Audio records on 70mm motion-picture release prints with magnetic stripes－Recorded characteristics

This standard specifies the audio-recording response characteristics of 70mm film magnetic release copies at a film rate of 24 frames (570mm)/s. This standard applies to 70mm film magnetic release copies and also to 35mm magnetic sheets in 70mm film release copies with sound and picture separated. GB/T 13155-1991 Recording frequency response characteristics of magnetic soundtracks on 70mm film magnetic release copies GB/T13155-1991 Standard download decompression password: www.bzxz.net
This standard specifies the audio-recording response characteristics of 70mm film magnetic release copies at a film rate of 24 frames (570mm)/s. This standard applies to 70mm film magnetic release copies and also to 35mm magnetic sheets in 70mm film release copies with sound and picture separated.

Audio records on 70 mm arotion-pleture release prints with magnetic stripes-Recorded characteristics",
National Standard of the People's Republic of China
Audio records on 70 mm arotion-pleture release prints with magnetic stripes-Recorded characteristics
GB/T 13155- 91
This standard is equivalent to the international standard IS085901985 "Recording characteristics of 35mm and 70mm film magnetic release copies". 1 Subject content and applicable scope
This standard specifies the recording characteristics of 70mm film magnetic release copies with a frame rate of 21 frames (57mm)/s. This standard applies to 70mm film magnetic release copies and also to 35mm film in 70mm film release copies with sound and picture separated.
2 Recording characteristics
The frequency characteristics of the residual magnetic flux of the recording track at the input end of the recording system using an equal-frequency sine wave signal should be consistent with the impedance characteristics of the parallel combination network with a double time constant: Ii.=3180m,th35us. In practical application, the expression of its relative characteristics is:
L, = C: -. 10 lx
1+(2x,)3f2
1+1/[(2 yuan)\f)
Where: 7.-- Relative residual flux response characteristics recorded on the carrier, dB: f-frequency, lz;www.bzxz.net
-3180 time constant;
-35μ5 time constant:
-calculation constant, the reference frequency is 1000Hz, L+-0 dB, the approximate value of C. is 0.19R. The approximate value of the recorded frequency response characteristics is shown in Table [. Table 1 Recording frequency response characteristics (approximate value)
Relative residual flux characteristics recorded on the carrier Hz
Approved by the State Administration of Technical Supervision on September 16, 1991 dB
Implemented on June 1, 1992
10 000
3 Corresponding repetitive magnetic flux frequency response characteristics
GB/T13155—91
Continued Table 1
Relative repetitive magnetic flux characteristics recorded on the sound source dB
— 0. 31
When the sound track recorded according to the relative residual magnetic flux frequency response characteristics specified in Chapter 2 is reproduced by the corresponding standard sound reproduction system, a semi-straight frequency should be obtained.
4 Allowable error
When the sound track recorded according to the relative residual magnetic flux frequency response characteristics specified in Chapter 2 is reproduced by the corresponding standard sound reproduction system, its tolerance should not exceed the range given in [.
Method: Within the given tolerance range, avoid the positive difference (or negative difference) in the low frequency band and the negative difference (or positive difference) in the commercial frequency band appearing at the same time, dB
0. 04 0. 05
Additional Notes:
GB/T 13155—91
Figure 1 Permissible Error Range of Recording Level
This standard is proposed by the Ministry of Radio, Film and Television of the People's Republic of China. This standard is drafted by the China Film Science and Technology Research Institute of the Ministry of Radio, Film and Television. 456.3
1c12. 5 16 kHz
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