ETSI TS 126 132 V8.3.0 (2015-01)

Universal Mobile Telecommunications System (UMTS); LTE; Speech and video telephony terminal acoustic test specification (3GPP TS 26.132 version 8.3.0 Release 8)

RTS/TSGS-0426132v830

General Information

• Status: Published
• Publication Date: 19-Jan-2015
• Technical Committee: 3GPP SA 4 - Codec
• Current Stage: 12 - Completion
• Due Date: 01-Jan-2015
• Completion Date: 20-Jan-2015

Standards Content (Sample)

TECHNICAL SPECIFICATION
Universal Mobile Telecommunications System (UMTS);
LTE;
Speech and video telephony terminal acoustic test
specification
(3GPP TS 26.132 version 8.3.0 Release 8)

3GPP TS 26.132 version 8.3.0 Release 8 1 ETSI TS 126 132 V8.3.0 (2015-01)

Reference
RTS/TSGS-0426132v830
Keywords
LTE,UMTS
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ETSI
3GPP TS 26.132 version 8.3.0 Release 8 2 ETSI TS 126 132 V8.3.0 (2015-01)
Intellectual Property Rights
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 (http://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.
Foreword
This Technical Specification (TS) has been produced by ETSI 3rd Generation Partnership Project (3GPP).
The present document may refer to technical specifications or reports using their 3GPP identities, UMTS identities or
GSM identities. These should be interpreted as being references to the corresponding ETSI deliverables.
The cross reference between GSM, UMTS, 3GPP and ETSI identities can be found under
http://webapp.etsi.org/key/queryform.asp.
Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "may not", "need", "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.
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3GPP TS 26.132 version 8.3.0 Release 8 3 ETSI TS 126 132 V8.3.0 (2015-01)
Contents
Intellectual Property Rights . 2
Foreword . 2
Modal verbs terminology . 2
Foreword . 6
Introduction . 6
1 Scope . 7
2 References . 7
3 Definitions, symbols and abbreviations . 8
3.1 Definitions . 8
3.2 Abbreviations . 8
4 Interfaces . 9
5 Test configurations . 9
5.1 Setup for terminals . 9
5.1.1 Setup for handset terminals . 10
5.1.2 Setup for headset terminals . 10
5.1.3 Setup for hands-free terminals . 11
5.1.3.1 Vehicle mounted hands-free. 11
5.1.3.2 Desktop mounted hands-free . 12
5.1.3.3 Handheld hands-free . 12
5.1.4 Position and calibration of HATS . 14
5.2 Setup of the electrical interfaces . 14
5.2.1 Codec approach and specification. 14
5.2.2 Direct digital processing approach . 15
5.3 Accuracy of test equipment . 15
5.4 Test signals . 16
5.5 Additional setup for wideband testing . 16
5.5.1 Setup for handsets and headsets . 16
5.5.2 Additional test setup for handsfree function with softphone UE . 17
5.5.2.1 Softphone including speakers and microphone . 18
5.5.2.2 Softphone with separate speakers . 20
6 Test conditions . 23
6.1 Environmental conditions . 23
6.1.1 Handset and headset terminals . 23
6.1.2 Hands-free terminals . 23
6.2 System Simulator conditions . 24
7 Narrow-band telephony transmission performance test methods. 24
7.1 Applicability . 24
7.2 Overall loss/loudness ratings . 24
7.2.1 General . 24
7.2.2 Connections with handset UE . 25
7.2.2.1 Sending Loudness Rating (SLR) . 25
7.2.2.2 Receiving Loudness Rating (RLR) . 25
7.2.3 Connections with Vehicle Mounted & Desk-Top hands-free UE . 25
7.2.3.1 Sending Loudness Rating (SLR) . 25
7.2.3.2 Receiving Loudness Rating (RLR) . 26
7.2.4 Connections with Handheld hands-free UE . 26
7.2.4.1 Sending Loudness Rating (SLR) . 26
7.2.4.2 Receiving Loudness Rating (RLR) . 27
7.2.5 Connections with headset UE . 27
7.3 Idle channel noise (handset and headset UE) . 27
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7.3.1 Sending . 27
7.3.2 Receiving . 27
7.4 Sensitivity/frequency characteristics . 28
7.4.1 Handset UE sending. 28
7.4.2 Handset UE receiving . 28
7.4.3 Vehicle Mounted & Desk-Top hands-free UE sending . 28
7.4.4 Vehicle Mounted & Desk-Top hands-free UE receiving . 29
7.4.5 Hand-Held hands-free UE sending . 29
7.4.6 Hand-Held hands-free UE receiving . 29
7.5 Sidetone characteristics . 29
7.5.1 Connections with Handset UE . 29
7.5.1.1 Connections with Handset UE – LRGP method . 30
7.5.1.2 Connections with Handset UE – HATS method . 30
7.5.2 Headset UE . 30
7.5.3 Hands-free UE (all categories) . 30
7.6 Stability loss . 30
7.7 Acoustic echo control . 31
7.7.1 General . 31
7.7.2 Acoustic echo control in a Hands-free UE . 31
7.7.3 Acoustic echo control in a handset UE . 32
7.7.4 Acoustic echo control in a headset UE . 32
7.8 Distortion . 33
7.8.1 Sending Distortion . 33
7.8.2 Receiving . 34
7.9 Ambient Noise Rejection . 34
8 Wideband telephony transmission performance test methods . 35
8.1 Applicability . 35
8.2 Overall loss/loudness ratings . 35
8.2.1 General . 35
8.2.2 Connections with handset UE . 36
8.2.2.1 Sending Loudness Rating (SLR) . 36
8.2.2.2 Receiving Loudness Rating (RLR) . 36
8.2.3 Connections with Vehicle Mounted & Desktop Mounted hands-free UE . 36
8.2.3.1 Sending Loudness Rating (SLR) . 36
8.2.3.2 Receiving Loudness Rating (RLR) . 37
8.2.4 Connections with Handheld hands-free UE . 37
8.2.4.1 Sending Loudness Rating (SLR) . 37
8.2.4.2 Receiving Loudness Rating (RLR) . 38
8.2.5 Connections with headset UE . 38
8.3 Idle channel noise (handset and headset UE) . 38
8.3.1 Sending . 38
8.3.2 Receiving . 38
8.4 Sensitivity/frequency characteristics . 39
8.4.1 Handset and headset UE sending . 39
8.4.2 Handset and headset UE receiving . 39
8.4.3 Vehicle Mounted & Desktop hands-free UE sending . 39
8.4.4 Vehicle Mounted & Desktop hands-free UE receiving . 40
8.4.5 Hand-Held hands-free UE sending . 40
8.4.6 Hand-Held hands-free UE receiving . 40
8.5 Sidetone characteristics . 40
8.5.1 Connections with Handset UE . 40
8.5.2 Headset UE . 41
8.5.3 Hands-free UE (all categories) . 41
8.5.4 Sidetone delay for handset or headset . 41
8.6 Stability loss . 42
8.7 Acoustic echo control . 42
8.7.1 General . 42
8.7.2 Acoustic echo control in a hands-free UE . 42
8.7.3 Acoustic echo control in a handset UE . 43
8.7.4 Acoustic echo control in a headset UE . 44
8.8 Distortion . 45
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8.8.1 Sending Distortion . 45
8.8.2 Receiving . 45
8.9 Ambient Noise Rejection . 45
Annex A (informative): Change history . 48
History . 49

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3GPP TS 26.132 version 8.3.0 Release 8 6 ETSI TS 126 132 V8.3.0 (2015-01)
Foreword
This Technical Specification has been produced by the 3GPP.
The contents of the present document are subject to continuing work within the TSG and may change following formal
TSG approval. Should the TSG modify the contents of this TS, it will be re-released by the TSG with an identifying
change of release date and an increase in version number as follows:
Version x.y.z
where:
x the first digit:
1 presented to TSG for information;
2 presented to TSG for approval;
3 or greater indicates TSG approved document under change control.
y the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections,
updates, etc.
z the third digit is incremented when editorial only changes have been incorporated in the specification.
Introduction
The present document specifies test methods to allow the minimum performance requirements for the acoustic
characteristics of GSM and 3G terminals when used to provide narrow-band or wideband telephony to be assessed.
The objective for narrow-band services is to reach a quality as close as possible to ITU-T standards for PSTN circuits.
However, due to technical and economic factors, there cannot be full compliance with the general characteristics of
international telephone connections and circuits recommended by the ITU-T.
The performance requirements are specified in TS 26.131; the test methods and considerations are specified in the main
body of the text.
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1 Scope
The present document is applicable to any terminal capable of supporting narrow-band or wideband telephony, either as
a stand-alone service or as the telephony component of a multimedia service. The present document specifies test
methods to allow the minimum performance requirements for the acoustic characteristics of GSM and 3G terminals
when used to provide narrow-band or wideband telephony to be assessed.
2 References
The following documents contain provisions which, through reference in this text, constitute provisions of the present
document.
• References are either specific (identified by date of publication, edition number, version number, etc.) or
non-specific.
• For a specific reference, subsequent revisions do not apply.
• For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including
a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same
Release as the present document.
[1] 3GPP TS 26.131: "Terminal Acoustic Characteristics for Telephony; Requirements".
[2] ITU-T Recommendation B.12 (1988): "Use of the decibel and the neper in
telecommunications".
[3] ITU-T Recommendation G.103 (1998): "Hypothetical reference connections".
[4] ITU-T Recommendation G.111 (1993): "Loudness ratings (LRs) in an international connection".
[5] ITU-T Recommendation G.121 (1993): "Loudness ratings (LRs) of national systems".
[6] ITU-T Recommendation G.122 (1993): "Influence of national systems on stability, talker echo,
and listener echo in international connections".
[7] ITU-T Recommendation G.711 1988): "Pulse code modulation (PCM) of voice frequencies".
[8] ITU-T Recommendation P.11 (1993): "Effect of transmission impairments".
[9] ITU-T Recommendation P.38 (1993): "Transmission characteristics of operator telephone systems
(OTS)".
[10] ITU-T Recommendation P.50 (1993): "Artificial voices".
[11] 3GPP TS 03.58 (Release 1997): "Digital Cellular Telecommunications System (Phase 2+)
Characterization test methods and quality assessment for hands-free mobiles".
[12] IEC Publication 60651: 'Sound Level Meters'.
[13] ITU-T Recommendation P.51 (1996): "Artificial mouth".
[14] ITU-T Recommendation P.57 (2005): "Artificial ears".
[15] ITU-T Recommendation P.58 (1996): "Head and torso simulator for telephonometry."
[16] ITU-T Recommendation P.79 (2007) with Annex A: "Calculation of loudness ratings for
telephone sets."
[17] 3GPP TS 06.77 R99 Minimum Performance Requirements for Noise Suppresser Application to
the AMR Speech Encoder.
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[18] ITU-T Recommendation P.64: "Determination of sensitivity/frequency characteristics of local
telephone systems".
[19] ITU-T Recommendation P.581: "Use of head and torso simulator (HATS) for hands-free terminal
testing".
[20] ITU-T Recommendation P.340: "Transmission characteristics of hands-free telepones".
[21] ITU-T Recommendation G.712: "Transmission performance characteristics of pulse code
modulation channels".
[22] ITU-T Recommendation P.501: "Test signals for use in telephonometry".
[23] ITU-T Recommendation O.41: "Psophometer for use on telephone-type circuits".
[24] ITU-T Recommendation O.131: "Psophometer for use on telephone-type circuits".
[25] ISO 9614: "Acoustics - Determination of sound power levels of noise sources using sound
intensity".
[26] ISO 3745: "Acoustics - Determination of sound power levels of noise sources - Precision methods
for anechoic and semi-anechoic rooms".
[27] ITU-T Recommendation O.132: "Quantizing distortion measuring equipment using a sinusoidal
test signal".
3 Definitions, symbols and abbreviations
3.1 Definitions
For the purposes of the present document the term narrow-band refers to signals sampled at 8 kHz; wideband refers to
signals sampled at 16 kHz.
For the purposes of the present document, the following terms: dB, dBr, dBm0, dBm0p and dBA, shall be interpreted as
defined in ITU-T Recommendation B.12; the term dBPa shall be interpreted as the sound pressure level relative to
1 pascal expressed in dB (0 dBPa is equivalent to 94 dB SPL).
A 3GPP softphone is a telephony system running on a general purpose computer or PDA complying with the 3GPP
terminal acoustic requirements (TS 26.131 and 26.132).
3.2 Abbreviations
For the purposes of the present document, the following abbreviations apply:
ADC Analogue to Digital Converter
DAC Digital to Analogue Converter
DTX Discontinuous Transmission
EEC Electrical Echo Control
EL Echo Loss
ERP Ear Reference Point
HATS Head and Torso Simulator
LSTR Listener Sidetone Rating
LRGP Loudness Rating Guardring Position
MRP Mouth Reference Point
OLR Overall Loudness Rating
PCM Pulse Code Modulation
PDA Personal Digital Assistant
POI Point of Interconnection (with PSTN)
PSTN Public Switched Telephone Network
RLR Receive Loudness Rating
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SLR Send Loudness Rating
STMR Sidetone Masking Rating
SS System Simulator
TX Transmission
UE User Equipment
4 Interfaces
Access to terminals for acoustic testing is always made via the acoustic or air interfaces. The Air Interface is specified
by the GSM 05 or 45 and the 3G 25 series specifications and is required to achieve user equipment (UE)
transportability. Measurements can be made at this point using a system simulator (SS) comprising the appropriate radio
terminal equipment and speech transcoder. The losses and gains introduced by the test speech transcoder will need to be
specified.
The POI with the public switched telephone network (PSTN) is considered to have a relative level of 0 dBr, where
signals will be represented by 8-bit A-law, according to ITU-T Recommendation G.711. Measurements may be made at
this point using a standard send and receive side, as defined in ITU-T Recommendations.
Five classes of acoustic interface are considered in this specification:
- Handset UE including softphone UE used as a handset;
- Headset UE including softphone UE used with headset;
- Vehicle Mounted Hands-free UE including softphone UE mounted in a vehicule;
- Desktop-mounted hands-free UE including softphone UE with external loudspeaker(s) used in handsfree mode;
- Handheld hands-free UE including softphone UE with internal loudspeaker(s) used in handsfree mode.
(See definition of softphone in Clause 3.1)
NOTE: The test setup for a softphone UE shall be derived according to the following rules:
- When using a softphone UE as a handset: the test setup shall correspond to handset mode.
- When using a softphone UE with headset: the test setup shall correspond to headset mode.
- When a softphone UE is mounted in a vehicle: the test setup shall correspond to Vehicle-mounted
handsfree mode.
- When using a softphone UE in handsfree mode:
- When using internal loudspeaker(s), the test setup shall correspond to handheld hands-free.
- When using external loudspeaker(s), the test setup shall correspond to desktop-mounted hands-free.
5 Test configurations
This section describes the test setups for terminal acoustic testing.
NOTE: If the terminal has several mechanical configurations (e.g. sliding design open or closed), all
manufacturer-defined configurations shall be tested.
5.1 Setup for terminals
The general access to terminals is described in Figure 1. The preferred acoustic access to GSM and 3G terminals is the
most realistic simulation of the 'average' subscriber. This can be made by using HATS (head and torso simulator) or
LRGP (Loudness Rating Guardring Position), with appropriate ear simulation and appropriate mountings for handset
terminals in a realistic but reproducible, way to the HATS / LRGP. . Hands-free terminals shall use the HATS or free
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field microphone techniques in a realistic but reproducible way. Headset measurement methods are for further study,
awaiting input from ETSI TC-STQ.
HATS is described in ITU-T Recommendation P.58, appropriate ears are described in ITU-T Recommendation P.57
(type 3.3 and type 3.4 ear), a proper positioning of handsets in realistic conditions is found in ITU-T Recommendation
P.64 , the test setups for various types of hands-free terminals can be found in ITU-T Recommendation P.581.
LRGP is described in ITU-T Recommendation P.64, appropriate ears are described in ITU-T Recommendation P.57
(type 3.2).
The preferred way of testing is the connection of a terminal to the system 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.
5.1.1 Setup for handset terminals
HATS Method : When using a handset telephone the handset is placed in the HATS position as described in ITU-T
Recommendation P.64 . The artificial mouth shall conform with P.58 when HATS is used. The artificial ear shall
conform with Rec. P.57, type 3.3 or type 3.4 ears shall be used.
LRGP Method : When using a handset telephone the handset is placed in the LRGP position as described in ITU-T
Recommendation P.64 . The artificial mouth shall conform with P.51 when LRGP is used. The artificial ear shall
conform with Rec. P.57, type 3.2 ear shall be used. Either the high leak or low leak version may be used.
5.1.2 Setup for headset terminals
For further study.
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Headset
MRP
analogue
processing
ERP
Handset ADC Speech Speech
transcoder transcoder
MRP
4-wire 4-wire
analogue TX TX
processing
DAC
Note 1 Note 1 Note 2
ERP
point of
air interface
Handsfree
interconnect
(POI)
MRP
analogue
processing
ERP
access network and
user equipment (UE)
core network
NOTE 1: Includes DTX functionality.
NOTE 2: Connection to PSTN should include electrical echo control (EEC).

Figure 1: GSM/3G Interfaces for specification and testing of terminal narrow-band acoustic
characteristics
5.1.3 Setup for hands-free terminals
5.1.3.1 Vehicle mounted hands-free
Vehicle mounted hands-free may be measured either in a vehicle or in an anechoic room. For both of these two types of
test environments, the setup will depend on whether HATS or a discrete artificial mouth and discrete microphone are
used as the acoustic test equipment.
For in-vehicle measurements, if HATS test equipment is used, it should be positioned in the car as per ITU-T
Recommendation P. 581. If in-vehicle measurements are made with a discrete microphone and discrete artificial mouth,
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they should be positioned in the car as per Figure 2 and Figure 3, respectively. The artificial mouth should comply with
ITU-T Recommendation P. 51. The microphone should be a pressure-field microphone complying with IEC 60651.
The microphone should preferably be fitted with a random incidence corrector. A vehicle simulator may be used
instead of an actual car. A standard vehicle simulator is described in ETSI 0358 601 (TR101110) Digital Cellular
Telecommunications System (Phase 2+) Charactersation test methods and quality assessment for hands-free mobiles.
The hands-free equipment is mounted in the car as specified by the manufacturer.

Figure 2: Test Configuration for Vehicle mounted hands-free, receiving characteristics, with discrete
measurement microphone
Figure 3: Test Configuration for Vehicle mounted hands-free, sending characteristics, with discrete
P. 51 artificial mouth
Specification testing of vehicle-mounted hands-free equipment in an anechoic room is for further study.
5.1.3.2 Desktop mounted hands-free
For HATS test equipment, definition of hands-free terminals and setup for desktop hands-free terminals can be found
in ITU-T Recommendation P.581. Measurement setup using a free field microphone and a discrete P.51 artificial mouth
for desktop hands-free terminals can be found in ITU-T Recommendation P.340.
5.1.3.3 Handheld hands-free
Either HATS or a free-field microphone with a discrete P. 51 artificial mouth may be used to measure Hand-Held
Hands-free type UE.
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If HATS measurement equipment is used, it should be configured to the Hand-Held Hands-free UE according to Figure
4. The HATS should be positioned so that the HATS Reference Point is at a distance d from the centre point of the
HF
visual display of the Mobile Station. The distance d is specified by the manufacturer. A vertical angle θ may be
HF HF
speicfied by the manufacturer. In case it is not specified the distance d shall be 42 cm and θ shall be 0.
HF HF
NOTE: The nominal distance of 42 cm corresponds to lip plane-HATS reference point distance (12 cm) with an
additional 30 cm giving a realistic figure as a reference usage of handheld terminals.

Figure 4: Configuration of Hand-Held Hands-free UE relative to the HATS
If a free-field microphone with a discrete P. 51 mouth are used, they should be configured to the Hand-Held Hands-free
UE as per Figure 5 for receiving measurements and Figure 6 for sending measurements. The measurement instrument
should be located at a distance d from the centre of the visual display of the Mobile Station. The distance d is
HF HF
specified by the manufacturer.

Figure 5: Configuration of Hand-Held Hands-free UE, free-field microphone for receiving
measurements
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Figure 6: Configuration of Hand-Held Hands-free UE, discrete P. 51 artificial mouth for sending
measurements
5.1.4 Position and calibration of HATS
The horizontal positioning of the HATS reference plane shall be guaranteed within ± 2° for testing hands-free
equipment.
The HATS shall be equipped with either Type 3.3 or 3.4 Artificial Ear. For hands-free measurements the HATS shall
always be equipped with two artificial ears. The pinnas are specified in Recommendation P.57 for Types 3.3 and 3.4
artificial ears. The pinna shall be positioned on HATS according to ITU-T Recommendation P.58 .
The exact calibration and equalization procedures as well as the combination of the two ear signals for the purpose of
measurements can be found in ITU-T Recommendation P.581. For Handheld hands-free UE, the set-up corresponding
to 'portable hands-free' in P. 581 should be used.
5.2 Setup of the electrical interfaces
5.2.1 Codec approach and specification
Codec approach: In this approach, a codec is used to convert the companded digital input/output bit-stream of the
system simulator to the equivalent analogue values. With this approach a system simulator, simulating the radio link to
the terminal under controlled and error free conditions is required. The system simulator has to be equipped with a
high-quality codec whose characteristics are as close as possible to ideal.
Definition of 0 dBr point:
D/A converter - a Digital Test Sequence (DTS) representing the codec equivalent of an analogue sinusoidal signal
whose rms value is 3,14 dB below the maximum full-load capacity of the codec shall generate 0
dBm across a 600 ohm load;
A/D converter - a 0 dBm signal generated from a 600 ohm source shall give the digital test sequence (DTS)
representing the codec equivalent of an analogue sinusoidal signal whose RMS value is 3,14 dB
below the maximum full-load capacity of the codec.
Narrow band telephony testing
For testing a GSM or 3G terminal supporting narrow-band telephony, the system simulator shall use the AMR speech
codec as defined in 3GPP TS 26 series specifications, at the source coding bit rate of 12,2kbit/s. The transcoding from
the output of the AMR speech coding in the system simulator to analogue signals shall be carried out using an ITU-T
G.711 codec performing to ITU-T G.712 (4-wire analogue).
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Wide band telephony testing
For testing a GSM or 3G terminal supporting wide-band telephony, the system simulator shall use the AMR-WB speech
codec as defined in 3GPP TS26 series specifications, at the source coding bit rate of 12.65 kbit/s. The transcoding from
the output of the AMR-WB speech coding in the system simulator to analogue signals shall be carried out using an
ITU-T G.711 codec performing to ITU-T G.712 (4-wire analogue).
5.2.2 Direct digital processing approach
In this approach, the companded digital input/output bit-stream of the terminal connected through the radio link to the
system simulator is operated upon directly. For the purposes of GSM/3G acoustic testing, the direct digital processing
shall use the default speech codec, the AMR speech codec as defined in 3GTS26 series specifications, at it"s highest
source coding bit rate of 12,2kbit/s.
Narrow band telephony testing
For testing a GSM or 3G terminal supporting narrow-band telephony, the system simulator shall use the AMR speech
codec as defined in 3GPP TS 26 series specifications, at the source coding bit rate of 12,2kbit/s.
Wide band telephony testing
For testing a GSM or 3G terminal supporting wide-band telephony, the system simulator shall use the AMR-WB speech
codec as defined in 3GPP TS26 series specifications, at the source coding bit rate of 12.65 kbit/s.
5.3 Accuracy of test equipment
Unless specified otherwise, the accuracy of measurements made by test equipment shall be better than:

Item Accuracy
Electrical Signal Power
±0,2 dB for levels ≥ -50 dBm
Electrical Signal Power
±0,4 dB for levels < -50 dBm
Sound pressure
±0,7 dB
Time
±5 %
Frequency ±0,2 %
ETSI
3GPP TS 26.132 version 8.3.0 Release 8 16 ETSI TS 126 132 V8.3.0 (2015-01)
Unless specified otherwise, the accuracy of the signals generated by the test equipment shall be better than:

Quantity Accuracy
Sound pressure level at MRP ±1 dB for 200 Hz to 4 kHz
±3 dB for 100 Hz to 200 Hz
and 4 kHz to 8 kHz
Electrical excitation levels ±0,4 dB (see note 1)
Frequency generation ±2 % (see note 2)
NOTE 1: Across the whole frequency range.
NOTE 2: When measuring sampled systems, it is advisable to avoid measuring at sub-
multiples of the sampling frequency. There is a tolerance of ±2 % on the
generated frequencies, which may be used to avoid this problem, except for
4 kHz where only the -2 % tolerance may be used.

The measurements results shall be corrected for the measured deviations from the nominal level.
The sound level measurement equipment shall conform to IEC 651 Type 1.
5.4 Test signals
Due to the coding of the speech signals, standard sinusoidal test signals are not applicable for GSM/3G acoustic tests,
appropriate test signals (general description) are defined in ITU-T Recommendation P.50 and P.501. Normative
requirements for the use of test signals from P.501 are for further study. For the time being, if test signals from P.501
are used, a multisine signal is recommended. More information can be found in the test procedures described below.
NOTE: As stated in section 5.2 for narrow-band telephony the AMR speech codec shall be used at the highest
source coding bit rate of 12.2kbit/s for all measurements. Tests at lower bit rates are not covered by 3GPP
TS 26.132. If measurements of loudness ratings are still performed at lower bit rates the use of multisine
signal is not recommended, because the results depend on the selected bit rate.
For testing the narrow-band telephony servic
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