SIST ES 202 738 V1.5.1:2017

SLOVENSKI STANDARD
SIST ES 202 738 V1.5.1:2017
01-marec-2017
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Speech and multimedia Transmission Quality (STQ) - Transmission requirements for
narrowband VoIP loudspeaking and handsfree terminals from a QoS perspective as
perceived by the user
Ta slovenski standard je istoveten z: ETSI ES 202 738 V1.5.1 (2017-01)
ICS:
33.050.01 Telekomunikacijska Telecommunication terminal
terminalska oprema na equipment in general
splošno
SIST ES 202 738 V1.5.1:2017 en

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

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

GSM® and the GSM logo are Trade Marks 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 ..................................................................................................................................................... 9

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

4.1 Default 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 ................................................................... 13

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

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

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

6.2.2 Setup for terminal ....................................................................................................................................... 14

6.2.2.1 Hands-free measurements ..................................................................................................................... 14

6.2.2.2 Measurements in loudspeaking mode ................................................................................................... 18

6.2.3 Test signal levels ......................................................................................................................................... 18

6.2.3.1 Send....................................................................................................................................................... 18

6.2.3.2 Receive .................................................................................................................................................. 19

6.2.4 Setup of background noise simulation ........................................................................................................ 19

6.3 Coding independent parameters ....................................................................................................................... 20

6.3.1 Send frequency response ............................................................................................................................ 20

6.3.2 Send Loudness Rating (SLR)...................................................................................................................... 21

6.3.3 Mic mute ..................................................................................................................................................... 21

6.3.4 Send distortion ............................................................................................................................................ 21

6.3.5 Out-of-band signals in send direction ......................................................................................................... 22

6.3.6 Send noise ................................................................................................................................................... 23

6.3.7 Terminal Coupling Loss weighted (TCLw) ................................................................................................ 23

6.3.8 Stability loss................................................................................................................................................ 23

6.3.9 Receive frequency response ........................................................................................................................ 24

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

6.3.11 Receive Distortion ...................................................................................................................................... 27

6.3.12 Out-of-band signals in receive direction ..................................................................................................... 28

6.3.13 Receive noise .............................................................................................................................................. 28

6.3.14 Double talk performance ............................................................................................................................ 29

6.3.14.1 General .................................................................................................................................................. 29

6.3.14.2 Attenuation range in send direction during double talk A .......................................................... 29

6.3.14.3 Attenuation range in receive direction during double talk A ...................................................... 30

6.3.14.4 Detection of echo components during double talk ................................................................................ 31

6.3.14.5 Minimum activation level and sensitivity of double talk detection ....................................................... 32

6.3.15 Switching characteristics ............................................................................................................................ 32

6.3.15.1 Note ....................................................................................................................................................... 32

6.3.15.2 Activation in send direction .................................................................................................................. 32

6.3.15.3 Silence suppression and comfort noise generation ................................................................................ 33

6.3.16 Background noise performance .................................................................................................................. 33

6.3.16.1 Performance in send direction in the presence of background noise ..................................................... 33

6.3.16.2 Speech quality in the presence of background noise ............................................................................. 34

6.3.16.3 Quality of background noise transmission (with far end speech).......................................................... 35

6.3.17 Quality of echo cancellation ....................................................................................................................... 35

6.3.17.1 Temporal echo effects ........................................................................................................................... 35

6.3.17.2 Spectral echo attenuation ...................................................................................................................... 36

6.3.17.3 Occurrence of artefacts ......................................................................................................................... 37

6.3.17.4 Variable echo path................................................................................................................................. 37

6.3.18 Variant impairments; network dependant ................................................................................................... 38

6.3.18.1 Clock accuracy send .............................................................................................................................. 38

6.3.18.2 Clock accuracy receive ......................................................................................................................... 38

6.3.18.3 Send delay variation .............................................................................................................................. 38

6.3.19 Send and receive delay - round trip delay ................................................................................................... 39

6.4 Codec specific requirements............................................................................................................................. 41

6.4.1 Objective listening speech quality MOS-LQO in send direction ................................................................ 41

6.4.2 Objective listening quality MOS-LQO in receive direction ....................................................................... 42

6.4.3 Quality of jitter buffer adjustment .............................................................................................................. 43

Annex A (informative): Processing delays in VoIP terminals ............................................................ 46

Annex B (informative): Bibliography ................................................................................................... 49

History .............................................................................................................................................................. 50

IPRs essential or potentially essential to the present document 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

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

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 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 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 G.711 [7])

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 narrowband VoIP loudspeaking and

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

The present document will provide speech transmission performance requirements for narrowband VoIP loudspeaking

and hands-free terminals; it addresses all types of IP based terminals, including wireless, softphones and group audio

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

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 I-ETS 300 245-3: "Integrated Services Digital Network (ISDN); Technical characteristics of

telephony terminals; Part 3: Pulse Code Modulation (PCM) A-law, loudspeaking and handsfree

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

[3] 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)".

[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 algebraic-

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

[12] Recommendation ITU-T O.41: "Psophometer for use on telephone-type circuits".

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

[17] Recommendation ITU-T P.310: "Transmission characteristics for narrow-band digital handset and

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

[19] Recommendation ITU-T P.342: "Transmission characteristics for narrow-band digital

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

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

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

[25] ETSI ES 202 396-1: "Speech and multimedia Transmission Quality (STQ); Speech quality

performance in the presence of background noise; Part 1: Background noise simulation technique

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

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

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

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

[29] 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 202 425: "Speech Processing, Transmission and Quality Aspects (STQ); Definition and

[i.2] 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.5] ETSI EG 201 377-1: "Speech and multimedia Transmission Quality (STQ); Specification and

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

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

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

freefield equalization: artificial head is equalized in such a way that for frontal sound incidence in anechoic conditions

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

group audio terminal: handsfree terminal primarily designed for use by several users which will not be equipped with

handsfree telephony terminal: telephony terminal using a loudspeaker associated with an amplifier as a telephone

HATS Hands-Free Reference Point (HATS HFRP): corresponds to a reference point "n" from Recommendation

ITU-T P.58 [15]: "n" is one of the points numbered from 11 to 17 and defined in table 6a of Recommendation ITU-T

NOTE: The HATS HFRP depends on the location(s) of the microphones of the terminal under test: the

appropriate axis lip-ring/HATS HFRP is to be as close as possible to the axis lip-ring/HFT microphone

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

loudspeaking function: function of a handset telephone using a loudspeaker associated with an amplifier as a

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: setting which is closest to the nominal RLR

ITU-T International Telecommunication Union - Telecommunication standardization sector

NOTE: y being N for narrow-band, W for wideband, M for mixed and S for superwideband. See

NIST Net Network Simulation Tool from National Institute of Standards and Technology