1、SMPTE RECOMMENDED PRACTICE RP 67-2002 Revision of RP 67-1997 Specifications for Buzz-Track Test Film for 16-mm Motion- Photographic Type Picture Audio Reproducers, - Page 1 of 2 pages 1 Scope This practice specifies a test film for checking the lateral position of the sound scanning beam in 16-mm mo
2、tion-picture photographic audio reproducers. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this practice. At the time of publication, the editions indicated were valid. All standards are subject to revision, and part
3、ies to agreements based on this practice are encouraged to investigate the possibility of applying the most recent edition of the standards indicated below. ANSVSMPTE 109-1998, Motion-Picture Film (16-mm) - Perforated 1 R and 2R SMPTE 223M-2001, Motion-Picture Film - Safety Film 3 Testfilm 3.1 The t
4、est film shall have originally recorded 300-Hz and 1000-Hz signal tracks on opposite sides of the central exposed strip as shown in figure 1. 3.2 The position of the tracks shall be in accordance with the dimensions given in table 1 3.3 The central exposed strip and the exposed portions of the two s
5、ignal tracks shall have a density Of 1.0 + 0.4 - 0.0. 4 Film stock 4.1 The film stock, preferably polyester, shall be splice-free, of the low-shrinkage, safety type in compliance with SMPTE 223M, and cut and perforated in accordance with long-pitch dimensions specified in ANSVSMPTE 109. 4.2 Triaceta
6、te film stock shall be cut and perforated in accordance with short-pitch dimensions specified in ANSVSMPTE 109. The stock shall have a maximum lengthwise shrinkage of 0.50% when tested as follows: At least 20 strips of film approximately 31 inches in length shall be cut for measurement of shrinkage.
7、 After normal development and drying (not over 80F 27OC), the strips shall be placed at least U4 in apart in racks and kept for seven days in an oven maintained at 120F (49C) and a relative humidity of 20%. The strips shall then be removed, reconditioned thoroughly to 50% relative humidity at 70F (2
8、1“C), and the shrinkage measured by a suitable method. The percent shrinkage shall then be calculated on the basis of deviation from the nominal dimension for the length of 100 consecutive perforation intervals given in ANSVSMPTE 109. Copyright O 2002 by the THE SOCIETY OF MOTION PICTURE AND TELEVIS
9、ION ENGINEERS 595 W. Hartxiale Ave., White Plains, NY 10607 (914) 761-1100 Approved July 26,2002 RP 67-2002 c- REFERENCE EDGE 5 Identification Each test film shall be identified by a suitable identification marking. This marking shall be printed lengthwise in the picture area and the spacing between
10、 consecutive titles shall be approximately 12 in (30 cm). NOTE - A test film conforming to this practice is available from the Society of Motion Picture and Television Eng ne ers. 1000 Ht UNIFORMLY OPAQUE STRIP B- A- Table 1 - Dimensions I Dimensions Inches Mil I met ers I 0.6060 + 0.0 15.392 +_ :,3 - 0.0005 A B 0.5340 + 0.0005 - 0.0 O 013 o:o 13.564 C 0.022 min 0.56 min D 0.022 min 0.56 min Page 2 of 2 pages
