![]() ![]() Ries, for a variable density soundtrack recording, which was submitted to the SMPE (now SMPTE), which used the mercury vapor lamp as a modulating device to create a variable-density soundtrack. Sound on film can be dated back to the early 1880s, when Charles E. Earlier technologies were sound-on-disc, meaning the film's soundtrack would be on a separate phonograph record. Sound-on-film processes can either record an analog sound track or digital sound track, and may record the signal either optically or magnetically. Sound-on-film is a class of sound film processes where the sound accompanying a picture is recorded on photographic film, usually, but not always, the same strip of film carrying the picture. Finally, to the far right, the timecode used to synchronize with a DTS soundtrack CD-ROM is visible. These are generally encoded using Dolby Stereo matrixing to simulate four tracks. The two tracks of the analog soundtrack on the next strip are bilateral variable-area, where amplitude is represented as a waveform. The outermost strip (left of picture) contains the SDDS track as an image of a digital signal the next contains the perforations used to drive the film through the projector, with the Dolby Digital track (grey areas) with the Dolby Double-D logo, between them. Edge of a 35mm film print showing the soundtracks. ![]()
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