ISO 4834:1997 PDF

Cinematography — Magnetic sound test films excluding striped release prints — Basic technical characteristics

Название (английский):

ISO 4834:1997

Cinematography — Magnetic sound test films excluding striped release prints — Basic technical characteristics

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 8
Дата публикации:: 11 декабря 1997 г.
Издание:: ISO IS 4834 edition 2 version 1
ICS:: 37.060.20

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Описание (английский):

This International Standard specifies basic technical characteristics for the magnetic sound test films for checking, adjusting and measuring sound reproducing channels of dubbing motion-picture installations. It also specifies types and technical characteristics of magnetic test films made on 35 mm, 17,5 mm and 16 mm motion-picture films. This International Standard includes test films intended for the checking, adjusting and measuring of a) inclination angle (azimuth) of the magnetic head gaps; b) output level balance of multi-channel systems; c) frequency response of the sound reproduction channel; d) non-uniformity of film velocity (flutter).

Технические детали

Технический комитет: ISO/TC 36 - Cinematography
SKU: ISO 4834:1997

Abstract

Overview

ISO 4834:1997 defines the basic technical characteristics for magnetic sound test films used to check, adjust and measure sound reproducing channels in dubbing motion-picture installations. The standard covers test films made on 35 mm, 17.5 mm and 16 mm motion‑picture film and excludes striped release prints. It specifies the test functions (azimuth, reference level, frequency response and flutter), tolerances, signal formats and production/identification requirements for reliable calibration and evaluation.

Key topics and requirements

Test functions covered
- Azimuth (inclination angle of magnetic head gaps)
- Output/reference level balance for single- and multi-channel systems
- Frequency response of the sound reproduction channel
- Non‑uniformity of film velocity (wow and flutter)
Film formats and physical requirements
- Applies to 35 mm, 17.5 mm and 16 mm film; cutting/perforation and record location follow ISO 491, ISO 69, ISO 162 and ISO 4242 as applicable
- Test films shall be splice‑free unless splice is part of the test
- Frame rates: 24 or 25 fps (other rates allowed if stated)
- Containers must be labelled with function, base material (acetate or polyester), thickness, frame rate, date and place of recording
Signal and calibration specifics
- Two historical calibration formats (Type 185 and Type 320) are described in the introduction: Type 185 (185 nWb/m, 60 Hz mains orientation) and Type 320 (320 nWb/m, 50 Hz mains orientation); the standard establishes a universal compromise format
- Frequency and level tolerances, output uniformity and flutter limits are specified (see standard tables for numerical tolerances, e.g., azimuth tolerance ±1 angular minute, flutter target

Overview

Key topics and requirements

Test functions covered
- Azimuth (inclination angle of magnetic head gaps)
- Output/reference level balance for single- and multi-channel systems
- Frequency response of the sound reproduction channel
- Non‑uniformity of film velocity (wow and flutter)
Film formats and physical requirements
- Applies to 35 mm, 17.5 mm and 16 mm film; cutting/perforation and record location follow ISO 491, ISO 69, ISO 162 and ISO 4242 as applicable
- Test films shall be splice‑free unless splice is part of the test
- Frame rates: 24 or 25 fps (other rates allowed if stated)
- Containers must be labelled with function, base material (acetate or polyester), thickness, frame rate, date and place of recording
Signal and calibration specifics
- Two historical calibration formats (Type 185 and Type 320) are described in the introduction: Type 185 (185 nWb/m, 60 Hz mains orientation) and Type 320 (320 nWb/m, 50 Hz mains orientation); the standard establishes a universal compromise format
- Frequency and level tolerances, output uniformity and flutter limits are specified (see standard tables for numerical tolerances, e.g., azimuth tolerance ±1 angular minute, flutter target

ISO 4834:1997 PDF

Технические детали

Abstract

Overview

Key topics and requirements

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Abstract

Overview

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