Cinema Digital Sound
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Cinema Digital Sound (CDS) is a multi-channel surround sound format used for theatrical films in the early 1990's. The system was developed by Eastman Kodak and Optical Radiation Corporation. CDS was quickly superseded by Digital Theatre System (DTS) and Dolby Digital formats.
CDS encoded 5.1 channels of discrete audio on 70mm and 35mm film prints. CDS encoded 16-bit PCM audio in a delta modulation compression. The compression level of CDS is 4:1. The system was set up in the typical Left, Center, Right, Right Surround, Left Surround, LFE channel format. The CDS tracks replaced the analog audio tracks on 35mm and 70mm prints. Not all films distributed with CDS soundtracks used all 5.1 channels. Some, such as Edward Scissorhands were mixed using only the 4 channels supported by Dolby Stereo, the principal format in use at the time. Universal Soldier was the last film encoded with CDS.
