ETSI I-ETS 300 302-4 ed.1 (1996-09)

Integrated Services Digital Network (ISDN); Videotelephony teleservice; Part 4: Audio aspects - wideband coding and loudspeaking or handsfree function

DI/TE-04008.4

Digitalno omrežje z integriranimi storitvami (ISDN) – Daljinske storitve: videotelefonija – 4. del: Zvokovni vidiki – Širokopasovno kodiranje in funkcija zvočniškega ali prostoročnega terminala

General Information

• Status: Published
• Publication Date: 10-Sep-1996
• Technical Committee: TE 4 - Audiovisual and Voice Terminals
• Current Stage: 12 - Completion
• Due Date: 13-Sep-1996
• Completion Date: 11-Sep-1996
• Ref Project: SIST I-ETS 300 302-4 E1:2003 - Integrated Services Digital Network (ISDN); Videotelephony teleservice; Part 4: Audio aspects - wideband coding and loudspeaking or handsfree function

Standards Content (Sample)

SLOVENSKI STANDARD
SIST I-ETS 300 302-4 E1:2003
01-december-2003
'LJLWDOQRRPUHåMH]LQWHJULUDQLPLVWRULWYDPL,6'1±'DOMLQVNHVWRULWYH
YLGHRWHOHIRQLMD±GHO=YRNRYQLYLGLNL±âLURNRSDVRYQRNRGLUDQMHLQIXQNFLMD
]YRþQLãNHJDDOLSURVWRURþQHJDWHUPLQDOD
Integrated Services Digital Network (ISDN); Videotelephony teleservice; Part 4: Audio
aspects - wideband coding and loudspeaking or handsfree function
Ta slovenski standard je istoveten z: I-ETS 300 302-4 Edition 1
ICS:
33.080 Digitalno omrežje z Integrated Services Digital
integriranimi storitvami Network (ISDN)
(ISDN)
SIST I-ETS 300 302-4 E1:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST I-ETS 300 302-4 E1:2003

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SIST I-ETS 300 302-4 E1:2003
INTERIM
EUROPEAN I-ETS 300 302-4
TELECOMMUNICATION September 1996
STANDARD
Source: ETSI TC-TE Reference: DI/TE-04008.4
ICS: 33.080
Key words: ISDN, videotelephony terminals, audio, handsfree, loudspeaking, wideband, 7 kHz
Integrated Services Digital Network (ISDN);
Videotelephony teleservice;
Part 4: Audio aspects - wideband coding and
loudspeaking or handsfree function
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
Postal address: F-06921 Sophia Antipolis CEDEX - FRANCE
Office address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
X.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: [e-mail]
Tel.: [phone] - Fax: [phone]
Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and the
foregoing restriction extend to reproduction in all media.
© European Telecommunications Standards Institute 1996. All rights reserved.

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I-ETS 300 302-4: September 1996
Whilst every care has been taken in the preparation and publication of this document, errors in content,
typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to
"ETSI Editing and Committee Support Dept." at the address shown on the title page.

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I-ETS 300 302-4: September 1996
Contents
Foreword .5
1 Scope .7
2 Normative references.7
3 Definitions and abbreviations .8
3.1 Definitions .8
3.2 Abbreviations .9
4 Requirements.9
4.1 General .9
4.1.1 Encoding .9
4.1.2 Standard user's position.9
4.1.2.1 "Compact" terminal.9
4.1.2.2 Terminal with separated acoustic front end.9
4.1.3 Volume control .10
4.1.4 Test considerations .10
4.2 Sensitivity - frequency response .10
4.3 Sending and Receiving Loudness Ratings .10
4.4 Volume control range.10
4.5 Terminal Coupling Loss .10
4.5.1 Weighted Terminal Coupling Loss .10
4.5.2 Stability.10
4.6 Distortion.10
4.6.1 Sending distortion.10
4.6.2 Receiving distortion .11
4.7 Out of band signals.11
4.8 Noise.11
4.8.1 Sending .11
4.8.2 Receiving.12
4.8.2.1 A-Weighted noise .12
4.9 Delay.12
4.10 Lip synchronisation .12
4.11 Switching characteristics.12
Annex A (informative): Bibliography.13
History.14

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I-ETS 300 302-4: September 1996
Foreword
Part 4 of this Interim European Telecommunication Standard (I-ETS) has been produced by the Terminal
Equipment (TE) Technical Committee of the European Telecommunications Standards Institute (ETSI).
An ETSI standard may be given I-ETS status either because it is regarded as a provisional solution ahead
of a more advanced standard, or because it is immature and requires a "trial period". The life of an I-ETS
is limited to three years after which it can be converted into an ETS, have it's life extended for a further
two years, be replaced by a new version, or be withdrawn.
This I-ETS is part 4 of a multipart standard covering "Integrated Services Digital Network (ISDN);
Videotelephony teleservice", as described below:
Part 1: "Electroacoustic characteristics for handset telephony function when using Pulse Code
Modulation encoding".
Part 2: "Audio aspects - Pulse Code Modulation (PCM) A-law loudspeaking and handsfree".
Part 3: "Audio aspects - wideband handset".
Part 4: "Audio aspects - wideband coding and loudspeaking or handsfree function".
Proposed announcement date
Date of adoption of this I-ETS: 23 August 1996
Date of latest announcement of this I-ETS (doa): 31 December 1996

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I-ETS 300 302-4: September 1996
1 Scope
This Interim European Telecommunication Standard (I-ETS) specifies the electroacoustic characteristics
for 7 kHz bandwidth loudspeaking and handsfree functions implemented in videotelephony terminals
intended for use in the videotelephone teleservice in the Integrated Services Digital Network (ISDN) using
Adaptive Differential Pulse Code Modulation (ADPCM) encoding according to
CCITT Recommendation G.722 (see annex A). Those terminals will be connected to the basic access of
the coincident S and T reference point of the ISDN.
The videotelephony teleservice in the ISDN is described in ETS 300 264 (see annex A).
The requirements of this I-ETS specify those characteristics which deviate from those of an ISDN 7 kHz
telephony terminal. Those deviations are due to conditions which are special for videotelephony
applications (e.g. delay, measurement position). The corresponding requirements for an ISDN 7 kHz
telephony loudspeaking and handsfree terminal can be found in I-ETS 300 245-6 [1].
2 Normative references
This I-ETS incorporates by dated and undated reference, provisions from other publications. These
normative references are cited at the appropriate places in the text and the publications are listed
hereafter. For dated references, subsequent amendments to or revisions of any of these publications
apply to this I-ETS only when incorporated in it by amendment or revision. For undated references the
latest edition of the publication referred to applies.
[1] ETS 300 245-6: "Integrated Services Digital Network (ISDN); Technical
characteristics for telephony terminals; Part 6: Wideband (7 kHz) loudspeaking
and handsfree telephony".
[2] ETS 300 145 (Second edition): "Integrated Services Digital Network (ISDN);
Audiovisual services; Videotelephone systems and terminal equipment
operating on one or two 64 kbit/s channels".
[3] I-ETS 300 245-5: "Integrated Services Digital Network (ISDN); Technical
characteristics of telephony terminals; Part 5: Wideband (7 kHz) handset
telephony".
[4] I-ETS 300 245-3: "Integrated Services Digital Network (ISDN); Technical
characteristics of telephony terminals; Part 3: Pulse Code Modulation (PCM)
A-law, loudspeaking and handsfree telephony".
[5] Draft prI-ETS 300 302-3: "Integrated Services Digital Network (ISDN);
Videotelephony teleservice; Part 3: Audio aspects - wideband handset".
[6] CCITT Recommendation G.711 (1990): "Pulse code modulation (PCM) of voice
frequencies".

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3 Definitions and abbreviations
3.1 Definitions
For the purposes of this part of the I-ETS, the following def
...