This standard specifies the position and width of the gap between the recording head and the sound reproduction head for three-track, four-track and six-track on 35mm magnetic discs, and also specifies the head azimuth, the running direction of the magnetic disc and the direction of the magnetic coating. This standard applies to the recording and sound reproduction of three-track, four-track and six-track on 35mm magnetic discs for movies. GB/T 4637-1994 Position and width of the gap between the recording head and the sound reproduction head for three-track, four-track and six-track on 35mm magnetic discs GB/T4637-1994 Standard download decompression password: www.bzxz.net
This standard specifies the position and width of the gap between the recording head and the sound reproduction head for three-track, four-track and six-track on 35mm magnetic discs, and also specifies the head azimuth, the running direction of the magnetic disc and the direction of the magnetic coating. This standard applies to the recording and sound reproduction of three-track, four-track and six-track on 35mm magnetic discs for movies.

National Standard of the People's Republic of China
Head gaps and sound records for three-tfour-,or six-track magnetic sound recordson 35 mn motlon-plcture film contuiningno picture--Positlons and width dimensionsGB/T 4637--94
GB4637\u201484
Replaces G3 5876--86
GB 5877 --26
This standard is equivalent to the international standard IS0162\u20141985Head gaps and sound records for three-tfour-,or six-track magnetic sound recordson 35 mm motlon-plcture film contuiningno picture--Positlons and width dimensionsGB/T 4637--94
GB4637\u201484
Replaces G3 5876--86
GB 5877 --26
This standard is equivalent to the international standard IS0162\u20141985Head gaps and sound records for three-tfour-,or six-track magnetic sound recordson 17.5 mm motlon-plcture film contuiningno picture--Positlons and width dimensions 1 Subject content and scope of application
This standard specifies the position and width of the gaps of the recording heads and playback heads on 35mm magnetic films with three tracks, four tracks and six tracks, and also specifies the head azimuth, the running direction of the magnetic film and the direction of the magnetic coating. This standard applies to the recording and playback of three tracks, four tracks and six tracks on 35mm magnetic films dedicated to movies. 2 Terminology
Magnetic film
Special magnetic sound carrier made according to the geometric dimensions and perforation specifications of movie films. 3 Direction of magnetic coating
The running direction of the magnetic film is shown in Figures 1 to 3, with the magnetic coating facing upward. 4: Head azimuth
The angle between the center line of the gap of the recording or playback head and the running direction of the magnetic film should be 90\u00b0\u00b13\u00b0, and the center line of the gap of the multi-channel magnetic head must be calibrated on the straight line.
5 Position and width of the head gap
The position and width of the gap between the recording head and the playback head are shown in Figures 1 to 3 and Tables 1 to 3. 6 Track usage
6.1 Mono recording - usually uses the first track of the three tracks for recording (as shown in Figure 1 and Table 1). 6.2 The usage of stereo recording tracks is as follows, approved by the National Technical Supervision Bureau on December 28, 1994 and implemented on August 1, 1995
On channel
Left channelWww.bzxZ.net
GB/T4637-94
Three-channel format
Middle channel
Four-channel format
Middle channel
Right channel
Right channel
(ambient channel)
Note: For two-way stereo with phase-related materials, two adjacent tracks should be used for recording (preferably three-track format 3 Table 1 Three-track magnetic gap and track size (as shown in Figure 1) Size
H (reference)
5. 0\u00b1 0. 05
8. 6\u00b10. 05
8. 9\u00b10, 05
17. 8\u00b10. 06
34.97
+line
Magnetic transport direction
Figure 1
Table 2 Dimensions of four-track magnetic head gap and sound track (as shown in Figure 2)4
H (test)
3.B+0. 05
7. 9\u00b10. 05
6. 4\u00b10, 05
12, 8\u00b10,05
19, 2\u00b10.05
34. 97
Co-aligned track
Group chip certificate direction
GB/T 4637\u201494
Figure 2
Headway belt
Center
Six-track magnetic head joint and sound size (as shown in Figure 3) 3
H (numerical test)
Moving
The running direction of the meter
Figure 3
2- 54\u00b1 0. 05
7. 34 \u00b10. 05
4.06\u00b10.05
8. 12 \u00b10. 05
12.18\u00b1.0.05
16.24\u00b10.05
20. 30 +0.05
34.97
Central
Energy
GB/T 4637-94
In actual work, there are many different ways to use the six-track format, so the use method of the track should be clearly marked on each disk.
Note: The number and use method of the track should be marked on the reel and the box. Additional instructions
This standard was proposed by the Ministry of Radio, Film and Television of the People's Republic of China and is under the jurisdiction of the China Film Science and Technology Research Institute of the Ministry of Radio, Film and Television. This standard was drafted by the China Film Science and Technology Research Institute of the Ministry of Radio, Film and Television.
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