DTS 70 mm is a process specifically designed for playback in motion picture theaters that are equipped with 70 mm projection and 6-track stereo. However, the 70 mm DTS prints lack analog backup if the digital sound fails, since they do not have 6-track magnetic striping. The time code track on such a film is several times wider than the 35 mm version and theaters with 70 mm DTS install two time code readers for greater reliability.
Dolby Digital isn’t adapted to the 70 mm format and the gradual disappearance of 70 mm format has resulted in DTS-70 being used only for niche engagements. It is a dual system where the digital audio data is recorded on CD-ROM discs. The DTS system reads the special code printed on the 70 mm motion picture film and plays the correct sound for each frame of film projected.
The DTS system provides six channels that include left, right, center, mono surround and subwoofer. The system is automated and also tracks film breaks and change-overs. Analog or digital sound masters can be used for the purpose of transfer. The automation of the system eliminates the need of any action by the projectionist as it automatically starts and stops. Also, the system checks the time code on the movie disc and assures that the correct sound is played with the picture that is being projected.
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