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ETSI Standard
Speech and multimedia Transmission Quality (STQ);
Transmission requirements for
wideband VoIP loudspeaking and
handsfree terminals from a
QoS perspective as perceived by the user
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2 ETSI ES 202 740 V1.3.1 (2009-09)
Reference
RES/STQ-00156
Keywords
terminal, handsfree, loudspeaking, VoIP, quality
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© European Telecommunications Standards Institute 2009.
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3 ETSI ES 202 740 V1.3.1 (2009-09)
Contents
Intellectual Property Rights . 6
Foreword . 6
Introduction . 6
1 Scope . 7
2 References . 7
2.1 Normative references . 7
2.2 Informative references . 8
3 Definitions and abbreviations . 9
3.1 Definitions . 9
3.2 Abbreviations . 9
4 General considerations . 10
4.1 Coding Algorithm. 10
4.2 End-to-end considerations . 10
4.3 Parameters to be investigated . 11
4.3.1 Basic parameters . 11
4.3.2 Further Parameters with respect to Speech Processing Devices . 11
5 Test equipment . 11
5.1 IP half channel measurement adaptor . 11
5.2 Environmental conditions for tests . 11
5.3 Accuracy of measurements and test signal generation . 12
5.4 Network impairment simulation . 12
5.5 Acoustic environment . 13
6 Test Setup . 14
6.1 Setup for terminals . 14
6.1.1 Hands-free measurements . 14
6.1.2 Measurements in loudspeaking mode . 20
6.2 Test signal levels . 20
6.2.1 Send . 20
6.2.2 Receive . 21
6.3 Setup of background noise simulation. 21
7 Measurements and Requirements for Basic Parameters . 22
7.1 Coding independent parameters . 22
7.1.1 Send sensitivity/frequency response . 22
7.1.1.1 Requirement . 22
7.1.1.2 Measurement method . 23
7.1.2 Send loudness rating . 23
7.1.2.1 Requirement . 23
7.1.2.2 Measurement method . 24
7.1.3 Send distortion . 24
7.1.3.1 Requirement . 24
7.1.3.2 Measurement method . 24
7.1.4 Out-of-band signals in send direction (informative) . 24
7.1.4.1 Requirement . 24
7.1.4.2 Measurement method . 25
7.1.5 Send noise . 25
7.1.5.1 Requirement . 25
7.1.5.2 Measurement method . 25
7.1.6 Receive Frequency Response . 25
7.1.6.1 Requirement . 25
7.1.6.2 Measurement method . 27
7.1.7 Receive Loudness Rating . 28
ETSI
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4 ETSI ES 202 740 V1.3.1 (2009-09)
7.1.7.1 Requirement . 28
7.1.7.2 Measurement method . 28
7.1.8 Receive distortion . 29
7.1.8.1 Requirement . 29
7.1.8.2 Measurement method . 29
7.1.9 Out-of-band signals in receive direction (informative) . 30
7.1.9.1 Requirement . 30
7.1.9.2 Measurement Method. 30
7.1.10 Receive noise . 30
7.1.10.1 Requirement . 30
7.1.10.2 Measurement method . 30
7.1.11 Terminal Coupling Loss . 31
7.1.11.1 Requirement . 31
7.1.11.2 Measurement method . 31
7.1.12 Stability Loss . 31
7.1.12.1 Requirement . 31
7.1.12.2 Measurement method . 32
7.2 Codec Specific Requirements. 32
7.2.1 Send Delay . 32
7.2.1.1 Requirement . 33
7.2.1.2 Measurement Method. 33
7.2.2 Receive delay . 33
7.2.2.1 Requirements . 34
7.2.2.2 Measurement Method. 34
8 Measurements and Requirements for Parameters with respect to Speech Processing Devices . 35
8.1 Objective Listening Speech Quality MOS-LQOM in Send direction . 35
8.2 Objective Listening Quality MOS-LQOM in Receive direction . 35
8.3 Minimum activation level and sensitivity in Receive direction . 35
8.4 Automatic Level Control in Receive . 35
8.5 Double Talk Performance. 35
8.5.1 Attenuation Range in Send Direction during Double Talk A . 36
H,S,dt
8.5.1.1 Requirement . 36
8.5.1.2 Measurement Method. 36
8.5.2 Attenuation Range in Receive Direction during Double Talk A . 37
H,R,dt
8.5.2.1 Requirement . 37
8.5.2.2 Measurement Method. 37
8.5.3 Detection of Echo Components during Double Talk . 38
8.5.3.1 Requirement . 38
8.5.3.2 Measurement Method. 38
8.5.4 Minimum activation level and sensitivity of double talk detection . 40
8.5.5 Switching characteristics . 40
8.5.5.1 Activation in Send Direction . 40
8.5.5.1.1 Requirements . 40
8.5.5.1.2 Measurement Method . 40
8.5.5.2 Silence Suppression and Comfort Noise Generation . 41
8.5.5.3 Performance in send direction in the presence of background noise . 41
8.5.5.3.1 Requirement . 41
8.5.5.3.2 Measurement Method . 42
8.5.5.4 Speech Quality in the Presence of Background Noise . 42
8.5.5.4.1 Requirement . 42
8.5.5.4.2 Measurement Method . 42
8.5.5.5 Quality of Background Noise Transmission (with Far End Speech) . 43
8.5.5.5.1 Requirements . 43
8.5.5.5.2 Measurement Method . 43
8.5.5.6 Quality of Background Noise Transmission (with Near End Speech) . 43
8.5.5.6.1 Requirements . 43
8.5.5.6.2 Measurement Method . 43
8.5.6 Quality of echo cancellation . 44
8.5.6.1 Temporal echo effects . 44
8.5.6.1.1 Requirements . 44
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5 ETSI ES 202 740 V1.3.1 (2009-09)
8.5.6.1.2 Measurement Method . 44
8.5.6.2 Spectral Echo Attenuation . 44
8.5.6.2.1 Requirements . 44
8.5.6.2.2 Measurement Method . 45
8.5.6.3 Occurrence of Artefacts . 45
8.5.7 Variant Impairments; Network dependant . 45
8.5.7.1 Delay versus Time Send . 45
8.5.7.2 Delay versus Time Receive . 45
8.5.7.3 Quality of Jitter buffer adjustment . 45
Annex A (informative): Processing delays in VoIP terminals . 46
Annex B (informative): Bibliography . 49
History . 50
ETSI
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6 ETSI ES 202 740 V1.3.1 (2009-09)
Intellectual Property Rights
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
server (http://webapp.etsi.org/IPR/home.asp).
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.
Foreword
This ETSI Standard (ES) has been produced by ETSI Technical Committee Speech and multimedia Transmission
Quality (STQ).
Introduction
Traditionally, the 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 harmonized 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.
NOTE: Requirement limits are given in tables, the associated curve when provided is given for illustration.
ETSI
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7 ETSI ES 202 740 V1.3.1 (2009-09)
1 Scope
The present document provides speech transmission performance requirements for 8 kHz wideband VoIP loudspeaking
and hands-free terminals; it addresses all types of IP based terminals, including wireless, softphones and group audio
terminals.
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.
NOTE: The present document does not concern headset terminals.
2 References
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific.
• For a specific reference, subsequent revisions do not apply.
• Non-specific reference may be made only to a complete document or a part thereof and only in the following
cases:
- if it is accepted that it will be possible to use all future changes of the referenced document for the
purposes of the referring document;
- for informative references.
Referenced documents which are not found to be publicly available in the expected location might be found at
http://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.
2.1 Normative references
The following referenced documents are indispensable for the application of the present document. For dated
references, only the edition cited applies. For non-specific references, the latest edition of the referenced document
(including any amendments) applies.
[1] ETSI I-ETS 300 245-6: "Integrated Services Digital Network (ISDN); Technical characteristics of
telephony terminals; Part 6: Wideband (7 kHz), loudspeaking and hands free telephony".
[2] ETSI TS 126 171: "Digital cellular telecommunications system (Phase 2+); Universal Mobile
Telecommunications System (UMTS); AMR speech codec, wideband; General description
(3GPP TS 26.171 version 6.0.0 Release 6)".
[3] ITU-T Recommendation G.108: "Application of the E-model: A planning guide".
[4] ITU-T Recommendation G.109: "Definition of categories of speech transmission quality".
[5] ITU-T Recommendation G.122: "Influence of national systems on stability and talker echo in
international connections".
[6] ITU-T Recommendation G.131: "Talker echo and its control".
[7] ITU-T Recommendation G.711: "Pulse code modulation (PCM) of voice frequencies".
ETSI
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8 ETSI ES 202 740 V1.3.1 (2009-09)
[8] ITU-T Recommendation G.722: "7 kHz audio-coding within 64 kbit/s".
[9] ITU-T Recommendation G.722.1: "Low-complexity coding at 24 and 32 kbit/s for hands-free
operation in systems with low frame loss".
[10] ITU-T Recommendation G.729.1: "G.729 based Embedded Variable bit-rate coder: An 8-32 kbit/s
scalable wideband coder bitstream interoperable with G.729".
[11] ITU-T Recommendation G.1020: "Performance parameter definitions for quality of speech and
other voiceband applications utilizing IP networks".
[12] ITU-T Recommendation P.50: "Artificial voices".
[13] ITU-T Recommendation P.56: "Objective measurement of active speech level".
[14] ITU-T Recommendation P.58: "Head and torso simulator for telephonometry".
[15] ITU-T Recommendation P.79: "Calculation of loudness ratings for telephone sets".
[16] ITU-T Recommendation P.310: "Transmission characteristics for telephone band (300-3400 Hz)
digital telephones".
[17] ITU-T Recommendation P.340: "Transmission characteristics and speech quality parameters of
hands-free terminals".
[18] ITU-T Recommendation P.341: "Transmission characteristics for wideband (150-7000 Hz) digital
hands-free telephony terminals".
[19] ITU-T Recommendation P.501: "Test signals for use in telephonometry".
[20] ITU-T Recommendation P.502: "Objective test methods for speech communication systems using
complex test signals".
[21] ITU-T Recommendation P.581: "Use of head and torso simulator (HATS) for hands-free terminal
testing".
[22] ITU-T Recommendation P.862: "Perceptual evaluation of speech quality (PESQ): An objective
method for end-to-end speech quality assessment of narrow-band telephone networks and speech
codecs".
[23] ISO 3 (1973): "Preferred numbers - Series of preferred numbers".
[24] ITU-T Recommendation P.800.1: "Mean Opinion Score (MOS) terminology".
2.2 Informative references
The following referenced documents are not essential to the use of the present document but they assist the user with
regard to a particular subject area. For non-specific references, the latest version of the referenced document (including
any amendments) applies.
[i.1] ETSI EG 202 396-1: "Speech Processing, Transmission and Quality Aspects (STQ); Speech
quality performance in the presence of background noise; Part 1: Background noise simulation
technique and background noise database".
[i.2] ETSI EG 202 425: "Speech Processing, Transmission and Quality Aspects (STQ); Definition and
implementation of VoIP reference point".
[i.3] ETSI EG 202 396-3: "Speech Processing, Transmission and Quality Aspects (STQ); Speech
quality performance in the presence of background noise; Part 3: Background noise transmission -
objective model".
[i.4] ETSI TR 102 648-1: "Speech Processing, Transmission and Quality Aspects (STQ); Test
Methodologies for ETSI Test Events and Results; Part 1: VoIP Speech Quality Testing".
ETSI
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9 ETSI ES 202 740 V1.3.1 (2009-09)
3 Definitions and abbreviations
3.1 Definitions
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...