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Dolby SR-D

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Dolby SR-D, also called Dolby Digital is an optical digital format introduced in 1992. "SR-D" refers to the fact that all prints with Dolby Digital tracks are also equipped with analog SR tracks.

SRD was originally six channels with left, center, right, subwoofer, left surround and right surround. Since 1999 it is now seven channels with the addition of an independent back surround.

Dolby SRD is easily distinguishable from Mono, Dolby SR, and Dolby A since the digital information looks like a cloud of dots between the sprockets. Because the sound data resides on a part of the film that touches the gears and rollers during the projection, the quality of the digital signal can quickly deteriorate. For this reason during playback, you should check the error rate of the digital signal on the Dolby sound processor. If it is constantly failing because the signal quality is too poor, the processor will revert to Dolby SR. The change in sound quality from SRD to SR is very apparent, so if the film is constantly switching between SRD and SR it is preferable to switch the sound format to SR and leave it in that format.

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