Degree of Confidentiality / Vertraulichkeitsstufe: C2 _ COMPANY CONFIDENTIAL
Global Test Specification for Terminals for
Performance Measurements
(Performance TST) Acoustical Quality Evaluations of Terminals
VFTST_1.020_Audio Quality_V1.6
Editor / Contributions by:
Thomas Ziolkowsky, Vodafone DE
Pham Quang Nguyen, Vodafone DE
Michael Meyer, Vodafone DE
Punit Sharma, Vodafone GP&S
© Vodafone D2 GmbH 2007
This is a Document of Vodafone D2 GmbH, Disseminating, duplicating, in part or in
whole as changing content whatsoever is one permitted subject to Vodafone D2
GmbHs explicit authorisation. This document was prepared with due diligence.
Nevertheless, its completeness cannot be guaranteed.
Table of Content
1Document Information (4)
1.1Scope (4)
1.2Document History (4)
1.3Acceptance Criteria (6)
2Common Settings and Set Up (6)
2.1General Procedures (6)
2.1.1Test setup / environment (6)
2.1.2Set-up for Handset Terminals (7)
2.1.3Set-up for Handheld Hands-free Terminals (8)
2.1.4Set-up for Headset (8)
2.1.5  2.1.5  Set-up for Vehicle Mounted Hands-free Terminals (9)
2.1.6Set-up for Desktop Operated Hands-free Terminals (10)
2.1.7Calibration and Equalisation of the Test Set-up (10)
2.1.8Settings for the System Simulation (10)
2.1.9Measurements via Real Network (12)
2.2Test Signals and Signal Levels (13)
3Measurement Parameters and Requirements (15)
3.1Preparation (18)
3.2Handset Terminals (18)
3.2.1Delay (18)
3.2.2Loudness Ratings (19)
3.2.3Sensitivity/Frequency Characteristics (21)
3.2.4Listening Speech Quality - TMOS (TOSQA2001) (23)
3.2.5Idle Channel Noise (26)
3.2.6Ambient Noise Rejection (27)
3.2.7Acoustic Echo Control (28)
3.2.8Switching Characteristics (31)
3.2.9Double Talk Performance (33)
3.2.10Background Noise Transmission (39)
3.3Handheld Hands-free Terminals (42)
3.3.1Delay (42)
3.3.2Loudness Ratings (42)
3.3.3Sensitivity/Frequency Characteristics (42)
3.3.4Distortion in Receiving Direction (44)
3.3.5Listening Speech Quality - TMOS (TOSQA2001) (44)
3.3.6Idle Channel Noise (45)
3.3.7Ambient Noise Rejection (46)
3.3.8Acoustic Echo Control (46)
3.3.9Switching Characteristics (48)
3.3.10Double Talk Performance (49)
3.3.11Background Noise Transmission (51)
3.4Headset Terminals (53)
3.5Vehicle Mounted Hands-free Terminals (54)
3.6Informative Measurements: Artificial Bandwidth Extension (54)
3.6.1Receiving Loudness Rating (Wideband) (54)
3.6.2Receiving Frequency Response (Wideband) (54)
3.6.3Listening Speech Quality – Wideband TMOS (TOSQA2001) (55)
3.7Recordings Using Real Speech (56)
3.7.1Recordings in Sending Direction (57)
3.7.2Recordings in Receiving direction (57)
3.8MP3 Player Tests (57)
3.8.1Sound Pressure Level of MP3 Player Headset (acc. to EN 50 332) (58)
3.8.2Receiving Frequency Response for MP3 Player Headsets (59)
3.8.3Idle Channel Noise for MP3 Player Headsets (59)
3.8.4Distortion Tests for MP3 Player Headsets (60)
3.8.5Wideband TMOS for MP3 Player Headsets (61)
4Appendix (62)
4.1Test Result Table (62)
4.2Example of Test Equipment Setup (62)
5Reference (64)
6Abbreviations and Definitions (66)
1 Document Information
1.1 Scope
Scope of the paper is to describe measurement methods for determining terminal audio quality.
This specification defines acoustic test procedures and requirements for mobile handset terminals, headsets and hands-free telephones (handheld speakerphones and vehicle mounted hands-free phones) for quality evaluations in connection with the Vodafone network.
The measurements are conducted with 2G mobiles as well as with 3G mobiles. The measurements are carried out in a simulated GSM and WCDMA network respectively as well as in the real Vodafone D2 GSM and UMTS network respectively. In addition for both types of mobiles tests are conducted using the GSM AMR codec.
In order to reproduce realistic conditions for the users the tests are carried out via the acoustical interface. This guarantees results with high correlation to end to end speech quality assessment. In addition to standard parameters in telephonometry advanced tests are described to cover the subjectively relevant parameters double talk performance and background noise transmission.
All tests are designed for narrow-band signals. Narrow-band signals in this context mean band-limited test signals suitable to determine speech quality in 3.1 kHz bandwidth telephony (in contrast to 7 kHz wideband telephony). Further details are given below in this specification.
(Note1: In general the tests can also be applied for desktop hands-free telephones but the exact definition of specific tests, measurement conditions and procedures is not yet covered by
this specification)
1.2  Document History
Version Date Editor Remarks
Ziolkowsky
Initial draft out of Test description Test
Thomas
headset1.0 15.08.2005
Procedures for Acoustical Quality Evaluations of
Terminals Rel. 3.0
1.1 16.08.2005 Pham Quang Nguyen Editorial Changes
1.2 17.07.2006 Punit Sharma Editorial Changes
1.3 15.06.2007 Pham Quang Nguyen Test changes for handset terminals:
•List of requirements for handset and hands-
free  terminals (overview)
•Delay measurement corrected by equipment
delay and system simulator delay
•Test signal Artificial Voice for long term
analyses (loudness ratings, frequency
responses)
•Standard Test Position (STP) or
Recommended Test Position (RTP) at HATS
•New frequency response tolerance schemes
in receiving direction (informative)
•Extended echo measurements, all tests with
nominal and maximum playback level,
spectral echo attenuation additionally with -5
dB m0 and -25 dB m0, “worst case” results of all
echo tests sets “echo performance”
parameter as “ok” or “not ok”.
•D-value test with realistic café noise, new
requirement. Tests with stationary noise only
informative.
•TMOS requirements in sending and receiving
codec dependant
Added:
-List of requirements (overview) and KPI’s
-List of Test Conditions (Speech Coder)
-Reference to VDA Specification for vehicle
mounted hands-free telephones
-New tests for Handheld hands-free terminals
-New test procedure for acoustic shock
-Informative tests for Artificial bandwidth
extension
1.4 16.04.2008 Pham Quang Nguyen Editorial Changes
1.5 30.06. 2008 Michael Meyer Setup for headsets (chapter
2.1.4)
Update Acoustic Shock Measurements (chapter
3.6)
New tests for mp3 player headsets (chapter 3.9)
Editorial changes
1.6 15.09. 2008 Michael Meyer Update: deletion of  Acoustic Shock
Measurements (chapter 3.6)

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