![]() All film prints with Dolby Digital data also have Dolby Stereo analogue soundtracks using Dolby SR noise reduction and such prints are known as Dolby SR-D prints. This data is finally decoded into a 5.1 channel audio source. A CCD scanner in the projector picks up a scanned video image of this area, and a processor correlates the image area and extracts the digital data as an AC-3 bitstream. A constant bit rate of 320kbit/s is used. Dolby Digital cinema soundtracks are optically recorded on a 35 mm release print using sequential data blocks placed between every perforation hole on the sound track side of the film. ![]() 5 Dolby technologies in packaged media formatsīatman Returns was the first film to use Dolby Digital technology when it premiered in theaters in Summer 1992.
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