Overall electro－acoustic frequency response for reproduction of magnetic stripe sound records on 70mm motion picture release prints－Reproduction characteristics

This standard specifies the electro-acoustic frequency response characteristics of the full sound reproduction (or monitoring) system of the magnetic soundtrack of 70mm film coated magnetic copies. This standard applies to the main sound channel system of the mixing studio, standard projection room and indoor theater dedicated to movies, and also applies to the sound reproduction of the 35mm magnetic six-track in the 70mm film with sound and picture separated. GB/T 14000-1992 Electro-acoustic frequency response characteristics of the sound reproduction of the magnetic soundtrack on the 70mm film coated magnetic release copy GB/T14000-1992 Standard download decompression password: www.bzxz.net
This standard specifies the electro-acoustic frequency response characteristics of the full sound reproduction (or monitoring) system of the magnetic soundtrack of 70mm film coated magnetic copies. This standard applies to the main sound channel system of the mixing studio, standard projection room and indoor theater dedicated to movies, and also applies to the sound reproduction of the 35mm magnetic six-track in the 70mm film with sound and picture separated.

National Standard of the People's Republic of China
70 mm motion-picture release prints
Overall electro-acoustic frequency response for reproduction of magnetlc stripe sound records an 70 mm motion-picture release prints-Reproduction characteristics of magnetic soundtracks GB/T14000--92
This standard refers to and adopts the international standard ISO 2969-1987°B-loop electro-acoustic frequency response characteristics and its measurement conditions for motion-picture recording control rooms and indoor cinemas.
Subject content and scope of application
This standard specifies the electro-acoustic frequency response characteristics of the overall reproduction (or monitoring) system of magnetlc stripe sound records of 70 mm motion-picture release prints. This standard is applicable to the main channel system of the mixing studio dedicated to movies, standard projection room and indoor cinema, and also to the reproduction of 35 mm magnetic six-track sound in 70 mm films with separated sound and picture. 2 Terminology
2.1 Full sound reproduction system The entire electro-acoustic system used to restore the sound of a film to a sound field in a movie mixing studio, projection room, or indoor theater. It is usually divided into two parts: A-chain and B-chain. As shown in Figure 1,||tt| ... 2.4 Wide range magnetic sound track Approved by the State Administration of Technical Supervision on December 17, 1992 and implemented on August 1, 1993: comGB/T14000-92 A magnetic sound track without pre-compensation compared with conventional magnetic sound track. It uses the "" curve specified in this standard as the B-ring characteristic, that is, it reproduces the sound without pre-compensation. This kind of soundtrack generally needs to be processed by noise reduction when recording and reproducing. 2.5 Pre-emphasis magnetic soundtrack Conventional film magnetic soundtrack, also known as pre-compensated magnetic soundtrack, uses the "n curve" specified in this standard as the 1 ring characteristic, and reproduces the sound under the condition of decompensation.
2.6 Electro-acoustic frequency response The frequency response characteristic expressed in decibels of the ratio of the sound pressure generated by the test signal in a given frequency range from the A ring to the B ring sound field at a specified point relative to the sound pressure at any reference frequency (usually 1kHz). 3 Electro-acoustic frequency response characteristics
The frequency response characteristics of the A ring and B ring of the wide-band magnetic soundtrack are shown in Tables 1 and 2. 3.1
Frequency response
Center frequency
.- 2. 0
“x\ characteristic
GB/T14000—92
Figure 2 Frequency response characteristics of A-ring and B-ring of wideband soundtrack12510
3.2 The characteristics of A-ring when the pre-compensated magnetic soundtrack is reproduced in a cinema with B-ring of “X\ characteristic” are shown in Table 2 and Figure 3 (attached with B-ring \X\ characteristic).
Frequency response
“x\ characteristic
Frequency response
Center frequency
- 24 F
GB/T 14000—92
Continued Table 2
“” characteristic
Figure 3 Frequency response characteristics of A-ring when the pre-compensated magnetic soundtrack is reproduced in a cinema with B-ring of \X\ characteristic
[2 50 heart
GH/T1400092
Appendix A
Total electro-acoustic frequency response characteristics of magnetic soundtrack reproduction (supplementary)
A1 The total electro-acoustic frequency response characteristics of the (A+B) loop during pre-compensated magnetic soundtrack and wide-band magnetic soundtrack reproduction are shown in Table A1, Figure A1 and Figure A2.
Frequency response
Center frequency
Pre-compensated magnetic soundtrack
Overall sound reproduction characteristics
-- 2, 0
In \x\characteristic cinema
Wideband magnetic soundtrack
Overall sound reproduction characteristics
Frequency response
Center frequencywww.bzxz.net
12 500
GB/T14000—92
Continued Table Al
In *x\characteristic cinema
Pre-compensated magnetic soundtrack
Overall sound reproduction characteristics
-11, D
100[80
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Compensated magnetic sound track in B ring is "" characteristic cinema sound reproduction overall characteristics of electro-acoustic frequency response
Wideband magnetic sound track
Total sound reproduction characteristics
Additional instructions:
GB/T14000—92
10 000
Wideband magnetic sound track in \X" characteristic cinema sound reproduction overall characteristics of electro-acoustic frequency response This standard is proposed by the Ministry of Radio, Film and Television of the People's Republic of China. This standard is under the jurisdiction of the China Film Science and Technology Research Institute of the Ministry of Radio, Film and Television. This standard is drafted by the China Film Science and Technology Research Institute of the Ministry of Radio, Film and Television. The main drafters of this standard are Yao Shirong, Shuai Jin. Hz
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