Specifications

8-3
8.2 Setting Digital Soundhead Delay
On a Dolby Digital print, the digital sound data is located 6 frames in advance of the
analog soundtrack, and 26 frames in advance of the picture. When the Digital
Soundhead is mounted above the analog soundhead (as with the Cat. No. 700) a
delay is necessary in order to synchronize the digital soundtrack with the analog
track and the picture. In the CP500, this delay is set by entering the number of film
perforations, within the range from 016 perfs (approximately 170 ms delay) to 528
perfs (approximately 5.33 seconds). The minimum is set by signal propagation
delays within the CP500 decoding process.
Soundhead delay may be determined in either of two ways: static and dynamic.
8.2.1 Static
1. Thread a length of Cat. No. 1010 Digital Soundhead alignment test film such
that the “bullet” frame (perf 106) is located in the picture gate, and perf number
26 is located at the analog soundhead.
2. With the length threaded through the Cat. No. 700 Digital Soundhead, read the
number of the perforation present in the light path of the Digital Soundhead.
Enter this number using the procedure shown below:
FORMATS
Menu Cancel OK
Exit
From the System Alignment menu, press
the Digital Soundhead Delay key
(SK7).
OK
Using the front panel knob, dial in the
desired number of perfs obtained from
either of the methods described.
Press OK.
3. Verify the accuracy of the setting by running a loop of Cat. No. 1010 test film
and observing that the flash on the screen coincides with the pip in the sound.