ETSI TS 103 739 V1.3.1 (2018-10)

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

RTS/STQ-272-3

General Information

• Status: Published
• Publication Date: 17-Oct-2018
• Technical Committee: STQ - Speech and multimedia Transmission Quality
• Current Stage: 12 - Completion
• Due Date: 18-Oct-2018
• Completion Date: 18-Oct-2018

Standards Content (Sample)

TECHNICAL SPECIFICATION
Speech and multimedia Transmission Quality (STQ);
Transmission requirements for wideband wireless terminals
(handset and headset) from a QoS perspective
as perceived by the user
2 ETSI TS 103 739 V1.3.1 (2018-10)

Reference
RTS/STQ-272-3
Keywords
speech, terminal
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3 ETSI TS 103 739 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 Definition of terms and abbreviations . 8
3.1 Terms . 8
3.2 Abbreviations . 8
4 Configurations and interfaces . 9
4.1 Introduction . 9
4.2 Access networks . 9
4.3 Additional (radio) links between the terminal and external electroacoustical devices . 9
5 Test Configurations . 9
5.1 Set-up interface . 9
5.2 Set-up for terminals . 10
5.2.0 General . 10
5.2.1 Setup for handsets and headsets . 10
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 . 15
5.7 Accuracy of test equipment . 15
5.8 Power feeding conditions . 16
5.9 Influence of terminal delay on measurements . 16
6 Codec independent requirements and associated Measurement Methodologies . 16
6.1 Send and receive frequency response . 16
6.1.1 Send frequency response . 16
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 . 22
6.2.1 Send Loudness Rating (SLR). 22
6.2.2 Microphone (mic) mute . 22
6.2.3 Receive Loudness Rating (RLR) . 23
6.2.4 Positional Robustness of LR . 23
6.2.4.1 SLR . 23
6.2.4.2 RLR . 24
6.3 Sidetone parameters . 24
6.3.1 Introduction. 24
6.3.2 SideTone Masking Rating (STMR) . 24
6.3.3 Sidetone delay . 24
6.4 Send and receive noise . 25
6.4.1 Send noise . 25
6.4.2 Receive noise . 26
6.5 Send and receive distortion . 26
6.5.1 Introduction. 26
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4 ETSI TS 103 739 V1.3.1 (2018-10)
6.5.2 Send Distortion . 27
6.5.3 Receive distortion . 27
6.6 Stability loss . 28
6.7 Terminal Coupling Loss (TCL) . 29
6.8 Double talk performance . 30
6.8.1 Introduction. 30
6.8.2 Attenuation Range in Send Direction during Double Talk A , , . 30
H S dt
6.8.3 Attenuation Range in Receive Direction during Double Talk A , , . 31
H R dt
6.8.4 Detection of echo components during double Talk . 32
6.8.5 Minimum activation level and sensitivity of double talk detection . 33
6.9 Switching parameters . 34
6.9.1 Activation in Send Direction . 34
6.9.2 Minimum activation level and sensitivity in Receive direction . 34
6.9.3 Automatic level control . 34
6.9.4 Silence Suppression and Comfort Noise Generation . 35
6.9.5 Non Linear Processing . 35
6.10 Background noise performance . 35
6.10.1 Performance in send direction in the presence of background noise . 35
6.10.2 Speech Quality in the Presence of Background Noise . 36
6.10.3 Quality of Background Noise Transmission (with Far End Speech) . 36
6.10.4 Positional Robustness of Speech Quality in the Presence of Background Noise . 37
6.11 Quality of echo cancellation . 37
6.11.1 Temporal echo effects . 37
6.11.2 Spectral Echo Attenuation . 38
6.11.3 Occurrence of Artefacts . 38
6.11.4 Variable echo path . 38
6.12 Send and receive delay or round trip delay . 39
6.13 Void . 41
7 Codec dependent requirements and associated Measurement Methodologies . 41
7.1 Speech Coders . 41
7.2 Objective listening Quality in send and receive direction . 41
7.2.0 Introduction. 41
7.2.1 Objective listening speech quality MOS-LQO in send direction . 42
7.2.2 Objective listening quality MOS-LQO in receive direction . 42
7.2.2.1 Jitter- and Error-Free Condition . 42
7.2.2.2 Packet Impairments . 43
Annex A (informative): Bibliography . 45
History . 46

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5 ETSI TS 103 739 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
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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
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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 realistic test conditions and meaningful results.
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6 ETSI TS 103 739 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
wideband wireless terminals.
Differently from 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
environments. 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] Void.
[3] Recommendation ITU-T P.56: "Objective measurement of active speech level".
[4] Recommendation ITU-T P.57: "Artificial ears".
[5] Recommendation ITU-T P.58: "Head and torso simulator for telephonometry".
[6] Recommendation ITU-T P.64: "Determination of sensitivity/frequency characteristics of local
telephone systems".
[7] Recommendation ITU-T P.79: "Calculation of loudness ratings for telephone sets".
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7 ETSI TS 103 739 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 Amendment 1 (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 for hands-free terminal testing".
[13] IEC 61672: "Electroacoustics - Sound Level Meters".
[14] IEC 61260: "Electroacoustics - Octave-band and fractional-octave-band filters".
[15] 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)".
[16] 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".
[17] Recommendation ITU-T G.722: "7 kHz audio-coding within 64 kbit/s".
[18] Recommendation ITU-T G.711.1: "Wideband embedded extension for ITU-T G.711 pulse code
modulation".
[19] Recommendation ITU-T G.722.2: "Wideband coding of speech at around 16 kbit/s using Adaptive
Multi-Rate Wideband (AMR-WB)".
[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.311: "Transmission characteristics for wideband digital handset and
headset telephones".
[22] 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)".
[23] ETSI TS 103 224: "Speech and multimedia Transmission Quality (STQ); A sound field
reproduction method for terminal testing including a background noise database".
[24] Recommendation ITU-T P.1010: "Fundamental voice transmission objectives for VoIP terminals
and gateways".
[25] Recommendation ITU-T P.863: "Perceptual objective listening quality prediction".
[26] Recommendation ITU-T P.863.1: "Application guide for Recommendation ITU-T P.863".
[27] Recommendation ITU-T G.122: "Influence of national systems on stability and talker echo in
international connections".
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.
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8 ETSI TS 103 739 V1.3.1 (2018-10)
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 Definition 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
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 [5]
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: 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:
a.c. alternating current
AM-FM Amplitude Modulation - Frequency Modulation
AMR-WB Adaptive Mode Rate - Wide Band
CDMA Code Division Multiple Access
CS Composite Source
CSS Composite Source Signal
DECT Digital Enhanced Cordless Telecommunications
DRP ear Drum Reference Point
DUT Device Under Test
ECRP EarCap Reference Point
ELR Echo Loudness Rating
ERP Ear Reference Point
EVS Enhanced Voice Services
FFT Fast Fourier Transform
G-MOS-LQOw Overall transmission quality for wideband systems
GSM Global System for Mobile communication (3GPP)
HATS Head And Torso Simulator
HRP HATS Reference Point
LQO Listening Quality Objective
LR Loudness Rating
LTE Long Term Evolution (3GPP)
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9 ETSI TS 103 739 V1.3.1 (2018-10)
MOS Mean Opinion Score
MRP Mouth Reference Point
NLP Non-Linear Processing
N-MOS-LQOw Transmission quality of the background noise for wideband systems
PN Pseudo noise sequence
POI Point Of Interconnect
QoS Quality of Service
RF Radio Frequency
RLR Receive Loudness Rating
RMS Root Mean Square
SLR Send Loudness Rating
S-MOS-LQOw Transmission quality of the speech for wideband systems
STD Standard (handset position)
STMR Side Tone Masking Rating
TCL Terminal Coupling Loss
TOSQA Telecommunications Objective Speech Quality Assessment
UMTS Universal Mobil Telecommunications System
VAD Voice Activity Detection
VoLTE Voice over LTE
WB WideBand
WIFI Wireless fidelity
WIMAX™ Worldwide Interoperability for Microwave ACCess
4 Configurations and interfaces
4.1 Introduction
The present document is intended to be applicable for different wireless access networks and for additional radio links.
4.2 Access networks
The present document applies to any wireless terminal whatever the network access, e.g. GSM, UMTS, VoLTE, DECT, ®
Bluetooth , WIFI, WIMAX™ and CDMA.
4.3 Additional (radio) links between the terminal and external
electroacoustical devices
The whole terminal may include additional (radio) links. The most of the requirements and test methods apply to the
whole terminal. Specific requirements and test methods on additional links are for further study.
5 Test Configurations
5.1 Set-up interface
The generic schematic as defined in figure 5.1-1 is applicable to any wireless link.
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10 ETSI TS 103 739 V1.3.1 (2018-10)
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
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.

Figure 5.1-1: Set-up interface
5.2 Set-up for terminals
5.2.0 General
The acoustical access to terminals is the most realistic simulation of the average subscriber. This can be made by using
HATS (Head And Torso Simulator) with appropriate ear simulation and appropriate means to fix handset and headset
terminals in a realistic and reproducible way to the HATS. HATS is described in Recommendation ITU-T P.58 [5],
appropriate ears are described in Recommendation ITU-T P.57 [4] (type 3.3 and type 3.4 ear), a proper positioning of
handsets under realistic conditions is to be found in Recommendation ITU-T P.64 [6].
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 and acoustically using the HATS.
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-WB [15]: 12,65 kbit/s;
• Recommendation ITU-T G.729.1 [16]: 32 kbit/s;
• EVS [22]: 13,2 kbit/s.
5.2.1 Setup for handsets and headsets
When using a handset telephone the handset is placed in the HATS position as described in Recommendation
ITU-T P.64 [6]. The artificial mouth shall be conform with Recommendation ITU-T P.58 [5]. The artificial ear shall be
conform with Recommendation ITU-T P.57 [4], either type 3.3 or type 3.4 ears shall be used. In case of testing a flat
handset (e.g. smartphone) with artificial ear of:
• Type 3.4, the flat handset position according to annex D.3 of Recommendation ITU-T P.64 [6] shall be used
(A=0°, B=5° and C=0°).
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11 ETSI TS 103 739 V1.3.1 (2018-10)
• Type 3.3, the alternative handset position according to annex E.2 of Recommendation ITU-T P.64 [6] shall be
used with the definition A=0°, B=5° and C=0°. This aligns measurements using artificial ears of type 3.3 and
3.4, where the flat handset position is explicitly specified (annex D.3 of Recommendation ITU-T P.64 [6]).
Unless stated otherwise, the application force of 8 N is used for handset testing. No application force is used for
headset.
Recommendations for positioning headsets are given in Recommendation ITU-T P.380 [9]. If not stated otherwise
headsets shall be placed in their recommended wearing position. Further information about setup and the use of HATS
can be found in Recommendation ITU-T P.380 [9].
Unless stated otherwise if a volume control is provided the setting shall be chosen such that the nominal RLR is met as
close as possible.
5.2.2 Setup of variable echo path
The handset is positioned d = 3 cm above a horizontal hard surface, facing the surface with speaker and microphone.
The surface shall be at least 35 × 35 cm. The handset is fixed like a pendulum with a non-elastic cord 3 cm above the
centre of the horizontal surface, see figure 5.2.2-1. The pivot is 55 ± 1 cm above the hard plate.

side view top view
Figure 5.2.2-1: Positioning of handset under test
The "handset-pendulum" is displaced at least to the edge of the hard surface. The test signal playback shall start with the
release of the displaced handset under test.
For headsets the same measurement arrangement is used as described above. However, it has to be assured that the echo
path (audio path between speaker output and microphone input) changes significantly. If the pendular motion across the
base surface is not producing a sufficient change in echo path, another hard surface perpendicular to the base surface
can be added. The dimension and position of the additional surface should be chosen such that it is positioned within the
echo path when crossed by the pendulous headset but not within the echo path when the headset reaches the turning
point of the pendulous motion. At the lowest point of pendular motion, the headset speaker and microphone should not
exceed a distance of 3 cm from either of the surfaces.
NOTE: Depending on the geometry of the headset (monaural / binaural, microphone integrated into earpiece /
earplug with microphone on short arm / microphone on long arm) a stable pendular motion has to be
established. This may require two cords fixed with respect to the headset's balance point in order to avoid
tumbling motion. Alternatively, the headset may be attached to a fixed radial arm to achieve a stable
pendular motion.
Figure 5.2.2-2 shows an exemplary setup for a binaural headset with long microphone arm and vertical surface to
increase echo path variation by changing the coupling between speaker and microphone during pendular motion.
During one pendular period, the DUT is exposed to four sudden changes in echo path when passing the vertical surface.
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12 ETSI TS 103 739 V1.3.1 (2018-10)

Figure 5.2.2-2: Example for positioning of a headset under test
5.2.3 Setup for testing positionial robustness of handsets
In order to investigate the robustness of certain measurements against non-default positions as described in clause 5.2.1,
three modified positions are defined for the sending and receiving side. Tables 5.2.3-1 and 5.2.3-2 provide a description
of these positions, which are derived from typical user behaviour. Figure 5.2.3-1 illustrates the different axes and
coordinate system. More detailed explanations are provided in Recommendation ITU-T P.64 [6]. All measurements
regarding positioning are only applicable for handset testing.

Figure 5.2.3-1: Schematic overview over positioning coordinate system
Table 5.2.3-1 provides the different angles for the positions in sending direction. With these shifts, distance and
direction between MRP and microphone input of the DUT is varied.
Table 5.2.3-1: Modified test positions for sending direction
Position A [°] ∆B [°] C [°] Comment
name (rotation along Xe) (rotation along Ze) (rotation along Ye)
STD 0 0 0 Standard position at ECRP
UP -14 +5 0 Terminal elevated
DOWN +30 0 0 Terminal lowered
AWAY 0 +18 0 Larger distance to MRP

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13 ETSI TS 103 739 V1.3.1 (2018-10)
NOTE: The standard position at ECRP is given by A = B = C = 0°. As specified in clause 5.2.1, the positioning
angle for "flat handsets" (e.g. smartphones) is set to B = 5°. Thus, only the difference to the angle of B is
provided here, i.e. angles for A and C are absolute values.
Table 5.2.3-2 provides the different angles for the positions in receiving direction. With these shifts, the position of the
loudspeaker relative to the ECRP is varied.
Table 5.2.3-2: Modified test positions for receiving direction
Position name Y [mm] Z [mm] Comment
e e
STD 0 0 Standard position at ECRP
Ye-5 Ze-5 -5 -5 Above ECRP
Ye0 Ze+5 0 +5 Right-below ECRP
Ye+5 Ze-5 +5 -5 Right to ECRP
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, test laboratory, in the case where its test room does not conform to anechoic conditions as
given in Recommendation ITU-T P.311 [21], 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.
Depending on the distance of the transducers from mouth to ear a quiet office room may be sufficient e.g. for handsets
where artificial mouth and artificial ear are located close to the acoustical transducers.
However, for some headsets or handset terminals with smaller dimension an anechoic room will be required.
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.
5.4 Test signals
Modern wireless terminals often deploy nonlinear and time-varying processing. As such terminals are designed for
speech transmission, the most appropriate test signal is real speech. Appropriate test signals (general description) are
defined in Recommendation ITU-T P.501 [10].
More information can be found in the test procedures described below.
For testing the wideband telephony service provided by a terminal the test signal used shall be band limited between
100 Hz and 8 kHz with a bandpass filter providing a minimum of 24 dB/Oct. filter roll off, when feeding into the
receive direction.
The test signal levels are referred to the average level of the test signal band limited in receive direction, averaged over
the complete test sequence unless specified otherwise.
Unless specified otherwise, the test signal level shall be -4,7 dBPa at the MRP.
Unless specified otherwise, the applied test signal level at the digital input shall be -16 dBm0.
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14 ETSI TS 103 739 V1.3.1 (2018-10)
5.5 Calibration
Position and calibration of HATS
All the send and receive characteristics shall be tested with the HATS, it shall be indicated what type of ear was used at
what application force. For handsets if not stated otherwise 8N application force shall be used.
The horizontal positioning of the HATS reference plane shall be guaranteed within ±2º.
The HATS shall be equipped with a type 3.3 or type 3.4 artificial ear for handsets. For binaural headsets two artificial
ears are required. The type 3.3 or type 3.4 artificial ears as specified in Recommendation ITU-T P.57 [4] shall be used.
The artificial ear shall be positioned on HATS according to Recommendation ITU-T P.58 [5].
The exact calibration and equalization can be found in Recommendation ITU-T P.581 [12]. If not stated otherwise, the
HATS shall be diffuse-field equalized. The inverse nominal diffuse field curve as found in table 3 of Recommendation
ITU-T P.58 [5] shall be used.
NOTE: The inverse average diffuse field response characteristics of HATS as found in
Recommendation ITU-T P.58 [5] is used and not the specific one that may be provided by the
manufacturer of the HATS. Instead of using the individual diffuse field correction, the average correction
function is used because, for handset and headset measurements, mostly the artificial ear, ear canal and
ear impedance simulations are effective. The individual diffuse-field correction function of HATS
includes all diffraction and reflection effects of the complete individual HATS which are not effective in
the measurement and potentially would lead to bigger measurement uncertainties than using the average
correction.
Setup of background noise simulation
A setup for simulating realistic background noises in a lab-type environment is described in ETSI TS 103 224 [23].
ETSI TS 103 224 [23] 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 5.5-1.

Figure 5.5-1: Loudspeaker arrangement for background noise simulation
ETSI
15 ETSI TS 103 739 V1.3.1 (2018-10)
The equalization and calibration procedure for the setup is described in detail in ETSI TS 103 224 [23].
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 [23] shall be used.
Table 5.5-1: Noises used for background noise simulation
Name Description Length Handset Levels
Full-size car 130 km/h HATS and microphone array at co-drivers 30 s 1: 68,5 dB 2: 68,3 dB
(FullSizeCar_130) position 3: 68,8 dB 4: 69,5 dB
5: 69,9 dB 6: 70,5 dB
7: 70,8 dB 8: 71,9 dB
Cafeteria (Cafeteria) HATS and microphone array inside a cafeteria 30 s 1: 70,0 dB 2: 70,0 dB
3: 70,1 dB 4: 70,7 dB
5: 70,5 dB 6: 70,8 dB
7: 70,6 dB 8: 71,0 dB
Roadnoise HATS and microphone array 30 s 1: 72,8 dB 2: 71,6 dB
(Roadnoise) standing outside near a road 3: 72,0 dB 4: 72,9 dB
5: 72,2 dB 6: 73,1 dB
7: 73,0 dB 8: 73,8 dB
Pub Noise (Pub) HATS and microphone array in a 30 s 1: 77,2 dB 2: 76,6 dB
pub 3: 75,7 dB 4: 76,0 dB
5: 76,0 dB 6: 76,3 dB
7: 76,0 dB 8: 76,4 dB
Airport departure HATS and microphone array in an airport gate 30 s 1: 77,5 dB 2: 78,3 dB
area 3: 78,7 dB 4: 78,7 dB
5: 78,4 dB 6: 78,8 dB
7: 78,1 dB 8: 78,1 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, the accuracy of measurements made by test equipment shall be better than:
Table 5.7-1: Accuracy of measurements
Item Accuracy
Electrical Signal Level
±0,2 dB for levels ≥ -50 dBV
Electrical Signal Level
±0,4 dB for levels < -50 dBV
Sound pressure
±0,7 dB
Time ±0,2 %
Frequency
±0,2 %
Application force ±2 Newton
Measured maximum frequency
20 kHz
Clock Accuracy
< 2 ppm
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16 ETSI TS 103 739 V1.3.1 (2018-10)
Unless specified otherwise, the accuracy of the signals generated by the test equipment shall be better than:
Table 5.7-2: 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 14 kHz
Electrical excitation levels ±0,4 dBV across the whole frequency range
Frequency generation ±2 % (see note)
Time ±0,2 %
Specified component values ±1 %
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.

The measurements results shall be corrected for
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