SIST ETS 300 149 E1:2003

• Abstract:

  To specify an Audio Syntax for Videotex.

• Status: Published
• Publication Date: 30-Nov-2003
• ICS: 33.160.99 - Other audio, video and audiovisual equipment
• ICS: 35.180 - IT Terminal and other peripheral equipment
• Technical Committee: SS EIT - Technical Board for the electrotechnical, information technology and telecommunications fields
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Dec-2003
• Due Date: 01-Dec-2003
• Completion Date: 01-Dec-2003
• Ref Project: ETSI ETS 300 149 ed.1 (1992-03) - Terminal Equipment (TE); Videotex Audio syntax

SIST ETS 300 149 E1:2003 is the Slovenian adoption of ETS 300 149 Edition 1. It specifies an audio syntax for Videotex, prepared by ETSI, for carrying sound information in Videotex services and terminal equipment. In practice, it tells terminal designers and service providers how audio data is identified, switched, packed, and transported in a Videotex environment.

What does SIST ETS 300 149 E1:2003 specify?

SIST ETS 300 149 E1:2003 specifies the data syntax used by Videotex services to convey sound information. It is intended for terminals connected to public data networks, typically ISDN syntax-based Videotex terminals attached at either side of a T reference point or at coincident S and T reference points of a public ISDN.

The document is organized around the full audio syntax, from switching into the audio environment to header fields, sound blocks, and ISDN application rules.

Annex	What it covers
Annex A (normative)	Translation modes, including the byte-packing rules for the different translation schemes

The main clauses cover scope, normative references, definitions, the overall syntax overview, the introducer, the ISO/IEC 9281 switching structure, the sound header, the sound block, and application rules for ISDN syntax-based Videotex.

What are the key requirements of SIST ETS 300 149 E1:2003?

The standard is built around a tagged, block-based audio syntax. Clause 5 and Clause 6 define how a terminal enters the audio mode, how it leaves it, and how audio data is carried inside ISO/IEC 9281 Picture Entities (PEs). That matters because implementers need a predictable state machine, not a continuous audio stream, and the terminal must handle explicit switching between data syntaxes and the audio environment.

Switching and data syntax structure

Clause 5 defines the sound introducer, which is based on ISO/IEC 9281, and Clause 6 explains switching between the base ISO 2022 environment and audio. The document also describes how a Videotex service may interrupt audio transmission in blocks so that user interaction remains responsive.

In practice, this means the terminal should not search for free-form audio delimiters. It should react to the coded environment changes and block boundaries defined by the syntax.

Sound header fields

Clause 7 defines a sound header that can carry five attributes:

• encoding
• bitrate
• recording level
• translation mode
• synchronisation mode

The header may omit attributes, and omitted values inherit the last defined value or a default. This is important for implementation because a sender can avoid repeating unchanged settings, while a receiver must retain state across sound blocks.

Clause 7.2.2 through 7.2.6 limit each field to defined values and treat reserved values as ignorable. The standard also gives default values in Table 2. For a reader, that means the header is not just descriptive - it controls how the following sound block must be decoded and played.

Allowed encodings and bitrate classes

Clause 7.2.2 identifies the allowed encoding families, including PCM, ADPCM, sub-band ADPCM, RPE-LTP coding, and other named coding methods. Clause 7.2.3 defines the bitrate field and includes fixed, GSM-related, and provisional rates.

The practical point is that a device must recognize the encoding family before it can interpret the data block, and it must match the bitrate field to the coding method used. Unknown or reserved values are not to be acted on.

Sound blocks and sample packing

Clause 8 states that each sound block conforms to the encoding named in the preceding sound header, or to the default algorithm if no header has been provided. It also explains how samples with fewer than 8 bits are concatenated before transparency processing, and it refers to coding conventions from CCITT recommendations for certain sound formats.

For implementers, this clause is the core decoding rule for the actual audio payload. It tells you how the coded samples are arranged before the terminal applies the transparency mechanism or plays the sound.

ISDN syntax-based Videotex rules

Clause 9 restricts the combinations that apply to ISDN syntax-based Videotex. It distinguishes between mandatory and optional encoding/bitrate combinations and specifies that translation mode 0 is mandatory in this profile.

This is the part buyers and integrators usually check first when they need interoperability on ISDN-based Videotex equipment. It tells them which audio profiles the terminal is expected to support in that environment.

Translation modes

Annex A defines the normative translation modes. It covers no translation, a mode with a special handling for US characters, a 3-in-4 coding scheme, and two shift-based schemes for 8-bit and 7-bit transmission.

That matters when sound data must pass through a coded text environment. The annex gives the exact packing behavior so the transmitted bytes remain interpretable across the link.

What terms does SIST ETS 300 149 E1:2003 define?

• Audio bit rate - The bit rate needed to carry coded audio in real time.
• Data Syntax II - The European data syntax used by ETS 300 072 to ETS 300 076.
• Encoding - The coding method and coding convention used for the audio data.
• Picture Entity (PE) - The ISO/IEC 9281 container that combines control information with the data payload.
• Recording level - The mean level at which the sound was recorded.
• Synchronisation mode - The attribute that defines how audio output is synchronized.
• Translation mode - The method used to pack data into octets so that transmission remains transparent.

Who uses SIST ETS 300 149 E1:2003?

SIST ETS 300 149 E1:2003 is used by Videotex terminal manufacturers, telecom engineers, service providers, and test laboratories working with audio over Videotex. It is relevant to people designing interoperability for public data networks and public ISDN, especially where the terminal must switch between data syntax and audio syntax.

Buyers and quality managers use it when they need to confirm that a terminal or service supports the specified Videotex audio behavior. Test teams use it to verify switching, header handling, block format, and supported encoding and bitrate combinations.

What changed in SIST ETS 300 149 E1:2003 from the previous edition?

SIST ETS 300 149 E1:2003 is identified as identical to ETS 300 149 Edition 1.

Which standards are used with SIST ETS 300 149 E1:2003?

The standard relies on several normative references and companion texts:

• ISO 9281 and ISO 2022 - provide the coding-method identification and code-extension framework used for switching.
• ETS 300 072 to ETS 300 076 - define the Videotex presentation layer syntax, including geometric display, transparent data, processable data, and the Terminal Facility Identifier (TFI).
• CCITT Recommendation T.101 - provides the Videotex data-syntax framework and the idea of multiple data syntaxes.
• ISO 646 - gives the default 7-bit coded character set used in the base environment.
• CCITT Recommendation G.711, G.721, G.723, and G.722 - provide the audio coding methods referenced in the encoding fields.
• GSM Specification 06.10 - contributes the GSM full-rate speech transcoding method.
• CCITT Recommendations J.41 and J.42 - contribute higher-quality sound coding methods used in the encoding definitions.

What does the SIST ETS 300 149 E1:2003 document contain?

The document contains a switching model, a sound header structure, sound block rules, and ISDN application rules. It also includes a global switching figure, a PE/PCE/PDE syntax description, a code-table mapping for header attributes, a default-values table, and a table of applicable encoding/bitrate combinations.

Annex A adds the translation-mode procedures and the byte-mapping rules for each mode. Those annex tables are the practical part used in implementation and interoperability testing, because they define how audio data is transformed for transport.

SLOVENSKI STANDARD
01-december-2003
Terminalska oprema (TE) – Videotex – Zvokovna skladnja
Terminal Equipment (TE); Videotex Audio syntax
Ta slovenski standard je istoveten z: ETS 300 149 Edition 1
ICS:
33.160.99 Druga avdio, video in Other audio, video and
avdiovizuelna oprema audiovisual equipment
35.180 Terminalska in druga IT Terminal and other
periferna oprema IT peripheral equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN ETS 300 149
TELECOMMUNICATION March 1992
STANDARD
Source: ETSI TC-TE Reference: DE/TE-01007
ICS:
Videotex, Audio syntax
Key words:
Terminal Equipment (TE);
Videotex
Audio syntax
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 - [e-mail]
X.400: Internet:
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 1992. All rights reserved.
New presentation - see History box

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ETS 300 149: March 1992
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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ETS 300 149: March 1992
Contents
Foreword .5
1 Scope .7
2 Normative references .7
3 Definitions, symbols and abbreviations .8
3.1 Definitions.8
3.2 Symbols and abbreviations .8
4 Overview . 9
5 Introducer. 9
6 ISO/IEC 9281 syntax and switching structure .9
6.1 Overall switching of coding environment.9
6.2 Switching into the audio mode. 10
6.3 ISO/IEC 9281 syntax structure. 11
7 Sound header . 13
7.1 Introduction . 13
7.2 Header structure . 13
7.2.1 Concepts . 13
7.2.2 Encoding . 13
7.2.3 Bitrate . 14
7.2.4 Recording level . 14
7.2.5 Translation mode . 14
7.2.6 Synchronisation mode . 14
7.3 Default values . 15
8 Sound block . 15
9 Application rules for ISDN syntax-based Videotex . 16
9.1 Encoding/bitrate combinations. 16
9.2 Translation mechanisms . 16
Annex A (normative): Translation modes. 17
A.1 Mode 0. 17
A.2 Mode 1 (no translation except US). 17
A.3 Mode 2 (3-in-4 coding) . 17
A.4 Mode 3 (shift scheme - 8-bits). 18
A.5 Mode 4 (shift scheme - 7-bits). 18
History. 20

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ETS 300 149: March 1992
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ETS 300 149: March 1992
Foreword
This European Telecommunication Standard (ETS) has been prepared by the Terminal Equipment (TE)
Technical Committee of the European Telecommunications Standards Institute (ETSI).
This ETS is part of a series of standards which describe the Videotex data syntax and is consistent with
the work being carried out by CCITT Study Group VIII on Question 14. It also specifies a common data
syntax for transmitting sound to be used by Videotex terminal equipment.
This ETS defines a data syntax for conveying audio data in a Videotex environment. In this data syntax a
variety of audio encoding techniques are embedded in one general structure. No algorithms or specific
sound encodings are specified. It allows for the embedding of both waveform and phonemic encodings.
This ETS closely follows the concepts and coding techniques as defined in ISO/IEC 9281 [1] for the
identification of pictorial information and for switching between picture encoding environments and coding
systems according to ISO 2022 [2].

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ETS 300 149: March 1992
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ETS 300 149: March 1992
1 Scope
This standard specifies the data syntax to be used by Videotex services for conveying sound information.
This standard is applicable to terminals connected to public data networks. Typically, these should be
terminals, supporting Integrated Services Digital Network (ISDN) syntax-based Videotex, to be attached at
either side of a T reference point or coincident S and T reference points of a public ISDN.
2 Normative references
This ETS incorporates by dated or 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 ETS
only when incorporated in it by amendment or revision. For undated references the latest edition of the
publication referred to applies.
[1] ISO 9281: "Information technology - Picture coding methods".
[2] ISO 2022: "Information Processing - ISO 7-bit and 8-bit coded character sets -
Code extension techniques".
[3] ETS 300 072 (1990): "Terminal Equipment (TE);
Videotex presentation layer protocol, Videotex presentation layer data syntax".
[4] ETS 300 073 (1990): "Videotex presentation layer data syntax : Geometric
display (CEPT Recommendation T/TE 06-03, Edinburgh 1988)".
[5] ETS 300 074 (1990): "Videotex presentation layer data syntax : Transparent
data (CEPT Recommendation T/TE 06-03, Edinburgh 1988)".
[6] ETS 300 075 "1990": "Terminal Equipment (TE); Videotex processable data".
[7] ETS 300 076 (1990): "Terminal Equipment (TE); Videotex, Terminal Facility
Identifier (TFI)".
[8] CCITT Recommendation T.101 (1988): "International Interworking for Videotex".
[9] ISO 646: "Information processing - ISO 7-bit coded character set for information
exchange".
[10] CCITT Recommendation G.711 (1988): "Pulse code modulation of voice
frequencies".
[11] CCITT Recommendation G.721 (1988): "32 kbit/s adaptive differential pulse
code modulation.
[12] CCITT Recommendation G.723 (1988): "Extensions of Recommendation G.721
ADPCM to 24 and 40 kbit/s for DCME application".
[13] CCITT Recommendation G.722 (1988): "7 kHz audio-coding within 64 kbit/s".
[14] GSM Specification 06.10: "GSM Full-rate speech transcoding".
[15] CCITT Recommendation J.41: "Characteristics of equipment for the coding of
analogue high quality sound programme signals for transmission on 384 kbit/s
channels".
[16] CCITT Recommendation J.42: "Characteristics of equipment for the coding of
analogue medium quality sound programme signals for transmission on 384
kbit/s channels".
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ETS 300 149: March 1992
3 Definitions, symbols and abbreviations
3.1 Definitions
For the purposes of this ETS, the following definitions apply:
Audio bit rate: the bit rate required to convey data which is coded according to a specific encoding in real
time.
Data Syntax: data syntax I, II or III.
Data Syntax I: data syntax used in the CAPTAIN system.
Data Syntax II: European data syntax (ETSs 300 072 to 300 076 [3] to [7]).
Data Syntax III: data syntax used in the NAPLPS system.
NOTE : The three data syntaxes above are described in CCITT Recommendation T.101 [8].
Encoding: coding method of audio data according to a specific algorithm and coding convention.
Recording level: the mean level of the sound signal as it was recorded.
Sampling rate: aspect of a sound encoding defining the amount of samples encoded per time unit.
Synchronisation mode: attribute of an encoding defining the synchronisation to be applied to the audio
data.
Transfer rate: the effective amount of data bits which can be exchanged between communicating entities.
Translation mode: attribute of an encoding defining the method of packing data into octets in order to
achieve transparency.
3.2 Symbols and abbreviations
For the purposes of this ETS the following abbreviations apply:
ADPCM Adaptive Differential Pulse Code Modulation
AM Alphamosaic
CMI Coding Method Identifier
GSM Special Mobile Group
LI Length Indicator
MI Method Identifier
P Profile in Data syntax II
PCD Picture Coding Delimiter
PCE Picture Control Entity
PCM Pulse Code Modulation
PDE Picture Data Entity
PE Picture Entity
PI Picture Identifier
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ETS 300 149: March 1992
PM Picture Mode
RPE-LTP Residual Pulse Excitation - Long Term Predictive
VPCE Videotex Presentation Control Element
4 Overview
The audio data syntax allows for the embedding of a variety of different audio-coding techniques in one
single overall structure. Each information element is tagged with an introducer indicating:
- the coding technique being used;
- the audio bit rate of the coding.
The audio bit rate indicates the bit rate with which the used encoding can be conveyed in real time. The
audio bit rate is strongly related to the sampling rate and may be different from the actual transfer rate of
the protocol being used for data exchange.
The audio data syntax provides for block-wise transmission of audio data, thus avoiding the need for
terminals to scan through streams of audio data for delimiter sequences.
To increase the actual data throughput, the audio data syntax provides for transparent data transport,
thereby surpassing the coding convention, that data representing information is coded in columns 2 - 7
(and 10 - 15 in a 8-bit environment).
5 Introducer
The introducer for sound shall be in accordance with ISO/IEC 9281 [1] and has the following coding: ESC
7/0 2/4 where 2/4 identifies audio-coding.
The return from the sound environment may be done by using ESC 2/5 4/0 (return to default ISO 2022 [2]
environment) or by switching explicitly to an identified environment using another ESC 2/5 x/y sequence, or
by the end of an ISO/IEC 9281 [1] picture element, at which time the current ISO 2022 [2] coding
environment (i.e. the base Videotex data syntax) takes effect.
6 ISO/IEC 9281 syntax and switching structure
In some Videotex systems, in a situation where an interruption of the audio data flow is required (caused
probably by user interaction) the following may occur. The Picture Entity (PE) being sent to the terminal is
completely sent. The next PE sent to the terminal can have the Picture Data Entity (PDE) value set to
04/02 to indicate the end of the data, the PDE will contain only byte (Length Indicator = 1).
If possible, the speed of the network should be taken into account when defining the number of bytes in a
PDE with the aim of tolerable interaction response time. As a rough guide, a block length that does not
result in a response time exceeding 200 ms - 500 ms may by used.
6.1 Overall switching of coding environment
ISO/IEC 9281 [1] describes a technique for identifying coding methods. The Videotex photographic audio
mode is one of the coding methods identified by ISO/IEC 9281 [1]. The diagram in figure 1 gives an
overview of the relationship between the Videotex data syntaxes and ISO/IEC 9281 [1] coding
environments.
A Videotex data syntax can be explicitly entered using an ESC 2/5 F code, this is also the mechanism for
entering an ISO/IEC 9281 [1] environment. The Videotex data syntaxes can therefore be regarded as
being ISO/IEC 9281 [1] environments.

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ETS 300 149: March 1992
A Videotex terminal should usually begin operation, by default, in one of the data syntaxes. It shall not be
mandatory to first send an ESC 2/5 F code. The diagram shows how these codes can be used to switch a
terminal supporting more than one data syntax from one data syntax to another.
NOTE: It is advisable that the Videotex service explicitly switches the terminal into the required
data syntax by sending an ESC 2/5 F sequence to the terminals at connect time.
6.2 Switching into the audio mode
A Videotex terminal operating within one of the data syntaxes can enter the audio mode with the code ESC
7/0 Coding Method Identifier (CMI), as defined in ISO/IEC 9281 [1]. The CMI is used to distinguish
between coding methods. In the case of Videotex this shall be, for example, a distinction between audio
and photographic data.
An alternative mechanism is defined by ISO/IEC 9281 [1] for entering a coding environment. A unique ESC
2/5 F code is registered for the purpose of switching directly into this coding environment. This implies that
a non-Videotex terminal can enter the Videotex audio mode. A Videotex terminal can also use an ESC 2/5
F code to enter a particular environment, in this situation the terminal operation is not defined by a data
syntax and no assumptions can be made about the terminal model (see ETS 300 076 [7]).

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ETS 300 149: March 1992
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