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GB 3174-1995Characteristics of the PAL-D television broadcasting system (English PDF)

PAL-D制电视广播技术规范

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Issued by

AQSIQ; SAC

Level / Type

National · Mandatory

Issue date

December 20, 1995

Implementation date

December 1, 1996

Scope

GB 3174-1995 is the English-translated version of PAL-D制电视广播技术规范.

The technical specification of PAL-D, the analogue colour television system China broadcast on for a generation, and the document that defined every parameter a transmitter, a studio and a receiver in the country had to agree on.

The standard specifies the characteristics of the PAL-D television broadcasting system: the video signal and its parameters, the colour encoding, the sound, the radio frequency channel arrangement and the requirements on the transmitted signal.

It applies to the terrestrial broadcasting of PAL-D television.

What it fixes is the whole chain: the 625 line, 50 field per second raster with its scanning and blanking and synchronising parameters; the luminance and chrominance signals, the colour subcarrier and the PAL phase alternation that gives the system its name and its tolerance to phase error; the D variant's channel plan, with the 8 MHz channel spacing and the vestigial sideband arrangement that distinguishes it from the B and G variants used in western Europe; the negative video modulation and the frequency modulated sound carrier with its offset; and the tolerances on all of them, since a broadcast standard is a contract between an unlimited number of transmitters and an unlimited number of receivers, none of which can be adjusted to suit the others.

It is a historical document now, superseded in practice by the digital terrestrial system of GB 20600-2006, but it remains the reference for the legacy plant still in service, for the archives recorded to it, and for anyone who has to interpret material or equipment from the analogue era.

Issued on 20 December 1995 and in force since 1 December 1996, it replaces GB 3174-1982.

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Document preview — GB 3174-1995

National Standard of the People's Republic of China

ICS: 33.160
Classification: M 61
Replacing: GB 3174-1982

Issued by: General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of the PRC

1 Scope
2 Normative references
3 General characteristics
4 Video signal characteristics
5 Colour encoding
6 Sound signal characteristics
7 Radio frequency channel characteristics
8 Transmitted signal requirements

1 Scope

This standard specifies the characteristics of the PAL-D television broadcasting system, including the video signal, the colour encoding, the sound, the radio frequency channel arrangement and the requirements on the transmitted signal.

It applies to the terrestrial broadcasting of PAL-D television.

What it fixes

The whole chain. The 625 line, 50 field per second raster with its scanning, blanking and synchronising parameters. The luminance and chrominance signals, the colour subcarrier, and the phase alternation line by line that gives the system its name and its tolerance to the phase errors that plagued its predecessor.

Then the D variant specifically: the channel plan with its 8 MHz spacing and the vestigial sideband arrangement that distinguishes it from the B and G variants used in western Europe, the negative video modulation, and the frequency modulated sound carrier with its offset.

Why the tolerances are the substance

A broadcast standard is a contract between an unlimited number of transmitters and an unlimited number of receivers, none of which can be adjusted to suit the others. Everything therefore has to be specified with a tolerance, and it is the tolerances rather than the nominal figures that make the system work in the field.

The document is a historical one now, superseded in practice by the digital terrestrial system of GB 20600-2006, but it remains the reference for the legacy plant still in service, for the archives recorded to it, and for anyone who has to interpret material or equipment from the analogue era.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

Referenced standards

Cited by

Similar standards

GB 20600-2006|GB/T 17975.1|GY/T 134|GB/T 14857|GB/T 26270|GY/T 220.1

Editions of GB 3174

Edition	Title	Revision	Status
GB 3174-1995	Characteristics of the PAL-D television broadcasting system	first revision	Current
GB 3174-1982	Characteristics of the PAL-D television broadcasting system	first issue	Superseded

This page sells the current edition, GB 3174-1995. Earlier editions are listed for reference only.

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