ETSI TS 103 334 V1.1.1 (2018-01)

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

DTS/STQ-240

General Information

• Status: Published
• Publication Date: 11-Jan-2018
• Technical Committee: STQ - Speech and multimedia Transmission Quality
• Current Stage: 12 - Completion
• Due Date: 02-Jan-2018
• Completion Date: 12-Jan-2018

Standards Content (Sample)

ETSI TS 103 334 V1.1.1 (2018-01)






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

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2 ETSI TS 103 334 V1.1.1 (2018-01)



Reference
DTS/STQ-240
Keywords
speech, terminal

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3 ETSI TS 103 334 V1.1.1 (2018-01)
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
4.1 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
5.2.1 Introduction. 10
5.2.2 Wrist-worn terminal . 10
5.2.3 Additional wearable styles . 11
5.3 Acoustical environment . 11
5.4 Test signals . 12
5.5 Calibration and test signal level . 12
5.5.1 Send . 12
5.5.2 Receive . 13
5.5.3 Setup of background noise simulation . 13
5.6 Environmental conditions for tests . 14
5.7 Accuracy of test equipment . 14
5.8 Power feeding conditions . 15
5.9 Influence of terminal delay on measurements . 15
6 Codec independent requirements and associated Measurement Methodologies . 15
6.1 Send and receive frequency response . 15
6.1.1 Send frequency response . 15
6.1.2 Receive frequency response . 16
6.1.2.1 Wrist-worn terminal . 16
6.2 Send and receive loudness ratings . 18
6.2.1 Send Loudness Ratings . 18
6.2.2 Microphone (Mic) mute . 18
6.2.3 Receive Loudness Ratings . 19
6.2.3.1 Wrist-worn terminal . 19
6.3 Send and receive noise . 19
6.3.1 Send Noise . 19
6.3.2 Receive Noise . 20
6.4 Send and receive distortion . 20
6.4.1 Introduction. 20
6.4.2 Send distortion . 20
6.4.3 Receive distortion . 21
6.5 Terminal Coupling Loss . 22
6.5.1 Wrist-worn Terminal . 22
6.6 Stability Loss (or similar parameters) . 22
6.7 Double Talk performance . 23
6.7.1 General . 23
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4 ETSI TS 103 334 V1.1.1 (2018-01)
6.7.2 Attenuation Range in Send Direction during Double Talk . 23
6.7.3 Attenuation Range in Receive Direction during Double Talk . 24
6.7.4 Detection of echo components during Double Talk . 25
6.7.5 Minimum activation level and sensitivity of Double Talk detection . 26
6.8 Switching parameters . 26
6.8.1 Activation in Send Direction . 26
6.8.2 Minimum activation level and sensitivity in Receive direction . 27
6.8.3 Automatic level control . 27
6.8.4 Silence Suppression and Comfort Noise Generation . 27
6.8.5 Non Linear Processing . 27
6.9 Background noise performance . 27
6.9.1 Performance in send direction in the presence of background noise . 27
6.9.2 Speech Quality in the Presence of Background Noise . 28
6.9.3 Quality of Background Noise Transmission (with Far End Speech) . 29
6.10 Quality of echo cancellation . 30
6.10.1 Temporal echo effects . 30
6.10.2 Spectral Echo Attenuation . 30
6.10.3 Occurrence of Artefacts . 31
6.11 Send and receive delay or round trip delay . 31
6.12 Objective listening Quality in send and receive direction . 33
7 Codec dependent requirements and associated Measurement Methodologies . 33
7.1 Speech Coders . 33
7.2 Objective listening Quality in send and receive direction . 33
7.2.1 Objective listening quality MOS-LQO in send direction. 33
7.2.2 Objective listening quality MOS-LQO in receive direction . 34
7.3 Network conditions for electrical-acoustical measurements (speech samples) . 35
8 Requirements and associated Measurement Methodologies (with an additional radio link between
the terminal and external electroacoustical devices) . 35
Annex A (informative): Bibliography . 36
History . 37


ETSI

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5 ETSI TS 103 334 V1.1.1 (2018-01)
Intellectual Property Rights
Essential patents
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 (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 wearable 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 103 334 V1.1.1 (2018-01)
1 Scope
The present document provides speech transmission performance requirements for wireless terminals; it is limited to
wearable terminals, including devices worn on the user's wrist. Headsets are out of scope.
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 standard will address the overall quality.
In the present document objective measurement methodologies and requirements for wireless wearable 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
environments. 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, wearing style and location).
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] 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)".
[2] Recommendation ITU-T G.122: "Influence of national systems on stability and talker echo in
international connections".
[3] Recommendation ITU-T G.711: "Pulse code modulation (PCM) of voice frequencies".
[4] Recommendation ITU-T G.726: "40, 32, 24, 16 kbit/s Adaptive Differential Pulse Code
Modulation (ADPCM)".
[5] Recommendation ITU-T G.729: "Coding of speech at 8 kbit/s using conjugate-structure algebraic-
code-excited linear prediction (CS-ACELP)".
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7 ETSI TS 103 334 V1.1.1 (2018-01)
[6] 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".
[7] Recommendation ITU-T P.56: "Objective measurement of active speech level".
[8] Recommendation ITU-T P.57: "Artificial ears".
[9] Recommendation ITU-T P.58: "Head and torso simulator for telephonometry".
[10] Recommendation ITU-T P.79: "Calculation of loudness ratings for telephone sets".
[11] Recommendation ITU-T P.340: "Transmission characteristics and speech quality parameters of
hands-free terminals".
[12] Recommendation ITU-T P.342: "Transmission characteristics for narrow-band digital
loudspeaking and hands-free telephony terminals".
[13] Recommendation ITU-T P.501: "Test signals for use in telephonometry".
[14] Recommendation ITU-T P.502: "Objective test methods for speech communication systems using
complex test signals".
[15] Recommendation ITU-T P.581: "Use of head and torso simulator (HATS) for hands-free terminal
testing".
[16] Recommendation ITU-T O.41: "Psophometer for use on telephone-type circuits".
[17] IEC 61260: "Electroacoustics - Octave-band and fractional-octave-band filters".
[18] ETSI TS 146 010: "Digital cellular telecommunications system (Phase 2+); Full-rate speech;
Transcoding (3GPP TS 46.010 Release 9)".
[19] ETSI TS 146 060: "Digital cellular telecommunications system (Phase 2+); Enhanced Full Rate
(EFR) speech transcoding (3GPP TS 46.060 Release 9)".
[20] CTIA: "Test Plan for Wireless Device Over-the-Air Performance, V3.7".
NOTE: Available at: https://www.ctia.org/docs/default-source/certification/ctia-test-plan-for-wireless-device-
over-the-air-performance-ver-3-7.pdf?sfvrsn=2.
[21] ETSI TS 103 106 (03-2013) (V1.2.1): "Speech and multimedia Transmission Quality (STQ);
Speech quality performance in the presence of background noise: Background noise transmission
for mobile terminals-objective test methods".
[22] ETSI TS 103 224: "Speech and multimedia Transmission Quality (STQ); A sound field
reproduction method for terminal testing including a background noise database".
[23] Recommendation ITU-T P.863: "Perceptual objective listening quality assessment".
[24] Recommendation ITU-T P.863.1: "Application guide for Recommendation ITU-T P.863".
[25] ETSI TS 126 441 (V12.0.0): "Universal Mobile Telecommunications System (UMTS); LTE; EVS
Codec General Overview (3GPP TS 26.441 version 12.0.0 Release 12)".
[26] Recommendation ITU-T G.722.2: "Wideband coding of speech at around 16 kbit/s using Adaptive
Multi-Rate Wideband (AMR-WB)".
[27] Recommendation ITU-T P.1010: "Fundamental voice transmission objectives for VoIP terminals
and gateways.
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 103 334 V1.1.1 (2018-01)
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] Recommendation ITU-T P.1100: "Narrowband hands-free communication in motor vehicles".
[i.2] IEC 61672 (Edition 1.0): "Electroacoustics - Sound level meters".
[i.3] 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:
NOTE: This may contain additional information.
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
freefield equalization: artificial head is equalized flat in such a way that for frontal sound incidence in anechoic
conditions
handsfree telephony terminal: telephony terminal using a loudspeaker associated with an amplifier as a telephone
receiver and which can be used without a handset
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): 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, the setting which results in a value
of RLR closest to the nominal value of RLR = 2 dB
wearable: speech terminal that is worn on the user's body, typically on the wrist
NOTE: At this time, headsets are not considered in the present document.
3.2 Abbreviations
For the purposes of the present document, the following abbreviations apply:
a.c. alternative current
attenuation range in send direction during double talk
A
H,S,dt
AM-FM Amplitude Modulation – Frequency Modulation
AMR Adaptive Multi-Rate codec
AMR-NB Adaptive Multi Rate Narrowband
AMR-WB Adaptive Multi Rate Wideband
CDMA Code Division Multiple Access
CS Composite Source
CSS Composite Source Signal
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9 ETSI TS 103 334 V1.1.1 (2018-01)
DECT Digital Enhanced Cordless Telecommunications
DFT Discrete Fourier Transform
DRP Drum Reference Point
EL Echo Loss
EVS-NB Enhanced Voice Services Narrowband
FFT Fast Fourier Transform
G-MOS-LQOn Overall transmission quality narrowband
GSM Global System for Mobile communication
HATS Head And Torso Simulator
HF Hands Free
HFRP Hands Free Reference Point
IEC International Electrotechnical Commission
ITU-T International Telecommunication Union - Telecommunication
LTE Long Term Evolution (3GPP)
MOS Mean Opinion Score
MOS-LQO Mean Opinion Score - Listening Quality Objective
MRP Mouth Reference Point
NB Narrow Band
N-MOS-LQOn Transmission quality of the background noise narrowband
OTT Over The Top
Sound Pressure at the Handsfree Reference Point
P
HFRP
PLC Packet Loss Concealment
P Sound Pressure at the Mouth Reference Point
MRP
PN Pseudo random Noise
POI Point Of Interconnect
QoS Quality of Service
RF Radio Frequency
RLR max Receive Loudness Rating corresponding to the maximum setting of the volume control
RLR Receive Loudness Rating
SLR Send Loudness Rating
S-MOS-LQOn Transmission quality of the speech narrowband
TCL Terminal Coupling Loss (weighted)
w
TOSQA Telecom Objective Speech Quality Asssessment
UMTS Universal Mobile Telecommunications System
VoLTE Voice over LTE
WIFI Wireless Fidelity
™
WIMAX Worldwide Interoperability for Microwave ACCess
4 Configurations and interfaces
4.1 Access networks
The present document applies to any wireless terminal whatever the access network, e.g. GSM, UMTS, VoLTE, DECT,
® ™ ™
Bluetooth , WI-FI , WIMAX , CDMA.
4.2 Additional (radio) links between the terminal and external
electroacoustical devices
The present document also applies when an additional radio link exists between the wireless terminal and external
®
electro acoustic devices, e.g. Bluetooth .
ETSI

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10 ETSI TS 103 334 V1.1.1 (2018-01)
5 Test Configurations
5.1 Set-up interface
The generic schematic is applicable to any wireless link.
POI
air interface
(electrical interface)
Hands-free
Speech Speech 4-wire
signal
RF-Interface RF-Interface
Transcoder Transcoder Tx
processing
mobile phone
System Simulator
Hands-Free Terminal
~
~
Test System

Figure 5.1: Set-up interface
NOTE: The "whole" terminal includes all the components from "RF interface" to the transducers and may include
an additional (radio) link. The air interface considered in the figure is not the additional radio link.
5.2 Set-up for terminals
5.2.1 Introduction
For electroacoustical testing, HATS as described in Recommendation ITU-T P.58 [9] shall be used.
The preferred way of testing a terminal is to connect it to a network simulator with exact defined settings and access
points. The test sequences are fed in
...