Operating instructions

A-1

APPENDIX A

HOW TO TELL A STEREO OPTICAL PRINT FROM A MONO

A Dolby encoded optical print should be identified as such on both the film can

and leader. However, with handling the identification may be lost. If you are

not sure if you have a stereo print, play a reel and find a section with music and/

or effects only (on dialogue or narration, stereo soundtracks look much the

same as mono soundtracks). Examine the soundtracks closely; on music and

effects, the two soundtracks will appear to be different on a stereo print; on a

mono print they are identical. Alternatively, while the film is playing, open the

front panel and check the signal-present LEDs; the left, center, and right LEDs

will flicker regularly if the print is stereo; the center LED will predominate if the

print is mono. If you specified a stereo print and received a mono print in error,

be sure to check with your local exchange or the film distributor.

Mono Print

Both tracks are the

same.

Analog Stereo Print

Clear differences between

channels will be seen in

some places along the track.

DolbyDigital Print

The digital data is

clearly visible

between perforations

next to the analog

track. The analog

track is Dolby SR.

Mono, Stereo, and Digital Soundtracks

There is no way to tell by visual inspection if a stereo print has been encoded

with a surround channel. However, all but a few early Dolby Stereo releases

do have a surround channel so, in general play any stereo print in format 04

Dolby A-type.