in time by various signal elements

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

Ear Reference Point (ERP): virtual point for geometric reference located at the entrance to the listener's ear,

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

NOTE: In case of a head and torso simulator (HATS) in the centre of the artificial head with no artificial head

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

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

ITU-T International Telecommunication Union - Telecommunication standardization sector

NOTE: y being N for narrow-band, M for mixed and S for superwideband. See Recommendation ITU-T