Integrated Services Digital Network (ISDN); Videotelephony teleservice; Part 1: Electroacoustic characteristics for handset telephony function when using Pulse Code Modulation (PCM) encoding

Standardization of electroacoustical characteristics of videotelephony terminals for Integrated System Digital Network using PCM A-law coding and handset functions.

Digitalno omrežje z integriranimi storitvami (ISDN) – Daljinske storitve: videotelefonija – 1. del: Elektroakustične karakteristike za funkcijo telefonije s pogovorko pri uporabi kodiranja z impulzno-kodno modulacijo (PCM)

General Information

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

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SLOVENSKI STANDARD
SIST I-ETS 300 302-1 E1:2003
01-december-2003
'LJLWDOQRRPUHåMH]LQWHJULUDQLPLVWRULWYDPL ,6'1 ±'DOMLQVNHVWRULWYH

YLGHRWHOHIRQLMD±GHO(OHNWURDNXVWLþQHNDUDNWHULVWLNH]DIXQNFLMRWHOHIRQLMHV

SRJRYRUNRSULXSRUDELNRGLUDQMD]LPSXO]QRNRGQRPRGXODFLMR 3&0
Integrated Services Digital Network (ISDN); Videotelephony teleservice; Part 1:

Electroacoustic characteristics for handset telephony function when using Pulse Code

Modulation (PCM) encoding
Ta slovenski standard je istoveten z: I-ETS 300 302-1 Edition 1
ICS:
33.080 Digitalno omrežje z Integrated Services Digital
integriranimi storitvami Network (ISDN)
(ISDN)
SIST I-ETS 300 302-1 E1:2003 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST I-ETS 300 302-1 E1:2003
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SIST I-ETS 300 302-1 E1:2003
INTERIM
EUROPEAN I-ETS 300 302-1
TELECOMMUNICATION December 1994
STANDARD
Source: ETSI TC-TE Reference: DI/TE-04008.1
ICS: 33.080
ISDN, videotelephony terminals, audio
Key words:
Integrated Services Digital Network (ISDN);
Videotelephony teleservice
Part 1: Electroacoustic characteristics for handset
telephony function when using Pulse Code Modulation (PCM)
encoding
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 1994. All rights reserved.
New presentation - see History box
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SIST I-ETS 300 302-1 E1:2003
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I-ETS 300 302-1: December 1994

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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SIST I-ETS 300 302-1 E1:2003
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I-ETS 300 302-1: December 1994
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...................................................................................................................10

5 Characteristics for framed transmission............................................................................................10

5.1 General ..............................................................................................................................10

5.1.1 Encoding .......................................................................................................10

5.1.2 Relative level .................................................................................................10

5.1.3 Volume control ..............................................................................................11

5.2 Sensitivity - frequency response ........................................................................................11

5.3 Sending and Receiving Loudness Rating (SLR and RLR) ................................................11

5.4 Sidetone.............................................................................................................................11

5.4.1 Talker sidetone..............................................................................................11

5.4.2 Listener sidetone ...........................................................................................11

5.5 Terminal Coupling Loss (TCL)...........................................................................................11

5.5.1 TCLw .............................................................................................................11

5.5.2 Stability loss...................................................................................................11

5.6 Distortion............................................................................................................................11

5.7 Variation of gain with input level.........................................................................................11

5.8 Out-of-band signals ...........................................................................................................12

5.9 Noise..................................................................................................................................12

5.10 Acoustic shock...................................................................................................................12

5.11 Absolute delay....................................................................................................................12

5.12 Lip synchronization ............................................................................................................12

Annex A (normative): Test methods......................................................................................................13

A.1 General conditions for testing............................................................................................................13

A.2 Delay .................................................................................................................................................13

A.2.1 Sending..............................................................................................................................13

A.2.2 Receiving ...........................................................................................................................13

A.3 Listener SideTone Rating (LSTR) .....................................................................................................13

A.4 Weighted Terminal Coupling Loss (TCLw) .......................................................................................14

Annex B (informative): Bibliography........................................................................................................15

History..........................................................................................................................................................16

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SIST I-ETS 300 302-1 E1:2003
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I-ETS 300 302-1: December 1994
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I-ETS 300 302-1: December 1994
Foreword

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 a European Telecommunication Standard

(ETS), have it's life extended for a further 2 years, be replaced by a new version of the I-ETS or, be

withdrawn.

This is the first Part of an I-ETS which is currently intended to comprise 6 parts.

Part 1: Electroacoustic characteristics for handset terminals when using Pulse
Code Modulation (PCM) encoding.
Part 2: Audio aspects - Pulse Code Modulation (PCM) A-Law loudspeaking and
handsfree.
Part 3: Wideband handset.
Part 4: Wideband coding and loudspeaking handsfree function.
Part 5: Application of 3,1 kHz bandwidth, 16 kbit/s speech coding algorithm.
Part 6: Application of low bitrate (below 32 kbit/s speech coding algorithm).
NOTE: Parts 3 to 6 of this I-ETS are still under study within ETSI.
Proposed announcement date
28th February 1995
Date of latest announcement of this I-ETS (doa):
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I-ETS 300 302-1: December 1994
1 Scope

This Part of the I-ETS specifies the electroacoustic characteristics for handset telephony functions

implemented in videotelephony terminals. Those 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 Pulse Code Modulation (PCM) encoding according to CCITT

Recommendation G.711 [1], A-law and μ-law.
The videotelephony teleservice in the ISDN is defined in ETS 300 264 [2].

The requirements of this I-ETS specify those characteristics which deviate from those which an ISDN

3,1 kHz telephony terminal needs to meet due to conditions which are special for the videotelephony

application (e.g. delay, framing). The corresponding requirements to an ISDN 3,1 kHz telephony terminal

can be found in I-ETS 300 245-2 [3].

The relevant test methods are described in I-ETS 300 245-2 [3] and in ETS 300 085 [4].

NOTE: Type approval requirements for the 3,1 kHz telephony (CCITT Recommendation G.

711 [1], A-law) function of a videotelephony terminal can be found in TBR 8.
2 Normative references

This I-ETS incorporates by dated or undated reference, provision 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 referenced to applies.
[1] CCITT Recommendation G.711 (1988): "Pulse code modulation (PCM) of voice
frequencies".
[2] ETS 300 264: "Integrated Services Digital Network (ISDN) - Videotelephony
teleservice - Service description".

[3] I-ETS 300 245-2 (1993): "Integrated Services Digital Network (ISDN) - Technical

characteristics of telephony terminals - Part 2: Pulse Code Modulation (PCM) A-
law, handset telephony".
[4] ETS 300 085 (1990): "Integrated Services Digital Network (ISDN) - 3,1 kHz
telephony teleservice - Attachment requirements for handset terminals".
[5] CCITT Recommendation G.122 (1988): "Influence of national systems on
stability - talker echo and listener echo in international connections".
[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 - Videtelephony systems and terminal equipment operating on one
or two 64 kbit/s channels".
[8] ETS 300 144: "Integrated Services Digital Network (ISDN) - Audiovisual

services - Frame structure for a 64 kbit/s to 1 920 kbit/s channel and associated

syntax for inband signalling".
[9] ITU-T Recommendation P.64 (1993): "Determination of sensitivity/frequency
characteristics of local telephone systems".
[10] CCITT Recommendation G.701 (1988): "Vocabulary of digital transmission and
multiplexing, and pulse code modulation (PCM) terms".
[11] CCITT Recommendation I.112 (1988): "Vocabulary of terms for ISDNs".
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I-ETS 300 302-1: December 1994
[12] CCITT Recommendation P.10 (1988): "Vocabulary of terms on telephone
transmission quality and telephone sets".

[13] ETS 300 143 (1993): "Integrated Services Digital Network (ISDN) - Audiovisual

services inband signalling procedures for audiovisual terminals using digital
channels up to 2 048 kbit/s".
[14] CCITT Recommendation G.725 (1988): "System aspects for the use of the 7
kHz audio codec within 64 kbit/s".

[15] ETS 300 267-1: "Integrated Services Digital Network (ISDN) - Telephony 7 kHz

and videotelephony teleservices - Digital Subscriber Signalling System No. one
(DSS1) protocol - Part 1: Protocol specification".
[16] ITU-T Recommendation P.31 (1993): "Transmission characteristics for digital
telephones".
[17] CCITT Recommendation G.101 (1988): "The transmission plan".
[18] ISO 3 (1977): "Preferred numbers - Series of preferred numbers".
[19] ITU-T Recommendation P.57 (1993): "Artificial ears".

[20] IEC 225: "Octave, half-octave and third-octave band filters intended for the

analysis of sound and vibrations".
[21] ITU-T Recommendation P.79 (1993): "Calculation of loudness ratings for
telephone sets".
3 Definitions and abbreviations
3.1 Definitions
For the purposes of this part of the I-ETS, the following definitions apply:
digital interface: The interface at the coincident S and T reference point.

Loudness Rating Guard-ring Position (LRGP): This position is defined in ITU-T Recommendation P.64

[9].

modes of operation: For the videotelephony teleservice in the ISDN, the modes of operation are defined

in ETS 300 145 [7].

service channel: A sub-channel which provides end-to-end signalling in the 64 kbit/s channel. The

service channel consists of the eighth bit of each octet. The structure of a 64 kbit/s channel (B-channel)

and the position of the service channel is described in ETS 300 144 [8].

telephony 3,1 kHz teleservice: A description of the telephony 3,1 kHz teleservice in the ISDN is to be

found in ETS 300 111 [6].

Terminal Coupling Loss (TCL): The frequency dependent coupling loss between the receiving port and

the sending port of a terminal due to:
- acoustical coupling at the user interface;

- electrical coupling due to crosstalk in the handset cord or within the electrical circuits;

- seismic coupling through the mechanical parts of the terminal.
...

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