ETSI I-ETS 300 302-2 ed.1 (1995-12)

SLOVENSKI STANDARD
SIST I-ETS 300 302-2 E1:2003
01-december-2003
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Integrated Services Digital Network (ISDN); Videotelephony teleservice; Part 2:
Electroacoustic characteristics for 3,1 kHz bandwidth loudspeaking and handsfree
terminals
Ta slovenski standard je istoveten z: I-ETS 300 302-2 Edition 1
ICS:
33.080 Digitalno omrežje z Integrated Services Digital
integriranimi storitvami Network (ISDN)
(ISDN)
SIST I-ETS 300 302-2 E1:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST I-ETS 300 302-2 E1:2003

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SIST I-ETS 300 302-2 E1:2003
INTERIM
EUROPEAN I-ETS 300 302-2
TELECOMMUNICATION December 1995
STANDARD
Source: ETSI TC-TE Reference: DI/TE-04008.2
ICS: 33.080
ISDN, videotelephony terminals, 3,1 kHz audio, handsfree, loudspeaking, LD-CELP coding
Key words:
Integrated Services Digital Network (ISDN);
Videotelephony teleservice;
Part 2: Electroacoustic characteristics for 3,1 kHz bandwith
loudspeaking and handsfree terminals
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
F-06921 Sophia Antipolis CEDEX - FRANCE
Postal address:
650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
Office address:
c=fr, a=atlas, p=etsi, s=secretariat - secretariat@etsi.fr
X.400: Internet:
Tel.: +33 92 94 42 00 - Fax: +33 93 65 47 16
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 1995. All rights reserved.
New presentation - see History box

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I-ETS 300 302-2: December 1995
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 300 302-2: December 1995
Contents
Foreword .5
1 Scope .7
2 Normative references.7
3 Definitions and abbreviations .8
3.1 Definitions .8
3.2 Abbreviations .9
4 Mode "0U" characteristics .9
4.1 Default encoding law.9
4.2 A-law encoding .9
4.3 μ-law encoding.9
5 Characteristics for framed transmission in PCM encoding .9
5.1 General .9
5.1.1 Encoding .10
5.1.2 Relative level .10
5.1.3 Standard user's position.10
5.1.3.1 "Compact" terminal.10
5.1.3.2 Terminal with separated acoustic front end.10
5.1.4 Volume control .10
5.2 Sensitivity - frequency response .10
5.3 Loudness Ratings (SLR and RLR) .10
5.3.1 Sending Loudness Rating (SLR).11
5.3.2 Receiving Loudness Rating (RLR).11
5.3.2.1 Maximum sensitivity.11
5.3.2.2 Volume control range .11
5.4 Terminal Coupling Loss (TCL).11
5.4.1 Weighted Terminal Coupling Loss (TCLw) .11
5.4.2 Stability.11
5.5 Distortion.11
5.6 Out of band signals.11
5.7 Noise.12
5.7.1 Sending .12
5.7.2 Receiving.12
5.7.2.1 A-weighted noise .12
5.7.2.2 Third octave band spectrum.12
5.8 Absolute delay.12
5.9 Lip synchronisation .12
5.10 Switching characteristics.12
5.11 Echo cancelling characteristics.12
5.12 Articulation .12
6 Characteristics for framed transmission in LD-CELP encoding.13
6.1 General .13
6.2 Sensitivity.13
6.2.1 Sending .13
6.2.2 Receiving.13
Annex A (informative): Bibliography.14
History.15

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I-ETS 300 302-2: December 1995
Foreword
Part 2 of this Interim European Telecommunication Standard (I-ETS) was 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 European Telecommunication Standard
(ETS), have it's life extended for a further two years, be replaced by a new version or, be withdrawn.
This is the second Part of an I-ETS which is currently intended to comprise four Parts.
Part 1: Electroacoustic characteristics for handset telephony function when using Pulse Code
Modulation encoding.
Part 2: Electroacoustic characteristics for 3,1 kHz bandwidth loudspeaking and handsfree
terminals.
Part 3: Electroacoustic characteristics for 7 kHz bandwidth handset terminals.
Part 4: Electroacoustic characteristics for 7 kHz bandwidth loudspeaking and handsfree terminals.
Proposed announcement date
Date of adoption of this I-ETS: 1 December 1995
Date of latest announcement of this I-ETS (doa): 31 March 1996

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I-ETS 300 302-2: December 1995
1 Scope
This I-ETS specifies the electroacoustic characteristics for 3,1 kHz bandwidth loudspeaking and
handsfree functions implemented in videotelephony terminals. These terminals are intended for use in the
videotelephony teleservice and connected to the basic access of the coincident S and T reference point of
the Integrated Services Digital Network (ISDN) using either Pulse Code Modulation (PCM) encoding
according to CCITT Recommendation G.711 [1], A-law or low delay code-excited linear prediction (LD-
CELP) coding at 16 kbit/s as specified in CCITT Recommendation G.728 [2].
The videotelephony teleservice in the ISDN is defined in ETS 300 264.
The requirements of clauses 4 and 5 are applicable to all videotelephonic terminals and the requirements
of clause 6 is applicable when the optional LD-CELP encoding is implemented.
The requirements of this I-ETS specify those characteristics which deviate from those an ISDN 3,1 kHz
telephony terminal needs to meet due to conditions which are special for videotelephony applications (e.g.
delay, measurement position). The corresponding requirements to an ISDN 3,1 kHz telephony
loudspeaking and handsfree terminal can be found in I-ETS 300 245-3 [3] and in I-ETS 300 245-8 for
LD-CELP coding.
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] CCITT Recommendation G.711 (1988): "Pulse code modulation (PCM) of voice
frequencies".
[2] CCITT Recommendation G.728 (1992): "Coding of speech at 16 kbit/s using low
delay code excited linear prediction".
[3] I-ETS 300 245-3 (1995): "Integrated Services Digital Network (ISDN); Technical
characteristics of telephony terminals; Part 3: Pulse Code Modulation (PCM)
A-law, loudspeaking and handsfree telephony".
[4] CCITT Recommendation P.10 (1988): "Vocabulary of terms on telephone
transmission quality and telephone sets".
[5] CCITT Recommendation G.701 (1988): "Vocabulary of digital transmission and
multiplexing, and pulse code modulation (PCM) terms".
[6] ETS 300 111 (1992): "Integrated Services Digital Network (ISDN); Telephony
3,1 kHz teleservice, Service description".
[7] ETS 300 145: "Integrated Services Digital Network (ISDN); Audiovisual
teleservices; Videotelephone systems and terminal equipment operating on one
or two 64 kbit/s channels".
[8] CCITT Recommendation I.112 (1988): "Vocabulary of terms for ISDNs".
[9] ETS 300 144: "Integrated Services Digital Network (ISDN); Audiovisual
teleservices; Frame structure for a 64 kbit/s to 1 920 kbit/s channel and
associated syntax for inband signalling".
[10] CCITT Recommendation G.101 (1988): "The transmission plan".
[11] I-ETS 300 302-1: "Integrated Services Digital Network (ISDN); Videotelephony
teleservice, Part 1: Electroacoustic characteristics for telephony function when
using Pulse Code Modulation (PCM) encoding".

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3 Definitions and abbreviations
3.1 Definitions
For the purposes of this Part of the I-ETS, the relevant definitions and abbreviations in CCITT
Recommendations P.10 [4] and
...