Zvočni sistemi

DTS

Digital Theater Sound, developed by NuOptix, Inc. On the 35mm filmprint, an optical time code is placed in between the optical soundtrackand the picture frame. This optical time code is read, and used to synchronizethe film with the digital audio, which is played back from a compact disc.3:1 compression of the digital sound using DTS's Coherent Acoustic Codingalgorithm enables 6 audio channels to fit on a two-channel CD. Six audiochannels are output (Left, Right, Center, Left Surround, Right Surround,and Bass). If the digital sound path fails, the system switches to theanalog soundtrack as a backup. Debut film was Jurassic Park, 1993.

SDDS

Sony Dynamic Digital Sound, developed by Sony, Inc.. The digital soundinformation is encoded directly on the film print, placed on both edgesof the film, outside the sprocket holes. 8 channels of audio can be recordedwith 5:1 compression of the digital sound, using Sony's encoding algorithmcalled ATRAC. Eight channels are output (Left, Left Center, Center, RightCenter, Right, Left Surround, Right Surround, and Bass). If the digitalsound path fails, the system switches to the analog soundtrack as a backup. Debut film was Last Action Hero, 1993.

Dolby Digital

Also referred to as SR·D, developed by Dolby Laboratories, Inc.The digital sound information is encoded directly on the film print, placedin between the sprocket holes on the same side as the optical soundtrack.To fit 6 audio channels in this space, 10:1 compression of the digitalsound is used, using Dolby Labs encoding algorithm called AC-3. Six channelsare output (Left, Right, Center, Left Surround, Right Surround, and Bass).If the digital sound path fails, the system switches to the analog soundtrackas a backup. Debut film was Batman Returns, 1992.