4-3
DYNAMIC
1.
Thread a loop of Cat. No. 1010 through the projector, analog soundhead, and
Digital Soundhead. Run the projector.
2.
Locate SW5, the top rotary switch on the Cat. No. 611A Cinema Processor Interface
Card located between the analog signal presence LED and the Dolby Digital LED
of the C.P. Status slot in the front panel of the DA20. Set SW5 to the position 9,A,
or B depending on the Cinema Processor type (see section 4.1)
3.
Monitor audio from the center channel of the DA20 while simultaneously
monitoring audio from the analog tracks through the Cinema Processor. This may
be accomplished by setting the cinema processor to format 05 (SR) and monitoring
the analog audio normally, while listening to digital audio from the DA20 on a
separate monitor circuit. Headphones may be connected to J8 pin 20 (center
channel) and J8 pin 1 (signal ground) by means of an adapter to monitor the digital
audio (consult Dolby Laboratories for additional information).
Stereo Headphones used to adjust sync.
DA10
CP
4.
Adjust SW1, 2 and 3 for minimum delay between the analog track and the digital
track.
5.
Return SW5 to the correct Cinema Processor position (see section 4.1)
4.3
Digital Surround Delay Adjustment
Surround delay is adjusted by threading a loop of Cat. No. 1010 Digital Sync. alignment
test film as above, and monitoring all channels the audio. The bottom rotary switch on
the Cat. No. 611 C.P. Interface Card in slot 19 has 16 positions, (0-F) where each position
adds 10ms of delay to the surround channels. The following tables show approximate
delay values (in milliseconds) based on theater width and length, but because theater
geometry affects the amount of surround delay required, setting of surround delay
should be verified by listening at various locations in the theater. Note: This is not the
same delay as used on the Cat. No. 150.
