ETSI TS 103 740 V1.3.1 (2018-10)

ETSI TS 103 740 V1.3.1 (2018-10)






TECHNICAL SPECIFICATION
Speech and multimedia Transmission Quality (STQ);
Transmission requirements
for wideband wireless terminals (handsfree)
from a QoS perspective as perceived by the user

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2 ETSI TS 103 740 V1.3.1 (2018-10)



Reference
RTS/STQ-272-4
Keywords
speech, terminal

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3 ETSI TS 103 740 V1.3.1 (2018-10)
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 . 8
3 Definitions of terms and abbreviations. 8
3.1 Terms . 8
3.2 Abbreviations . 9
4 Configurations and interfaces . 10
4.0 Introduction . 10
4.1 Access networks . 10
4.2 Additional (radio) links between the terminal and external electroacoustical devices . 10
5 Test Configurations . 10
5.1 Set-up interface . 10
5.2 Set-up for terminals . 11
5.2.0 Introduction. 11
5.2.1 Handheld terminal . 11
5.2.2 Vehicle mounted hands-free . 12
5.2.3 Desktop hands-free terminal . 12
5.2.4 Additional test setup for handsfree function with softphone . 13
5.2.4.0 Introduction . 13
5.2.4.1 Softphone including speakers and microphone . 13
5.2.4.2 Softphone with separate speakers . 14
5.2.5 Test setup for variable echo path . 16
5.3 Acoustical environment . 16
5.4 Test signals . 16
5.5 Calibration and test signal level . 17
5.5.1 Send . 17
5.5.2 Receive . 18
5.5.3 Setup of background noise simulation . 18
5.6 Environmental conditions for tests . 19
5.7 Accuracy of test equipment . 19
5.8 Power feeding conditions . 20
5.9 Influence of terminal delay on measurements . 20
6 Codec independent requirements and associated Measurement Methodologies . 20
6.1 Send and receive frequency response . 20
6.1.1 Send frequency response . 20
6.1.2 Receive frequency response . 21
6.1.2.1 Handheld terminal . 21
6.1.2.2 Void. 23
6.1.2.3 Softphone (computer-based terminals) . 23
6.1.2.4 Desktop Terminal . 23
6.2 Send and receive loudness ratings . 24
6.2.1 Send Loudness Ratings . 24
6.2.2 Microphone (Mic) mute . 24
6.2.3 Receive Loudness Ratings . 24
6.3 Send and receive noise . 25
6.3.1 Send Noise . 25
6.3.2 Receive Noise . 26
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4 ETSI TS 103 740 V1.3.1 (2018-10)
6.4 Send and receive distortion . 27
6.4.0 General . 27
6.4.1 Send distortion . 27
6.4.2 Receive distortion . 28
6.5 Terminal Coupling Loss (TCL) . 28
6.6 Stability Loss (or similar parameters) . 29
6.7 Double talk performance . 30
6.7.0 Introduction. 30
6.7.1 Attenuation Range in Send Direction during Double Talk A , , . 30
H S dt
6.7.2 Attenuation Range in Receive Direction during Double Talk A , , . 31
H R dt
6.7.3 Detection of echo components during double Talk . 32
6.7.4 Minimum activation level and sensitivity of double talk detection . 33
6.8 Switching parameters . 34
6.8.0 Clarification . 34
6.8.1 Activation in Send Direction . 34
6.8.2 Minimum activation level and sensitivity in Receive direction . 34
6.8.3 Automatic level control . 35
6.8.4 Silence Suppression and Comfort Noise Generation . 35
6.9 Background noise performance . 35
6.9.1 Performance in send direction in the presence of background noise . 35
6.9.2 Speech Quality in the Presence of Background Noise . 36
6.9.3 Quality of Background Noise Transmission (with Far End Speech) . 36
6.10 Quality of echo cancellation . 37
6.10.1 Temporal echo effects . 37
6.10.2 Spectral Echo Attenuation . 37
6.10.3 Occurrence of Artefacts . 38
6.10.4 Variable echo path . 38
6.11 Send and receive delay or round trip delay . 39
6.12 Void . 40
7 Codec dependent requirements and associated Measurement Methodologies . 40
7.1 Speech Coders . 40
7.2 Void . 41
7.3 Objective listening Quality in send and receive direction . 41
7.3.0 Introduction. 41
7.3.1 Objective listening speech quality MOS-LQO in send direction . 41
7.3.2 Objective listening quality MOS-LQO in receive direction . 42
7.3.2.1 Jitter- and Error-Free Condition . 42
7.3.2.2 Packet Impairments . 42
Annex A (informative): Bibliography . 45
History . 46

ETSI

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5 ETSI TS 103 740 V1.3.1 (2018-10)
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 Technical Specification (TS) 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
The present document covers wireless speech terminals. It aims to enhance the interoperability and end-to-end quality
with all other types of terminals.
The advanced signal processing of terminals is targeted to speech signals. Therefore, wherever possible speech signals
are used for testing in order to archive mostly realistic test conditions and meaningful results.
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6 ETSI TS 103 740 V1.3.1 (2018-10)
1 Scope
The present document provides speech transmission performance requirements for wireless terminals; it addresses all
types of wireless terminals, including softphones. The present document addresses handsfree function of wideband
wireless 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 whatever be the radio link (terminals may implement
different radio links with the access network).
®
When an additional radio link between the terminal and external electroacoustical devices is used (e.g. Bluetooth link),
the present document will address the overall quality.
In the present document objective measurement methodologies and requirements for wireless speech terminals are
given.
In addition to basic testing procedures, the present document describes advanced testing procedures taking into account
further quality parameters as perceived by the user.
The requirements available in the present document will ensure a high compatibility across access networks with all
types of terminals.
It is the aim to optimize the listening and talking quality, conversational performance, as well as the use in noisy
environment. Related requirements and test methods will be defined in the present document.
For all the functions, the present document will consider the limitations in audio performance due to different form
factors (e.g. size, shape).
Terminals which are not intended to be connected to public networks are outside the scope of the present document.
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] Void.
[2] ETSI TS 103 224: "Speech and multimedia Transmission Quality (STQ); A sound field
reproduction method for terminal testing including a background noise database".
[3] Recommendation ITU-T G.122: "Influence of national systems on stability and talker echo in
international connections".
[4] Recommendation ITU-T G.722: "7 kHz audio-coding within 64 kbit/s".
[5] 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".
[6] Recommendation ITU-T G.131: "Talker echo and its control".
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7 ETSI TS 103 740 V1.3.1 (2018-10)
[7] Recommendation ITU-T P.56: "Objective measurement of active speech level".
[8] Recommendation ITU-T P.58: "Head and torso simulator for telephonometry".
[9] Recommendation ITU-T P.79 (2007): "Calculation of loudness ratings for telephone sets".
[10] Recommendation ITU-T P.340: "Transmission characteristics and speech quality parameters of
hands-free terminals".
[11] Recommendation ITU-T P.341: "Transmission characteristics for wideband digital loudspeaking
and hands-free telephony terminals".
[12] Recommendation ITU-T P.501: "Test signals for use in telephonometry".
[13] Recommendation ITU-T P.502: "Objective test methods for speech communication systems using
complex test signals".
[14] Recommendation ITU-T P.581: "Use of head and torso simulator (HATS) for hands-free and
handset terminal testing".
[15] IEC 61260-1: "Electroacoustics -- Octave-band and fractional-octave-band filters -
Part 1: Specifications".
[16] Recommendation ITU-T G.711.1: "Wideband embedded extension for G.711 pulse code
modulation".
[17] Recommendation ITU-T G.722.2: "Wideband coding of speech at around 16 kbit/s using Adaptive
Multi-Rate Wideband (AMR-WB)".
[18] ETSI TS 126 171 (V6.0.0): "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)".
[19] IEC 61672 (all parts): "Electroacoustics -- Sound level meters".
[20] ETSI TS 103 106: "Speech and multimedia Transmission Quality (STQ); Speech quality
performance in the presence of background noise: Background noise transmission for mobile
terminals-objective test methods".
[21] Recommendation ITU-T P.1110: "Wideband hands-free communication in motor vehicles".
[22] ETSI TS 126 441: "Universal Mobile Telecommunications System (UMTS); LTE; EVS Codec
General Overview".
[23] Recommendation ITU-T P.1010: "Fundamental voice transmission objectives for VoIP terminals
and gateways".
[24] Recommendation ITU-T P.863: "Perceptual objective listening quality prediction".
[25] Recommendation ITU-T P.863.1: "Application guide for Recommendation ITU-T P.863".
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8 ETSI TS 103 740 V1.3.1 (2018-10)
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] Void.
[i.2] 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.3] Recommendation ITU-T P.800.1: "Mean Opinion Score (MOS) terminology".
3 Definitions of terms 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
ear-Drum Reference Point (DRP): point located at the end of the ear canal, corresponding to the ear-drum position
freefield equalization: artificial head equalized 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
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 telephony terminal primarily designed for use by several users which will not be
equipped with a handset.
handsfree telephony terminal: telephony terminal using a loudspeaker associated with an amplifier as a telephone
receiver and which can be used without a handset
HATS Hands-Free Reference Point (HATS HFRP): reference point "n" from Recommendation ITU-T P.58 [8]: "n"
is one of the points numbered from 11 to 17 and defined in table 6a of Recommendation ITU-T P.58 [10] (coordinates
of far field front point)
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
under test.
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
loudspeaking function: function of a handset telephone using a loudspeaker associated with an external amplifier as a
telephone receiver
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9 ETSI TS 103 740 V1.3.1 (2018-10)
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, setting which is closest to the
nominal RLR
NOTE: If no user operable volume control is available, this should be noted in the test report.
softphone: speech communication system based upon a computer
3.2 Abbreviations
For the purposes of the present document, the following abbreviations apply:
a.c. alternative current
A attenuation range in send direction during double talk
H,S,dt
AM-FM Amplitude and Frequency Modulated
AMR-WB Adaptive MultiRate codec - Wideband
CDMA Code Division Multiple Access
CS Composite Source
CSS Composite Source Signal
DECT Digital Enhanced Cordless Telecommunications
DFT Discrete Fourier Transformation
DRP ear Drum Reference Point
DUT Device Under Test
EC Echo Cancellation
EL Echo Loss
EVS Enhanced Voice Services
FFT Fast Fourier Transformation
G-MOS-LQOw Overall transmission quality for wideband systems
GSM Global System for Mobile telecommunication
HATS Head And Torso Simulator
HF Hands-Free
HFRP Hands Free Reference Point
HFT Hands-Free Terminal
IEC International Electrotechnical Commission
ITU-T International Telecommunication Union - Telecommunication standardization sector
LQO Listening Quality Objective
LTE Long Term Evolution (3GPP)
NOTE: See Recommendation ITU-T P.79 [9].
MOS Mean Opinion Score
MRP Mouth Reference Point
NOTE: See Recommendation ITU-T P.800.1 [i.3].
NLP Non Linear Processor
N-MOS-LQOw Transmission quality of the backg
...