1、 STD-SMPTE RP 64-ENGL 1779 W 8357403 0003575 542 SMPTE RECOMMENDED PRACTICE RP 64-1 999 Revision of RP 64-1994 Specifications for Audio-Focusina e Test Film for 35-mm Audio Reproducers, Photographic Type 1 Scope 3.3 Audio record This practice specifies a test film for use in focusing the scanning b
2、eam of 35-mm motion-picture photographic audio reproducers operating at 90 ft (27.4 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
3、valid. All standards are subject to revision, and parties to agreements based on this practice are encouraged to investigate the possibility of applying the most recent edition of the standards indicated below. ANSI 54.3-1982 (R1992), Method for Measurement of Weighted Peak Flutter of Sound Recordin
4、g and Reproducing Equipment ANSVSMPTE 40-1 997, Motion-Picture Film (35-mm) I 1 - Release Prints - Photographic Audio Records ANSVSMPTE 139-1 996, Motion-Picture Film (35- mm) - Perforated KS ANSVSMPTE 223M-1996, Motion-Picture Film - Safety Film 3 Test film signal The location and dimensions of the
5、 audio record shall be in accordance with ANSVSMPTE 40. 3.4 Recording The film shall be a print from an original negative and shall contain a sinusoidal, variable-area record re- corded at 1 dB below 100% modulation. The variation in amplitude shall not be more than k 0.5 dB. 3.5 Flutter The weighte
6、d peak flutter of the audio record shall not exceed f 0.05% when measured in accordance with ANSI 54.3. 3.6 Azimuth The azimuth of the audio record shall be 90“ I 3 to the reference edge of the film. 4 Film stock The film stock, preferably polyester, shall be splice- free, of the low-shrinkage safet
7、y type in compliance with ANSVSMPTE 223M, and cut and perforated in accordance with long-pitch dimensions specified in ANSIEMPTE 139. 3.1 Frequency 5 Identification The audio record on the film shall reproduce at a frequency of 1 O kHz k 1 O0 Hz when the linear velocity of the film is 96 perforation
8、s per second, which is approximately 90 ft (27 m) per minute (1 8 in 45.7 cm per second). 3.2 Distortion The total harmonic distortion of the recorded signals shall not exceed 1 Yo. Copyright O 1999 by the SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 595 W. Hartsdale Ave., White Plains, NY 106
9、07 (91 4) 761 -1 100 Each test film shall be identified by a suitable identifi- cation marking. This marking shall be printed length- wise in the central portion of the film and the spacing between consecutive titles shall be approximately 12 in (30 cm). NOTE - Test films conforming to this practice are avail- able from the Society of Motion Picture and Television Engineers. Approved April 22, 1999
