SMPTE RP 63-2002 Specifications for Sound-Focusing Test Film for 16-mm Audio Reproducers Photographic Type《16 mm还音器(摄影型)声聚焦试验片规范》.pdf

1、SMPTE RECOMMENDED PRACTICE RP 63-2002 Revision of RP 63-1997 Specificat ions for Sound-Focusing Test Film for 16-mm Audio Reproducers, Photographic Type Page 1 of 2 pages 1 Scope This practice specifies a test film for use in focusing the scanning beam of 16-mm motion-picture photographic audio repr

2、oducers operating at 36 ft (11 m) per minute. 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 par

3、ties to agreements based on this practice are encouraged to investigate the possibility of applying the most recent edition of the standards indicated below. AES 6-1 982, Method for Measurement of Weighted Peak Flutter of Sound Recording and Reproducing Equipment ANSVSMPTE 109-1998, Motion-Picture F

4、ilm (16-mm) - Perforated 1 R and 2R SMPTE 41-1999, Motion-Picture Film (16-mm) - Prints - Photographic Audio Records SMPTE 223M-2001, Motion-Picture Film - Safety Film 3 Test film signal 3.1 Frequency The audio record on the film shall reproduce at a frequency of 7000 Hz rt 100 Hz (type A) or 5000 H

5、z f 1 O0 Hz (type B) when the linear speed of the film is 24 perforations per second or approximately 36 ft per minute (7.2 in or 18.3 cm per second). 3.1.1 TypeA A film with a 7000-iiz record to be used by manufacturers and laboratories, for precise adjustment of the sound-focusing system. 3.1.2 Ty

6、pe B Afilm with a5000-Hz record to be used when simpler instruments are available or when lower quality is adequate, for quick adjustment of the sound-focusing system. Copyright O 2002 by THE SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 595 W. HatWale Ave., White Plains, NY 10607 (914)761-1100

7、 Approved July 26,2002 RP 63-2002 3.2 Audio record The location and dimensions of the recorded audio record shall be in accordance with SMPTE 41. 3.3 Recording The film shall have an originally recorded, vanable-density audio track. The track shall be heavily overmodulated and developed to high cont

8、rast so that it is essentially a square-wave track. The signal level shall not fluctuate more than f 0.5 dB within the test film length. 3.4 Flutter The weighted peak flutter of the audio record shall not exceed 0.1 % when measured in accordance with AES 6. 3.5 Azimuth The azimuth of the audio recor

9、d shall be 90“ f 3 to the reference edge of the film. 4 Filmstock 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 In the ev

10、ent that triacetate film stock is used, it shall be splice-free and 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. After normal development and drying (not over 80F 27“

11、C), the strips shall be placed at least 1/4 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, ILUIUIIW LIWTUU io 5% relative hiiiiditj at 7“F (ZI“C), and the shrinkage measured by a suitable method. The per

12、cent 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. _ .-A *Le - 5 Identif ication 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 consecutive titles shall be approximately 12 in (30 cm). NOTE - Test films made in accordance with this practice are available from the Society of Motion Picture and Television Engineers. Page 2 of 2 pages