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SIST ES 202 738 V1.2.1:2009
01-november-2009
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Speech Processing, Transmission and Quality Aspects (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 V1.2.1 (2007-10)
ICS:
33.050.01 Telekomunikacijska Telecommunication terminal
terminalska oprema na equipment in general
splošno
SIST ES 202 738 V1.2.1:2009 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST ES 202 738 V1.2.1:2009
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SIST ES 202 738 V1.2.1:2009
ETSI ES 202 738 V1.2.1 (2007-10)
ETSI Standard
Speech Processing, Transmission and Quality Aspects (STQ);
Transmission requirements for narrowband VoIP
loudspeaking and handsfree terminals from a
QoS perspective as perceived by the user
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SIST ES 202 738 V1.2.1:2009
2 ETSI ES 202 738 V1.2.1 (2007-10)
Reference
DES/STQ-00103
Keywords
narrowband, terminal, handsfree, loudspeaking,
VoIP, quality
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SIST ES 202 738 V1.2.1:2009
3 ETSI ES 202 738 V1.2.1 (2007-10)
Contents
Intellectual Property Rights.6
Foreword.6
Introduction .6
1 Scope.7
2 References.7
3 Definitions and abbreviations.8
3.1 Definitions.8
3.2 Abbreviations.9
4 General considerations .9
4.1 Default Coding Algorithm.9
4.2 End-to-end considerations.10
4.3 Parameters to be investigated .10
4.3.1 Basic parameters.10
4.3.2 Further Parameters with respect to Speech Processing Devices .10
5 Test equipment.11
5.1 IP half channel measurement adaptor.11
5.2 Network impairment simulation.11
5.3 Acoustic environment.12
6 Test setup.12
6.1 Setup for terminal.13
6.1.1 Hands-free measurements.13
6.1.2 Measurements in loudspeaking mode.17
6.2 Test signal levels .17
6.2.1 Sending.17
6.2.2 Receiving.18
6.3 Setup of background noise simulation.18
7 Measurements and Requirements for Basic Parameters .20
7.1 Coding independent parameters .20
7.1.1 Sending sensitivity/frequency response.20
7.1.1.1 Requirement.20
7.1.1.2 Measurement method.21
7.1.2 Sending loudness rating.21
7.1.2.1 Requirement.21
7.1.2.2 Measurement method.21
7.1.3 Sending distortion.21
7.1.3.1 Requirement.21
7.1.3.2 Measurement method.22
7.1.4 Out-of-band signals in sending direction .22
7.1.4.1 Requirement.22
7.1.4.2 Measurement method.22
7.1.5 Sending noise.23
7.1.5.1 Requirement.23
7.1.5.2 Measurement method.23
7.1.6 Receive sensitivity/frequency response .23
7.1.6.1 Requirement.23
7.1.6.2 Measurement method.25
7.1.7 Receive loudness rating .26
7.1.7.1 Requirement.26
7.1.7.2 Measurement method.26
7.1.8 Receiving distortion.27
7.1.8.1 Requirement.27
ETSI
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SIST ES 202 738 V1.2.1:2009
4 ETSI ES 202 738 V1.2.1 (2007-10)
7.1.8.2 Measurement method.27
7.1.9 Out-of-band signals in receiving direction.28
7.1.9.1 Requirement.28
7.1.9.2 Measurement Method.28
7.1.10 Receiving noise.28
7.1.10.1 Requirement.28
7.1.10.2 Measurement method.28
7.1.11 Terminal Coupling Loss.29
7.1.11.1 Requirement.29
7.1.11.2 Measurement method.29
7.1.12 Stability Loss.29
7.1.12.1 Requirement.29
7.1.12.2 Measurement method.29
7.2 Codec Specific Requirements.30
7.2.1 Send Delay.30
7.2.1.1 Requirement.31
7.2.1.2 Measurement Method.31
7.2.2 Receive delay.31
7.2.2.1 Requirement.32
7.2.2.2 Measurement Method.32
8 Measurements and Requirements for Parameters with respect to Speech Processing Devices .33
8.1 Objective Listening Speech Quality MOS-LQO in Send direction.33
8.2 Objective Listening Quality MOS-LQO in Receive direction .33
8.3 Minimum activation level and sensitivity in Receive direction .33
8.4 Automatic Level Control in Receiving.33
8.5 Double Talk Performance.33
8.5.1 Attenuation Range in Sending Direction during Double Talk A .34
H,S,dt
8.5.1.1 Requirement.34
8.5.1.2 Measurement Method.34
8.5.2 Attenuation Range in Receiving Direction during Double Talk A .35
H,R,dt
8.5.2.1 Requirement.35
8.5.2.2 Measurement Method.35
8.5.3 Detection of Echo Components during Double Talk.36
8.5.3.1 Requirement.36
8.5.3.2 Measurement Method.36
8.5.4 Minimum activation level and sensitivity of double talk detection .37
8.5.5 Switching characteristics.38
8.5.5.1 Activation in Sending Direction.38
8.5.5.1.1 Requirements.38
8.5.5.1.2 Measurement Method.38
8.5.5.2 Silence Suppression and Comfort Noise Generation .39
8.5.5.3 Performance in sending direction in the presence of background noise .39
8.5.5.3.1 Requirement.39
8.5.5.3.2 Measurement Method.39
8.5.5.4 Speech Quality in the Presence of Background Noise .40
8.5.5.5 Quality of Background Noise Transmission (with Far End Speech) .40
8.5.5.5.1 Requirements.40
8.5.5.5.2 Measurement Method.40
8.5.5.6 Quality of Background Noise Transmission (with Near End Speech).40
8.5.5.6.1 Requirement.40
8.5.5.6.2 Measurement Method.40
8.5.6 Quality of echo cancellation .41
8.5.6.1 Temporal echo effects .41
8.5.6.1.1 Requirement.41
8.5.6.1.2 Measurement Method.41
8.5.6.2 Spectral Echo Attenuation.41
8.5.6.2.1 Requirement.41
8.5.6.2.2 Measurement Method.42
8.5.6.3 Occurrence of Artifacts.42
8.5.7 Variant Impairments; Network dependant.42
8.5.7.1 Delay versus Time Send.42
ETSI
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SIST ES 202 738 V1.2.1:2009
5 ETSI ES 202 738 V1.2.1 (2007-10)
8.5.7.2 Delay versus Time Receive.42
8.5.7.3 Quality of Jitter buffer adjustment .42
Annex A (informative): Processing delays in VoIP terminals .43
Annex B (informative): Bibliography.46
History .47
ETSI
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SIST ES 202 738 V1.2.1:2009
6 ETSI ES 202 738 V1.2.1 (2007-10)
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 Processing, Transmission and
Quality Aspects (STQ).
Introduction
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
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. Also, the VoIP terminals may use other than 64 kbit/s PCM (ITU-T Recommendation G.711 [9])
speech algorithms.
The present document will provide speech transmission performance requirements for narrowband VoIP loudspeaking
and hands-free terminals.
Note Requirement limits are given in tables, the associated curve when provided is given for illustration.
ETSI
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SIST ES 202 738 V1.2.1:2009
7 ETSI ES 202 738 V1.2.1 (2007-10)
1 Scope
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
terminals.
The intention of the present document is to specify equipment requirements which enable manufacturers and service
providers to enable good quality end-to-end speech performance.
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
The following documents contain provisions which, through reference in this text, constitute provisions of the present
document.
• 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.
• For a non-specific reference, the latest version applies including subsequent corrigendums and amendments.
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.
[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".
[2] ETSI EG 202 425: "Speech Processing, Transmission and Quality Aspects (STQ); Definition and
implementation of VoIP reference point".
[3] 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
telephony".
[4] 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)".
[5] ITU-T Recommendation G.108: "Application of the E-model: A planning guide".
[6] ITU-T Recommendation G.109: "Definition of categories of speech transmission quality".
[7] ITU-T Recommendation G.122: "Influence of national systems on stability and talker echo in
international connections".
[8] ITU-T Recommendation G.131: "Talker echo and its control".
[9] ITU-T Recommendation G.711: "Pulse code modulation (PCM) of voice frequencies".
[10] ITU-T Recommendation G.723.1: "Dual rate speech coder for multimedia communications
transmitting at 5.3 and 6.3 kbit/s".
ETSI
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SIST ES 202 738 V1.2.1:2009
8 ETSI ES 202 738 V1.2.1 (2007-10)
[11] ITU-T Recommendation G.729: "Coding of speech at 8 kbit/s using conjugate-structure
algebraic-code-excited linear prediction (CS-ACELP)".
[12] ITU-T Recommendation G.1020: "Performance parameter definitions for quality of speech and
other voiceband applications utilizing IP networks".
[13] ITU-T Recommendation O.41: "Psophometer for use on telephone-type circuits".
[14] ITU-T Recommendation P.50: "Artificial voices".
[15] ITU-T Recommendation P.56: "Objective measurement of active speech level".
[16] ITU-T Recommendation P.58: "Head and torso simulator for telephonometry".
[17] ITU-T Recommendation P.79: "Calculation of loudness ratings for telephone sets".
[18] ITU-T Recommendation P.310: "Transmission characteristics for telephone band (300-3400 Hz)
digital telephones".
[19] ITU-T Recommendation P.340: "Transmission characteristics and speech quality parameters of
hands-free terminals".
[20] ITU-T Recommendation P.342: "Transmission characteristics for telephone band (300-3400 Hz)
digital loudspeaking and hands-free telephony terminals".
[21] ITU-T Recommendation P.501: "Test signals for use in telephonometry".
[22] ITU-T Recommendation P.502: "Objective test methods for speech communication systems using
complex test signals".
[23] ITU-T Recommendation P.581: "Use of head and torso simulator (HATS) for hands-free terminal
testing".
[24] 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".
[25] ISO 3 (1973): "Preferred numbers - Series of preferred numbers".
3 Definitions and abbreviations
3.1 Definitions
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
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
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
the frequency response of the artificial head is flat
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 center of the artificial head with no artificial head
present)
group-audio terminal: handsfree terminal primarily designed for use by several users which will not be equipped with
a handset
...