IEC 60774-4:2002 PDF

Name: IEC 60774-4:2002 — Helical-scan video tape cassette system using 12,65 mm (0,5 in) magnetic tape on type VHS - Part 4: S-VHS video cassette system - ET mode
SKU: IEC 60774-4:2002
Price: 35 EUR
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Helical-scan video tape cassette system using 12,65 mm (0,5 in) magnetic tape on type VHS - Part 4: S-VHS video cassette system - ET mode

Название (английский):

IEC 60774-4:2002

Helical-scan video tape cassette system using 12,65 mm (0,5 in) magnetic tape on type VHS - Part 4: S-VHS video cassette system - ET mode

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 10
Дата публикации:: 8 июля 2002 г.
Издание:: IEC IS 60774 edition 1 version 1
ICS:: 33.160.40

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Описание (английский):

The S-VHS ET mode records an S-VHS signal format on a VHS cassette. In this mode, several video signal system recording parameters are switched so that the signal characteristics recorded on the VHS tape are equivalent to S-VHS recording on S-VHS tape. Cassettes recorded in the S-VHS ET mode can be played with an S-VHS based playback system and an VHS equivalent that includes the SQPB function.

Abstract

Похожие стандарты

Упомянутые в описании и другие стандарты IEC

Overview

IEC 60774-4:2002 specifies the S‑VHS ET (Extended Technology) mode for helical-scan video tape cassette systems using 12.65 mm (0.5 in) magnetic tape on type VHS. The ET mode records an S‑VHS signal format on a standard VHS cassette by switching key recording parameters so that the recorded signal characteristics are equivalent to S‑VHS on S‑VHS tape. Cassettes recorded in S‑VHS ET mode are playable on S‑VHS playback systems and on VHS recorders equipped with the SQPB (S‑VHS quasi-playback) function.

This part of IEC 60774 is intended for equipment designers, test engineers and manufacturers implementing compatibility between S‑VHS recording quality and VHS media.

Key Topics

Signal compatibility: ET mode adjusts recording parameters so S‑VHS signals are reproduced correctly from VHS cassettes.

Applicable systems: Supports both 525 line‑60 field and 625 line‑50 field recordings where specified; recording systems must comply with both VHS and S‑VHS standards.

Pre‑emphasis and compensation filters: The standard provides compensation filter responses and pre‑emphasis frequency responses for the two signal families. Example compensation values include:

525 line/60 field (compensation filter response): 1.0 MHz: –0.2 ±0.3 dB; 2.0 MHz: –0.8 ±0.3 dB; 5.0 MHz: –3.4 ±0.3 dB.
625 line/50 field (compensation filter response): 1.0 MHz: –0.4 ±0.3 dB; 2.0 MHz: –1.3 ±0.3 dB; 5.0 MHz: –5.1 ±0.3 dB.

Clipping levels: White clipping level is specified as 190 % ±10 % (S‑VHS spec notes 210 % ±10 %); dark clipping remains at –70 % ±10 % relative to sync tip.

FM recording head current: Optimum recording current for the FM carrier band shall be set per cassette tape to achieve maximum playback output.

Converted chrominance: Converted chrominance spurious component (fy ± 2fc) is specified at –20 dB to –25 dB relative to the fy playback level (fy = luminance centre frequency).

Cassette discrimination: ET mode is selectable only when a VHS‑standard cassette is detected; playback mode detection uses the FM carrier frequency.

Related Standards

IEC 60774-3:1993 - Helical‑scan video tape cassette system: S‑VHS (reference for terms and baseline S‑VHS parameters).

IEC 61041-1:1990 - Non‑broadcast VTR measurement methods (referenced for red lustre signal definitions).

For implementers, IEC 60774-4:2002 must be used together with the general VHS and S‑VHS parts to ensure complete compliance and interoperability.

IEC 60774-4:2002 PDF

Abstract

Похожие стандарты

Overview

Key Topics

Applications

Related Standards

Технические детали

IEC 60774-5:2004

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