IEC 62375:2004 PDF

Name: IEC 62375:2004 — Video systems (625/50 progressive) - Video and accompanied data using the vertical blanking interval - Analogue interface
SKU: IEC 62375:2004
Price: 35 EUR
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Video systems (625/50 progressive) - Video and accompanied data using the vertical blanking interval - Analogue interface

Название (английский):

IEC 62375:2004

Video systems (625/50 progressive) - Video and accompanied data using the vertical blanking interval - Analogue interface

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 15
Дата публикации:: 26 февраля 2004 г.
Издание:: IEC IS 62375 edition 1 version 1
ICS:: 33.160.40

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Описание (английский):

IEC 62735:2004 specifies the method of transfer of aspect ratio information code, copy control information code and other codes in the vertical blanking interval of the luminance signal. It is applicable to the transfer of video related information with the video signal through the baseband analogue signal of 625-line/50-frame progressive scan video system between digital and analogue video equipment. This bilingual version (2012-08) corresponds to the monolingual English version, published in 2004-02.

Abstract

Похожие стандарты

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Overview

IEC 62375:2004 defines a standardized method for embedding video-related metadata into the vertical blanking interval (VBI) of the luminance (baseband analogue) signal for the 625-line / 50‑frame progressive scan video system. The standard covers the analogue interface used to transfer aspect-ratio codes, copy-control (CGMS‑A) and other companion data between digital and analogue video equipment.

Key topics and technical requirements

Signal location and timing

Data burst transmitted on line 43 of each frame; start at 5.5 μs ± 0.125 μs from horizontal sync.

Electrical and timing parameters

Clock: 10 MHz ± 1 kHz (sampling period T = 100 ns).
Signal amplitude: 500 mV ± 25 mV (relative to 700 mV max video).

Modulation and coding

Uses bi‑phase-L (bi‑phase) coding; one data bit = 6 clock elements (T = 6·Ts).
Preamble (run‑in + start code) precedes data.

Data structure

Total: 14 bits (13 data bits + 1 error/parity bit).
Organized into 4 groups:
- Group 1 (4 bits): Aspect‑ratio label, letterbox/full format and parity.
- Group 2 (4 bits): Reserved.
- Group 3 (3 bits): Subtitles (in/out of active image area + reserved).
- Group 4 (3 bits): Surround sound / CGMS‑A / copy control and other flags.

Aspect ratio encoding

Encodes ranges (4:3, 14:9, 16:9, >16:9) and position (centre/top), with mapping to active line counts.

Interoperability note

Intended for systems complying with ITU‑R BT.1358 (625/50 progressive studio parameters).

Applications and who uses it

IEC 62375 is practical for:

Broadcast and studio engineers embedding metadata into analogue progressive video signals.

Video equipment manufacturers (analogue/digital converters, recorders, players) implementing CGMS‑A and aspect‑ratio signalling.

Post‑production and transcoding facilities ensuring correct display (letterbox/full‑format) and subtitle placement.

Test labs and compliance teams validating analogue interface behaviour and signal timing.

Embedding metadata in the VBI enables downstream devices to correctly display aspect ratio, honor copy‑protection flags, and place subtitles - improving compatibility between analogue and digital video systems.

Related standards and notes

Normative reference: ITU‑R BT.1358 (studio parameters for 625 and 525 line progressive systems).

The IEC foreword notes potential patent claims (Sony listed); manufacturers should verify licensing implications when implementing CGMS‑A.

Keywords: IEC 62375:2004, vertical blanking interval, 625/50 progressive, analogue interface, aspect ratio, CGMS‑A, copy control, VBI, bi‑phase coding.

IEC 62375:2004 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and who uses it

Related standards and notes

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