Dolby
®
Model CP650 Installation Manual
Introduction
1-9
1.8
How to Identify Types of Soundtracks
Edge of film Dolby Digital soundtrack Analog soundtrack Picture area
Figure 1–2
Photograph of Film Soundtracks
A Dolby Digital, Dolby Digital Surround EX, stereo optical (Dolby A-type or SR), or
mono optical print should be identified as such on both the film can and the leader.
However, with handling, the identification may be lost. If neither is available, close
inspection of the film itself will help distinguish the various types. Digital data blocks
are printed between the perforations on the side of the film next to the analog
(Dolby SR) track.
a
aa
a
aaa
a a
a
a
a
Dolby Digital or Dolby Digital
Surround EX Print
Analog Dolby SR or A-type Print
Analog Mono Print
The digital data is clearly visible
between perforations next to the
analog track. The analog track is
Dolby SR encoded.
Clear differences between the stereo
channels will be seen in some places
along the track.
Both tracks are the same.
Figure 1–3
Film Soundtrack Identification
