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)

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

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

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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
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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.

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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.
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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 .
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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 either electrically using a reference codec or using the direct signal processing
approach, or acoustically using ITU-T specified devices.
When a coder with variable bit rate is used for testing terminal electroacoustical parameters, the bit rate giving the best
characteristics or the most commonly used should be selected, e.g.:
• AMR-NB (ETSI TS 126 171 [1]): 12,2 kbit/s;
• Recommendation ITU-T G.729.1 [6]: 32 kbit/s.
5.2.2 Wrist-worn terminal
HATS measurement equipment shall be configured to the wrist-worn UE according to figure 5.2. The HATS should be
positioned so that the HATS Reference Point is at a distance d from the centre point of the visual display of the wrist-
HF
worn terminal. The distance d is specified by the manufacturer. A vertical angle θ may be specified by the
HF HF
manufacturer. In case it is not specified the distance d shall be 32 cm and θ shall be 0.
HF HF
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11 ETSI TS 103 334 V1.1.1 (2018-01)
NOTE: The nominal distance of 32 cm corresponds to lip plane-HATS reference point distance (12 cm) with an
additional 20 cm giving a realistic figure as a reference usage of wrist-worn terminals.
The artificial mouth shall conform to Recommendation ITU-T P.58 [9].
The HATS HFRP shall be adjusted for the distance d If the distance d of 32 cm is used, the HFRP correction
HF
. HF
should be 16,0 dB.
Figure 5.2: Configuration of wrist-worn terminal relative to the HATS
The device under test should be mounted on an artificial arm, with dimensions consistent with those in Appendix Q.5 of
[19]. If the artificial arm is constructed of rigid material, it should be covered with a compliant material. A cloth of
thickness 2 ± 1 mm, or compliant material (Shore-A 25 ± 10) of the same thickness should be used to cover the surface
of the arm in the vicinity of the device under test. The compliant material should be placed between the device and the
arm, and sized so that the material extends at least 1 cm along the arm beyond each side of the device.
The device should be mounted on the arm, on top of the compliant material, so that it can be repositioned intentionally,
but not so tightly that the surface of the arm is deformed or that the device under test cannot be rotated or repositioned.
Wrist-worn devices are often equipped with straps that provide for a discrete range of diameters. One approach is to
select the tightest option and then open by one step to somewhat lessen the tightness of mounting. Devices intended for
users with different sized wrists, e.g. children and adults, can be accommodated by the artificial arm referenced in
Appendix Q.5 of [20].
Note that the configuration and nominal geometric parameters above and in figure 5.2 reflect typical usage. As users
may also operate their devices in other positions, testing in a variety of positions and orientations with respect to the
HATS may be informative.
5.2.3 Additional wearable styles
For future study.
5.3 Acoustical environment
In general different acoustical environments have to be taken into account: either room noise and background noise are
an inherent part of the test environment or room noise and background noise shall be eliminated to such an extent that
their influence on the test results can be neglected.
Unless stated otherwise, measurements shall be conducted under quiet and "anechoic" conditions. Considering this, the
test laboratory, in the case where its test room does not conform to anechoic conditions as given in Recommendation
ITU-T P.342 [12], has to present difference in results for measurements due to its test room. In case where an anechoic
room is not available the test room has to be an acoustically treated room with few reflections and a low noise level.
In cases where real or simulated background noise is used as part of the testing environment, the original background
noise shall not be noticeably influenced by the acoustical properties of the room.
In all cases where the performance of acoustic echo cancellers shall be tested, a realistic room, which represents the
typical user environment for the terminal shall be used.
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12 ETSI TS 103 334 V1.1.1 (2018-01)
5.4 Test signals
Due to the coding of the speech signals, care should be taken when using sinusoidal test signals for some wireless
terminals/networks (e.g. GSM/3G), appropriate test signals (general description) are defined in Recommendation ITU-T
P.501 [13].
Unless stated otherwise the test signal to be used for the measurements shall be the British-English single talk sequence
described in clause 7.3.2 of Recommendation ITU-T P.501 [13]. More information can be found in the test procedures
described below.
For testing the narrow-band telephony service provided by a terminal the test signal used shall be band limited between
100 Hz and 4 kHz with a bandpass filter providing a minimum of 24 dB/Oct. filter roll off, when feeding into the
receive direction.
Unless specified otherwise, the test signal levels are referred to the average level of the (band limited in receive
direction) test signal, averaged over the complete test sequence, unless specified otherwise.
Unless specified otherwise, the test signal level shall be -4,7 dBPa at the MRP, calibrated at the position defined in
clause 5.5.1.
Unless specified otherwise, the applied test signal level at the digital input shall be -16 dBm0.
5.5 Calibration and test signal level
5.5.1 Send
Unless specified otherwise, the test signal level shall be -4,7 dBPa at the MRP.
The various steps for calibration of the artificial mouth of HATS are described in Recommendation ITU-T P.581 [15].
The test setup shall be in conformance with, figure 5.3 but, depending on the type of terminal, the appropriate distance
and level will be used. When using this calibration method, send sensitivity shall be calculated as follows:
S = 20logV − 20logP + Corr− Dcorr
mJ s MRP
where:
• Vs is the measured voltage across the appropriate termination (unless stated otherwise, a 600 Ω termination).
• P is the applied sound pressure at the MRP during the first step of calibration.
MRP
• Corr is 20 log (P /P ) of the used artificial mouth.
MRP HFRP
The value of Corr is the value required to calibrate the artificial mouth to the exact value of Dcorr (e.g. 24 dB for 50 cm
distance):
• Dcorr is the correction to achieve the target sound pressure level at the intended distance (see below).
NOTE: Reason for this procedure of calibration in two steps is to take into account the different variations of
signal with distance by using different implementations of HATS.

Figure 5.3: Calibration at HFRP for HATS
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13 ETSI TS 103 334 V1.1.1 (2018-01)
The distance used for level calibration corresponds to the following values:
• Wrist-worn terminal: 20 cm with -20,7 dBPa, Dcorr = 16 dB
5.5.2 Receive
Unless specified otherwise, the applied test signal level at the digital input shall be -16 dBm0.
For binaural measurements two artificial ears are required. The type 3.3 or type 3.4 artificial ears as specified in
Recommendation ITU-T P.57 [8] shall be used. All measurement values produced by HATS are intended to be free-
field equalized according Recommendation ITU-T P.581 [15].
5.5.3 Setup of background noise simulation
A setup for simulating realistic background noises in a lab-type environment is described in ETSI TS 103 224 [22].
ETSI TS 103 224 [22] contains a description of the recording arrangement for realistic background noises, a description
of the setup for a loudspeaker arrangement suitable to simulate a background noise field in a lab-type environment and a
database of realistic background noises, which can be used for testing the terminal performance with a variety of
different background noises.
The principle loudspeaker setup for the simulation arrangement is shown in figure 5.4.

Figure 5.4: Loudspeaker arrangement for background noise simulation
The equalization and calibration procedure for the setup is described in detail in ETSI TS 103 224 [22].
If not stated otherwise this setup is used in all measurements where background noise simulation is required.
The following noises of ETSI TS 103 224 [22] shall be used.
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14 ETSI TS 103 334 V1.1.1 (2018-01)
Table 5.1: Noises used for background noise simulation
Name Description Length Hands-free Levels
Full-size car 130 km/h HATS and microphone 30 s 1: 69,5 dB 2: 68,6 dB
(FullSizeCar_130) array at co-drivers 3: 68,6 dB 4: 68,7 dB
position 5: 68,8 dB 6: 68,8 dB
7: 69,2 dB 8: 69,7 dB
Cafeteria (Cafeteria) HATS and microphone 30 s 1: 69,0 dB 2: 69,7 dB
array inside a cafeteria 3: 69,6 dB 4: 69,8 dB
5: 69,5 dB 6: 69,5 dB
7: 69,7 dB 8: 70,0 dB
Roadnoise HATS and microphone 30 s 1: 68,6 dB 2: 69,5 dB
(Roadnoise) array standing outside 3: 69,5 dB 4: 69,6 dB
near a road 5: 70,4 dB 6: 70,5 dB
7: 69,5 dB 8: 69,3 dB
Pub Noise (Pub) HATS and microphone 30 s 1: 74,3 dB 2: 74,2 dB
array in a Pub 3: 73,9 dB 4: 73,9 dB
5: 74,7 dB 6: 74,8 dB
7: 73,8 dB 8: 73,6 dB
5.6 Environmental conditions for tests
The following conditions shall apply for the testing environment:
a) Ambient temperature: 15 °C to 35 °C (inclusive);
b) Relative humidity: 5 % to 85 %;
c) Air pressure: 86 kPa to 106 kPa (860 mbar to 1 060 mbar).
5.7 Accuracy of test equipment
Unless specified otherwise in a later subsection, the accuracy of measurements made by test equipment shall be better
than the values listed in table 5.2.
Table 5.2: Accuracy of measurements
Item Accuracy
Electrical Signal Power ±0,2 dB for levels ≥ -50 dBV
Electrical Signal Power
±0,4 dB for levels < -50 dBV
Sound pressure ±0,7 dB
Time
±0,2 %
Frequency
±0,2 %
Measured maximum frequency 20 kHz
Clock accuracy
< 2 ppm
Unless specified otherwise in a later subsection, the accuracy of the signals generated by the test equipment shall be
better than the values listed in table 5.3.
Table 5.3: Accuracy of generated signals
Quantity Accuracy
Sound pressure level at MRP ±3 dB for 100 Hz to 200 Hz
±1 dB for 200 Hz to 4 kHz
±3 dB for 4 kHz to 8 kHz
Electrical excitation levels ±0,4 dB across the whole frequency range
Frequency generation ±2 % (see note)
Time ±0,2 %
NOTE: This tolerance may be used to avoid measurements at critical frequencies, e.g. those due to
sampling and coding operations within the terminal under test.

ETSI
15 ETSI TS 103 334 V1.1.1 (2018-01)
The measurements results shall be corrected for the measured deviations from the nominal level.
The sound level measurement equipment shall conform to IEC 61672 [i.2] Type 1.
5.8 Power feeding conditions
For terminal equipment which is directly powered from the mains supply, all tests shall be carried out within ±5 % of
the rated voltage of that supply. If the equipment is powered by other means and those means are not supplied as part of
the apparatus, all tests shall be carried out within the power supply limit declared by the supplier. If the power supply is
a.c., the test shall be conducted within ±4 % of the rated frequency.
5.9 Influence of terminal delay on measurements
As delay is introduced by the terminal, care shall be taken for all measurements where exact position of the analysis
window is required. It shall be checked that the test is performed on the test signal and not any other signal.
6 Codec independent requirements and associated
Measurement Methodologies
6.1 Send and receive frequency response
6.1.1 Send frequency response
Requirement:
The send sensitivity frequency response from the MRP to the measurement output (digital or analogue output according
measurement system used) shall be within the mask which can be drawn with straight lines between the breaking points
in table 6.1 on a logarithmic (frequency) - linear (dB sensitivity) scale.
Table 6.1: Wrist-worn send sensitivity/frequency response
Frequency (Hz) Upper limit Lower limit
100 -8 -
200 0 -
300 0 -12
1 000 0 -6
2 000 4 -6
3 000 4 -6
3 400 4 -9
4 000 0
NOTE: All sensitivity values are expressed in dB on an arbitrary scale.

ETSI
16 ETSI TS 103 334 V1.1.1 (2018-01)
Lower limit
Send Frequency response Mask
Upper limit
Target curve (informative)
]
B 10
d
[
l
e
v
e
l
e
v
i
t
a
l
e
R
-5
-10
-15
100 Frequency [Hz] 1000 10000
Figure 6.1: Wrist-worn send sensitivity/frequency response
Measurement method:
The terminal will be positioned as described in clause 5.2.
The test signal to be used for the measurements shall be the British-English single talk sequence described in
clause 7.3.2 of Recommendation ITU-T P.501 [13]. The spectrum of acoustic signal produced by the artificial mouth is
calibrated under free field conditions at the MRP. The signal level is adjusted according to clause 5.5.
The spectrum at the MRP and the actual level at the MRP (measured in third octaves) are used as reference to determine
the send sensitivity SmJ needed to compute SLR.
Measurements shall be made at one third-octave intervals as given by the R.40 series of preferred numbers in
IEC 61260 [17] for frequencies from 100 Hz to 4 kHz inclusive. For the calculation the averaged measured level at each
frequency band is referred to the averaged test signal level measured in each frequency band.
The sensitivity is expressed in terms of dBV/Pa.
6.1.2 Receive frequency response
6.1.2.1 Wrist-worn terminal
Requirement:
The receive sensitivity frequency response from the measurement input (digital or analogue input according
measurement system used) to ear of HATS free field corrected shall be within the mask which can be drawn with
straight lines between the breaking points in table 6.2 on a logarithmic (frequency) - linear (dB sensitivity) scale.
ETSI
Relative Level [dB]
17 ETSI TS 103 334 V1.1.1 (2018-01)
Table 6.2: Wrist-worn terminal receive sensitivity/frequency response
Frequency (Hz) Upper limit Lower limit
200 6
250 6
315 6
400 6
500 6 -9
630 6 -6
800 6 -6
1 000 6 -6
1 300 6 -6
1 600 6 -6
2 000 6 -6
2 500 6 -6
3 100 6 -6
4 000 6 - ∞
NOTE: All sensitivity values are expressed in dB on an arbitrary scale.

Upper limit
Wrist-worn terminal receive response curve
Lower limit
Target curve (informative)
]
B
d
[
l
e
v
e
l
e
v
i
t
a
l
e
R
-5
-10
-15
Frequency [Hz]
100 1000 10000
Figure 6.2: Wrist-worn receive sensitivity/frequency response
Measurement method:
The terminal will be positioned as described in clause 5.2.
Measurement is operated at nominal value of volume control.
Receive frequency respon
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