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TECHNICAL SPECIFICATION
Speech and multimedia Transmission Quality (STQ);
Transmission requirements for narrowband
wireless terminals (handset and headset)
from a QoS perspective as perceived by the user
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2 ETSI TS 103 737 V1.3.1 (2018-10)
Reference
RTS/STQ-272-1
Keywords
speech, terminal
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3 ETSI TS 103 737 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 . 7
3 Definitions and abbreviations . 8
3.1 Definitions . 8
3.2 Abbreviations . 8
4 Configurations and interfaces . 9
4.0 Introduction . 9
4.1 Access networks . 9
4.2 Additional (radio) links between the terminal and external electroacoustical devices . 9
5 Test Configurations . 10
5.1 Set-up interface . 10
5.2 Set-up for terminals . 10
5.2.0 General . 10
5.2.1 Setup for handsets and headsets . 11
5.2.2 Setup of variable echo path . 11
5.2.3 Setup for testing positionial robustness of handsets . 12
5.3 Acoustical environment . 13
5.4 Test signals . 13
5.5 Calibration . 14
5.6 Environmental conditions for tests . 16
5.7 Accuracy of test equipment . 16
5.8 Power feeding conditions . 16
5.9 Influence of terminal delay on measurements . 16
6 Codec independent requirements and associated Measurement Methodologies . 17
6.1 Send and receive frequency response . 17
6.1.1 Send frequency response . 17
6.1.2 Receive frequency response . 18
6.1.3 Positional Robustness of Frequency Response . 21
6.1.3.1 Send. 21
6.1.3.2 Receive . 21
6.2 Send and receive loudness ratings . 21
6.2.1 Send Loudness Rating (SLR). 21
6.2.2 Microphone (Mic) mute . 22
6.2.3 Receive Loudness Rating (RLR) . 22
6.2.4 Positional Robustness of LR . 23
6.2.4.1 SLR . 23
6.2.4.2 RLR . 23
6.3 Sidetone parameters . 23
6.3.0 Introduction. 23
6.3.1 Sidetone Masking Rating (STMR) . 24
6.3.2 Sidetone delay . 24
6.4 Send and receive noise . 25
6.4.1 Send noise . 25
6.4.2 Receive noise . 25
6.5 Send and receive distortion . 26
6.5.0 Introduction. 26
ETSI
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4 ETSI TS 103 737 V1.3.1 (2018-10)
6.5.1 Send Distortion . 26
6.5.2 Receive distortion . 27
6.6 Stability loss and TCLw . 27
6.6.1 Stability loss. 27
6.6.2 Terminal Coupling Loss weighted (TCLw) . 28
6.7 Double talk performance . 29
6.7.0 Introduction. 29
6.7.1 Attenuation Range in Send Direction during Double Talk A . 29
H,S,dt
6.7.2 Attenuation Range in Receive Direction during Double Talk A . 30
H,R,dt
6.7.3 Detection of echo components during double Talk . 31
6.7.4 Minimum activation level and sensitivity of double talk detection . 32
6.8 Switching parameters . 32
6.8.1 Activation in Send Direction . 32
6.8.2 Minimum activation level and sensitivity in receive direction . 33
6.8.3 Automatic level control . 33
6.8.4 Silence Suppression and Comfort Noise Generation . 33
6.9 Background noise performance . 33
6.9.1 Performance in send direction in the presence of background noise . 33
6.9.2 Speech Quality in the Presence of Background Noise . 34
6.9.3 Quality of Background Noise Transmission (with Far End Speech) . 35
6.9.4 Positional Robustness of Speech Quality in the Presence of Background Noise . 36
6.10 Quality of echo cancellation . 36
6.10.1 Temporal echo effects . 36
6.10.2 Spectral Echo Attenuation . 37
6.10.3 Occurrence of Artifacts . 37
6.11 Send and receive delay - round trip delay . 37
6.12 Void . 39
6.13 Variable echo path . 39
7 Codec dependent requirements and associated Measurement Methodologies . 39
7.1 Speech Coders . 39
7.2 Objective listening speech quality . 40
7.2.0 Introduction. 40
7.2.1 Objective listening speech quality MOS-LQO in send direction . 40
7.2.2 Objective listening quality MOS-LQO in receive direction . 40
7.2.2.1 Jitter- and Error-Free Condition . 40
7.2.2.2 Packet Impairments . 41
Annex A (informative): Bibliography . 44
History . 45
ETSI
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5 ETSI TS 103 737 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 achieve mostly realistic test conditions and meaningful results.
ETSI
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6 ETSI TS 103 737 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 handset and headset functions of
narrow-band 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).
link),
When an additional radio link between the terminal and external electroacoustical devices is used (e.g. Bluetooth
the standard 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 standard 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] Recommendation ITU-T P.50: "Artificial voices".
[2] Recommendation ITU-T P.56: "Objective measurement of active speech level".
[3] Recommendation ITU-T P.57: "Artificial ears".
[4] Recommendation ITU-T P.58: "Head and torso simulator for telephonometry".
[5] Recommendation ITU-T P.64: "Determination of sensitivity/frequency characteristics of local
telephone systems".
[6] Recommendation ITU-T P.79: "Calculation of loudness ratings for telephone sets".
[7] Recommendation ITU-T P.310: "Transmission characteristics for telephone band (300-3400 Hz)
digital telephones".
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7 ETSI TS 103 737 V1.3.1 (2018-10)
[8] Recommendation ITU-T P.340: "Transmission characteristics and speech quality parameters of
hands-free terminals".
[9] Recommendation ITU-T P.380: "Electro-acoustic measurements on headsets".
[10] Recommendation ITU-T P.501 (2012): "Test signals for use in telephonometry".
[11] Recommendation ITU-T P.502: "Objective test methods for speech communication systems using
complex test signals".
[12] Recommendation ITU-T P.581: "Use of head and torso simulator (HATS) for hands-free terminal
testing".
[13] Recommendation ITU-T G.122: "Influence of national systems on stability and talker echo in
international connections".
[14] IEC 61260-1: "Electroacoustics - Octave-band and fractional-octave-band filters. - Part 1:
Specification".
[15] IEC 61672-1: "Electroacoustics - Sound level meters - Part 1: Specifications".
[16] 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)".
[17] 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".
[18] Recommendation ITU-T G.711: "Pulse code modulation (PCM) of voice frequencies".
[19] Recommendation ITU-T G.726: "40, 32, 24, 16 kbit/s Adaptive Differential Pulse Code
Modulation (ADPCM)".
[20] Recommendation ITU-T G.729: "Coding of speech at 8 kbit/s using conjugate-structure
algebraic-code-excited linear prediction (CS-ACELP)".
[21] ETSI TS 146 060: "Digital cellular telecommunications system (Phase 2+); (GSM); Enhanced Full
Rate (EFR) speech transcoding (3GPP TS 46.060)".
[22] ETSI TS 146 010: "Digital cellular telecommunications system (Phase 2+); (GSM); Full rate
speech; Transcoding (3GPP TS 46.010)".
[23] Recommendation ITU-T P.863: "Perceptual objective listening quality prediction".
[24] Recommendation ITU-T P.863.1: "Application Guide for Recommendation ITU-T P.863".
[25] 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".
[26] ETSI TS 103 224: "Speech and multimedia Transmission Quality (STQ); A sound field
reproduction method for terminal testing including a background noise database".
[27] Recommendation ITU-T P.1010: "Fundamental voice transmission objectives for VoIP terminals
and gateways".
[28] ETSI TS 126 441: "Universal Mobile Telecommunications System (UMTS); LTE; EVS Codec
General Overview (3GPP TS 26.441)".
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.
ETSI
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8 ETSI TS 103 737 V1.3.1 (2018-10)
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] 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".
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
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 by applying the reverse
nominal curve of table 3 of Recommendation ITU-T P.58 [4]
echo loss: semi-loop loss averaged with 1/f power weighting over the telephone band, in accordance with
Recommendation ITU-T G.122 [13], clause 4
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
Mouth Reference Point (MRP): measurement point on axis and 25 mm in front of the lip plane of a mouth simulator
nominal setting of the volume control: setting of receive volume control of a device, which obtains a RLR value close
to 2 dB
3.2 Abbreviations
For the purposes of the present document, the following abbreviations apply:
AM-FM Amplitude Modulation - Frequency Modulation
AMR-NB Adaptive Multi-Rate - NarrowBand
CDMA Code Division Multiple Access
CS Composite Source
CSS Composite Source Signal
D D-Value of Terminal
DECT Digital Enhanced Cordless Telecommunications
DRP ear Drum Reference Point
DUT Device Under Test
EC Echo Cancellation
ECRP Earcap reference point
EL Echo Loss
ERP Ear Reference Point
EVS-NB Enhanced Voice Services - NarrowBand
FFT Fast Fourier Transform
G-MOS Global Mean Opinion Score
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9 ETSI TS 103 737 V1.3.1 (2018-10)
G-MOS-LQOn Overall transmission quality narrowband
GSM Global Service for Mobile communication
HATS Head And Torso Simulator
HRP HATS Reference Point
IEC International Electrotechnical Commission
ITU-T International Telecommunications Union - Telecom
LQO Listening Quality Objective
LR Loudness Rating
LTE Long Term Evolution (3GPP)
MOS Mean Opinion Score
MRP Mouth Reference Point
N-MOS Noise Mean Opinion Score
N-MOS-LQOn Transmission quality of the background noise narrowband
OTT Over The Top
PLC Packet Loss Concealment
PN Pink Noise
POI Point Of Interconnect
QoS Quality of Service
RF Radio Frequency
RLR Receive Loudness Rating
SLR Send Loudness Rating
S-MOS Speech Mean Opinion Score
S-MOS-LQOn Transmission quality of the speech narrowband
STD Standard (handset position)
STMR SideTone Masking Rating
TCL Terminal Coupling Loss
TCLw Terminal Coupling Loss (weighted)
TOSQA Telecommunications Objective Speech Quality Assessment
UE User Equipment
UMTS Universal Mobile Telecommunications System
VAD Voice Activity Detection
VoLTE Voice over LTE
WIFI Wireless Fidelity
WIMAX™ Worldwide Interoperability Microwave Access
4 Configurations and interfaces
4.0 Introduction
The present document is intended to be applicable for different wireless access networks and for additional radio links.
4.1 Access networks
The present document applies to any wireless terminal whatever the network access, e.g. GSM, UMTS, VoLTE, DECT,
Bluetooth , WIFI, WIMAX™, CDMA.
4.2 Additional (radio) links between the t
...