ISO 9525:1988 PDF

Name: ISO 9525:1988 — Cinematography — Recording head gaps for two sound records on 17,5 mm magnetic film — Positions and width dimensions
SKU: ISO 9525:1988
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Cinematography — Recording head gaps for two sound records on 17,5 mm magnetic film — Positions and width dimensions

Название (английский):

ISO 9525:1988

Cinematography — Recording head gaps for two sound records on 17,5 mm magnetic film — Positions and width dimensions

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 2
Дата публикации:: 28 июля 1988 г.
Издание:: ISO IS 9525 edition 1 version 1
ICS:: 37.060.20

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Описание (английский):

This International Standard specifies the lateral positions and width dimensions of the recording heads for two magnetic Sound records and a control track on 17,5 mm Single perforated magnetic recording film. lt also specifies the reproducing velocity of the film travel.

Abstract

Похожие стандарты

Упомянутые в описании и другие стандарты ISO

Overview

ISO 9525:1988 is an international standard developed by the International Organization for Standardization (ISO) that specifies the technical requirements for recording head gaps used in cinematography sound recording. This standard focuses on two sound records on 17.5 mm single-perforated magnetic film, detailing the precise lateral positions and width dimensions of the recording heads. Additionally, it defines the film reproducing velocity to ensure consistent sound playback. First published in 1988 under Technical Committee ISO/TC 36 (Cinematography), ISO 9525:1988 supports uniformity and compatibility in magnetic sound recording for motion pictures.

Key Topics

Recording Head Gaps Specifies the exact physical dimensions and lateral locations of the magnetic recording heads to accommodate two sound tracks and one control track on 17.5 mm magnetic film. The recording head gaps must be aligned perpendicularly (90° ± 3') to the direction of film travel for optimal magnetic sound capture.

Film Reproducing Velocity Establishes that the film runs at either 24 frames per second (approximately 45.6 cm/s or 18 inches/s) or 25 frames per second (approximately 47.5 cm/s or 18.7 inches/s). The standard tolerances allow operating conditions at either speed to maintain sound quality in accordance with ISO 1189.

Sound Tracks and Control Track Usage Defines the usage of two magnetic tracks: either for related or unrelated audio material. For stereophonic programmes, Track 1 commonly carries the left channel, and Track 2 the right channel (from the auditorium perspective). The control track stores auxiliary data or address information in analog or digital format.

Compatibility with Other Standards References ISO 1189:1986 for recorded characteristics of magnetic sound records on motion-picture films, ensuring the audio quality conforms to established parameters.

Applications

ISO 9525:1988 is vital for professionals in the film and cinema sound industry aiming to standardize the magnetic recording of soundtracks on 17.5 mm magnetic film. Practical applications include:

Film Production and Post-Production Ensures sound recording equipment aligns magnetic heads accurately for reliable and high-quality sound on motion-picture film, facilitating efficient stereo or multi-channel audio tracks.

Sound Equipment Manufacturing Guides manufacturers in designing and producing magnetic recording heads and related devices compatible with 17.5 mm motion-picture film formats.

Archival and Restoration Provides reference dimensions and playback velocities needed for accurate reproduction of archived film soundtracks using magnetic film technology.

Quality Control and Testing Offers measurement criteria for verifying recording head gaps and film speeds to comply with international standards, ensuring consistent sound quality across different systems and regions.

Related Standards

ISO 1189:1986 – Specifies recorded characteristics for magnetic sound records on 35 mm motion-picture film, which ISO 9525 aligns with for maintaining consistent audio quality.

Other ISO Cinematography Standards – ISO/TC 36 develops various standards related to film and cinematography, providing comprehensive technical frameworks for motion-picture production and reproduction.

Keywords: ISO 9525, magnetic film sound recording, cinematography standards, recording head gaps, 17.5 mm film, soundtracks, control track, film reproducing velocity, stereophonic sound, ISO sound standards.

ISO 9525:1988 PDF

Abstract

Похожие стандарты

Overview

Key Topics

Applications

Related Standards

Технические детали

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