1、 1 Scope 1.1 This standard specifies the lateral positions and width dimensions of two 3.81 mm (0.150 in) magnetic audio records and a control track on 16-mm single-perforated magnetic recording film. 1.2 This standard also specifies the reproducing velocity of the film travel. 2 Audio record 2.1 Th
2、e lateral location and width of each magnetic audio record shall be as specified in figure 1 and table 1. 2.2 The recording shall be made so that the azimuth of each record is at an angle of 90 5 to the reference edge of the film. 2.3 With the direction of travel as shown in figure 1, the magnetic c
3、oating shall be on the surface toward the observer. 3 Reproducing speed The recording shall be made so that the audio records will reproduce properly at 24 perforations per second (approximately 11 m 36 ft per minute or 183 mm 7.2 in per second), which is 24 frames per second. 4 Track usage 4.1 For
4、recording single records, the center track position shall be used. However, for international exchange, interchangeability is facilitated by placing identical information on both tracks. 4.2 For recording stereo programs, the center track position shall be used for the left-hand channel. 4.3 For rec
5、ording two languages, the center track shall be used for the primary language and the edge track position shall be used for the secondary language. 4.4 The control track shall be used for recording other information and for address systems in analog or digital form. Page 1 of 3 pages SMPTE 210M-2004
6、 Revision of SMPTE 210M-1999 Copyright 2004 by THE SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 595 W. Hartsdale Ave., White Plains, NY 10607 (914) 761-1100 ApprovedNovember 8, 2004SMPTE STANDARD for Motion-Picture Film (16-mm) Magnetic Audio Records Two Records on 16-mm Magnetic Film SMPTE 21
7、0M-2004 Page 2 of 3 pages Figure 1 Location of audio records Table 1 Specifications Dimensions Millimeters Inches A 0.46 0.05 0.018 0.002 B 7.95 0.05 0.313 0.002 C 13.89 0.05 0.547 0.002 D 3.81 + 0 0.10 0.150 + 0 0.004 E 0.71 + 0 0.10 0.028 + 0 0.004 F 5.95 nom 0.234 nom G1)13.45 nom 0.529 nom H 15.
8、95 ref 0.628 ref 1) Dimension G deviates from standard conversion procedures to reflect the practice in countries using the English system. SMPTE 210M-2004 Page 3 of 3 pages Annex A (informative) Additional data A.1 Record width The width of the recorded area must be measured with great care, as it
9、enters directly into the calculation of flux per unit track width. When the recording head gap is narrower than the width of the coating or stripe, as is normal for all motion-picture test films, there is a measurement complication involving the uncertainties both in seeing the track and in determin
10、ing the recording fringing. If the recording head is available, the track width is best measured indirectly by measuring the gap width and adding to this dimension twice the thickness of the test record magnetic coating. This correction will usually be 0.0003 in to 0.0006 in (8 m to 15 m). If the re
11、cording head is unavailable, the recorded record may be made visible by the use of a carbonyl iron suspension. Care should be taken to apply the minimum quantity that makes the recording visible, so that the developed image is not wider than the actual recorded area. A.2 Reproducing head gap width I
12、f precision measurements or calibrations are to be made on magnetic audio records made in accordance with this standard, reproducing head gaps of the same width dimension or wider than the recorded track must be used to prevent edge effects or fringing. A.3 Erase heads Erasing head gaps used to eras
13、e the records covered in this standard should be substantially wider than the records. A.4 Picture-sound synchronization The film is used for audio records only. Any accompanying picture is on a separate photographic film. When audio records are intended to be used in synchronization with pictorial
14、material found on a separate film, the picture-sound relationship should be in accordance with SMPTE RP 25. A.5 Magnetic coating The dimensions of the magnetic coating are not specified, but it is assumed that the coating is wide enough to permit the placement of the audio records in accordance with this standard. Annex B (informative) Bibliography SMPTE 109-2003, Motion-Picture Film (16-mm) Perforated 1R and 2R SMPTE RP 25-1995, Audio and Picture Synchronization on Motion-Picture Film Relative to the Universal Leader for Magnetic and Photographic Records
