1、SMPTE STANDARD for Motion-Picture Film (35-mm) - Projector Usage - Release Prints Having Four Perforations per Frame SMPTE 194-2002 Revision of ANSVSMPTE 194-1997 Page 1 of 2 pages 1 Scope 1.1 This standard specifies the position of the emulsion for 35-mm motion-picture release prints having four pe
2、rforations per frame and the position of the magnetic striping relative to the projector lens. 1.2 The standard also specifies the rate of projection for systems defined in 1.1 and the relevant standards on location of the picture and audio records. 2 Position of photographic emulsion and magnetic s
3、triping 2.1 The photographic emulsion shall be on the side of the film which faces away from the projector lens. The projectable image area is specified in SMPTE 195. 2.2 The magnetic striping shall be on the side of the film which faces the projector lens. Relevant standards on audio records are li
4、sted in annex B. PHOTOGRAPHIC AUDIO PRINT MAGNETIC AUDIO PRINT View as Seen through Film toward Lens Figure 1 - Photographic and magnetic audio prints Copyright O 2002 by THE SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 595 W. Harsdale Ave., White Plains, NY 10607 (914) 761-1100 Approved July
5、26,2002 SMPTE 194-2002 3 Projection frame rate The standard frame rate for motion-picture projection is 24 frames per second. However, it is recognized that nonstandard frame rates are sometimes used for specific applications. For example, 24, 25, or 30 frames per second may be used for motion-pictu
6、res intended for television, higher or lower frame rates may be used for special effects and analysis, and nonstandard rates may be used for special motion-picture systems. The use of nonstandard frame rates requires notification and agreement of all parties concerned with the use of the particular
7、film. 4 Framing adjustment It is customary to provide a vertical framing adjustment movement of at least 0.31 5 in (8.00 mm) above and below the normal image position, as specified in SMPTE 195. Annex A (informative) Positioning of audio records When the audio records are reproduced, the distance fr
8、om the audio-scanning point to the center of the projector aperture shall be adjusted to bring the picture and sound into synchronism for the average observer. Since sound travels at a rate of about 1100 ft (335 m) per second (approximately 50 ft 15 m in 1/24 second), synchronism can be achieved by
9、repositioning the audio record in the projector one frame for every 50 ft from the average observer. Annex B (informative) Bibliography SMPTE 40-2002, Motion-Picture Film (35-mm) - Release Prints - Photographic Audio Records SMPTE 137-2000, Motion-Picture Film (35-mm) - Release Prints - Four Magnetic Audio Records SMPTE 195-2000, Motion-Picture Film (35-mm) - Motion-Picture Prints - Projectable Image Area Page 2 of 2 pages
