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है”ह”ह

IS 12773 (1989): Cinematography - Recorded characteristicsof magnetic sound record on 35 mm motion picture magneticsfilm [MED 32: Photographic Equipment]

IS 12773 : 1989

Indian Standard

CINEMATOGRAPHY - RECORDED CHARACTERISTICS OF MAGNETIC SOUND

RECORD ON 35 mm MOTION-PICTURE MAGNETIC FILM - SPECIFICATION

UDC 778’534 - 455 : 771’531.351

@ BIS 1991

BUREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

March 1991 Price Group 1

Cinematographic Equipment Sectional Committee, ETDC 47

FOREWORD

This Indian Standard was adopted by the Bureau of Indian Standards on 8 September 1989 after the draft finalized by the Cinematographic Equipment Sectional Committee had been approved by the Electrotechnical Division Council.

While preparing this standard assistance has been derived from the following:

i) IS0 8590-1985 Cinematography - Audio Records on 35 mm and 70 mm motion-picture release prints with magnetic stripes - recorded characteristics

ii) ANSI PH22 -208M-1984 Motion-picture film ( 35 mm ) - recorded characteristic - magnetic audio records issued by American National Standard Institute ( USA ).

For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance with IS 2 : 1960 ‘Rules for rounding off numerical values (revised )‘. The number of signi- ficant places retained in the rounded off value should be the same as that of the specified value in this standard.

IS 12773 : 1989

Indian Standard

CINEMATOGRAPHY - RECORDED CHARACTERISTICS OF MAGNETIC SOUND

RECORD ON 35 mm MOTION-PICTURE MAGNETIC FILM - SPECIFICATION

1 SCOPE

1.1 This standard specifies, for studio use, the recorded characteristics of magnetic audio records on 35 mm motion-picture magnetic film when reproduced at the nominal speed of 24 frames ( 457 mm > per second.

2 RECORDED CHARACTERISTLC

2.1 With a constant amplitude sine-wave applied to the input of the recording system, the relative characteristic in effective values of the short-circuit magnetic flux versus frequency shall decrease with increasing frequency proportionately to the imoedance of a combination of capacitance and resistance having time constants of T = 35 ps and 3 180 ps ( see the note ). The characteristic t;Fiiuda above is obtained by the following

The corresponding reproducing characteristic is that which gives a flat response when reproducing a sound track recorded with the relative short- circuit flux level defined above.

3 TOLERANCES

3.1 Magnetic audio records shall be recorded to the characteristic specified in 2 within the tole- rances given in Table 1.

Table 1 Relative Magnetic Flux Level

( Clause 3.1 )

Frequency dR

P-IZ 40 5o 63

1 + ( 2nTh)2f2 -.___

‘% = &- lo log,0 I--+ I]-[ ( 2n,r, )3fm2]

where

Lv# is the recorded relative magnetic flux level, in decibels;

f is the frequency, in hertz;

-rl is the time constant of 3 180 ps;

oh is the time constant of 35 ps; and

C, is a constant calculated to make L+ = 0 at the reference frequency of I 000 Hz.

The approximate numerical values are given in the table, with the values of the recorded magnetic characteristic normalized to 1 000 Hz.

X0

100 125 160 200 250 315 400 500 630 800

I 000 I 250 1 600 2 000 2 500 3 150 4 000 5 000

NOTE - A time constanl such as that defined by a 6 300

frequency response curve is shorthand notation 8 000

having the shape defined &y-a time constant of one 10 000 or more microseconds. ‘l‘hts is a convenient way of defining a response curve, and is not intended as

12 500

a recommended electrical circuit. 16 000

4.28 3’20 2’31 1’62 1’16 0’83 0’59 0’45 0’35 0’28 0’22 0’18 0,13 0’07 0.00

- 0.12 - 0’31 - 0.58 - 0.96 - 1.51 - 2.30 - 3.25 - 4.46 - 5,93 - 7.47 - 9.13 - 11.07

c--

+

2.0 2.0 1’5 1’3 1’0 1’0 1.0 I .o 1’0 I.0 1’0 1.0 1.0 1.0 1.0 1.0 1.0 1’0 1’0 1.0 1’0 1.0 1.3 1’5 2.0 2.0 2.0

Tolerances -h___7

- 4.0 4.0 3’0 2.0 1.0 1.0

1'0 1.0 I.0 1’0 1.0 1’0 1’0 1.0 10 1.0 1’0 1.0 1’0 1.0 1.0

1’0 I.0 2.0 2’5 3.5 3’5

--

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Dot : No. ETD 47 ( 2889 )

Amendments Issued Since Publication

Amend No. Date of Issue Text Affected

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