SIST I-ETS 300 302-4 E1:2003
(Main)Integrated Services Digital Network (ISDN); Videotelephony teleservice; Part 4: Audio aspects - wideband coding and loudspeaking or handsfree function
General Information
- Abstract
Standardization of electroacoustical characteristics of videotelephony terminals for Integrated Services Digital Network using wideband (CCITT G.722) coding and handset functions.
- Status
- Published
- Publication Date
- 30-Nov-2003
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 01-Dec-2003
- Due Date
- 01-Dec-2003
- Completion Date
- 01-Dec-2003
Overview
SIST I-ETS 300 302-4 E1:2003 is a Slovenian standard that defines the electroacoustic characteristics of videotelephony terminals using the Integrated Services Digital Network (ISDN). Part 4 of this standard specifically addresses the audio aspects related to wideband (7 kHz) coding and the performance of loudspeaking and handsfree functions in videotelephony terminals. The standard is closely aligned with international best practices, referencing key ETSI and ITU-T recommendations for audio and videotelephony services over ISDN.
The main objective of this standard is to ensure high-quality audio performance, proper loudness levels, and consistent handsfree operation for videotelephony across ISDN systems, utilizing CCITT G.722 wideband encoding. By defining these requirements, SIST I-ETS 300 302-4 ensures interoperability and user satisfaction in environments relying on ISDN videotelephony.
Key Topics
- Wideband Audio Coding: Specifies the use of Adaptive Differential Pulse Code Modulation (ADPCM) according to CCITT Recommendation G.722 for 7 kHz audio bandwidth, offering improved clarity over traditional telephony.
- Electroacoustic Parameters: Addresses sending and receiving loudness ratings, sensitivity, frequency response, distortion, volume control, and noise performance.
- Loudspeaking and Handsfree Functions: Defines requirements for loudspeaker and handsfree modes, essential for videotelephony terminals, including user positioning and terminal types (compact or with separated audio front end).
- Terminal Coupling and Stability: Covers terminal coupling loss, weighted terminal coupling loss, and overall system stability to safeguard echo control and voice clarity.
- Testing and Compliance: Provides test conditions and corrective factors for evaluation, ensuring that manufacturers can objectively assess conformity.
Applications
SIST I-ETS 300 302-4 E1:2003 is highly relevant for organizations and manufacturers involved in the design, development, or deployment of videotelephony terminals on ISDN networks. Practical applications include:
- ISDN Videotelephony Terminals: Ensures devices deliver high audio quality, both for end-users in business communication and remote collaboration scenarios.
- Handsfree Conference Systems: Guides the design and testing of conference equipment where multiple participants may interact via loudspeaking terminals.
- Telecommunication Service Providers: Helps providers standardize and certify equipment for ISDN videotelephony services, optimizing end-to-end communication quality.
- Product Compliance and Procurement: Assists manufacturers and buyers in benchmarking products against essential electroacoustic and functional criteria for ISDN videotelephony.
- Interoperability and Quality Assurance: Facilitates seamless operation across different ISDN systems and international networks by aligning with ETSI and ITU-T recommendations.
Related Standards
The following standards are referenced or closely related to SIST I-ETS 300 302-4 E1:2003. They provide essential context and detailed technical provisions for ISDN and audio performance:
- CCITT Recommendation G.722: 7 kHz audio coding within 64 kbit/s, forming the basis for wideband encoding in this standard.
- ETSI ETS 300 264: Describes videotelephony teleservice on ISDN.
- ETSI ETS 300 245-6: Specifies wideband (7 kHz) loudspeaking and handsfree telephony requirements for ISDN.
- ETSI ETS 300 145: Details audiovisual services, including videophone systems and equipment.
- ITU-T Recommendations: Such as G.711 (PCM of voice frequencies), H.261 (video codec for audiovisual services), P.51 (artificial mouth), P.64 (sensitivity/frequency measurement).
By adhering to SIST I-ETS 300 302-4 E1:2003, manufacturers and service providers can ensure enhanced audio quality in videotelephony over ISDN, supporting improved user experiences and broad compatibility with global telecommunications standards.
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Frequently Asked Questions
SIST I-ETS 300 302-4 E1:2003 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Integrated Services Digital Network (ISDN); Videotelephony teleservice; Part 4: Audio aspects - wideband coding and loudspeaking or handsfree function". This standard covers: Standardization of electroacoustical characteristics of videotelephony terminals for Integrated Services Digital Network using wideband (CCITT G.722) coding and handset functions.
Standardization of electroacoustical characteristics of videotelephony terminals for Integrated Services Digital Network using wideband (CCITT G.722) coding and handset functions.
SIST I-ETS 300 302-4 E1:2003 is classified under the following ICS (International Classification for Standards) categories: 33.080 - Integrated Services Digital Network (ISDN). The ICS classification helps identify the subject area and facilitates finding related standards.
SIST I-ETS 300 302-4 E1:2003 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
01-december-2003
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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)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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: secretariat@etsi.fr
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 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
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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
Blank page
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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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I-ETS 300 302-4: September 1996
3 Definitions and abbreviations
3.1 Definitions
For the purposes of this part of the I-ETS, the following def
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