Editing Sony Dynamic Digital Sound (section)

==Technical==
[[Image:7 1 channels (extended surround sound SDDS) label.svg|thumb|SDDS channel arrangement with 5 front channels, 2 surround channels and a subwoofer channel or "5/2.1".]]

*Original format used: 8 micron (micrometre) square data bits, 16 bit per audio channel, 8 audio channels, 2 clock tracks, 2 guide tracks for alignment with the film.
*Final format used: 24 micrometre square data bits.

The format carries up to 8 channels of Dynamic Digital Sound (DDS) encoded using Sony's [[Adaptive Transform Acoustic Coding|ATRAC]] codec with a compression ratio of about 5:1 and a sampling rate of 44.1&nbsp;kHz. The channels are:
*5 screen channels
**Left
**Left center
**Center
**Right center
**Right
*2 surround channels
**Left surround
**Right surround
*Subwoofer channel

Additionally there are 4 backup channels encoded – in case of damage to one side of the film or the other. These are:
*Center
*Subwoofer
*Left + left center
*Right + right center

This gives a total of 12 channels, for which the total bitrate of 2.2 megabits per second. This is more than the maximum 1.536 megabits per second [[DTS, Inc.|DTS]] format bitrate, and far greater than the cinema [[Dolby Digital]] bitrate of 320 kilobits (0.32 megabits) per second.

For additional data reliability the two sides of the film are separated by 17 frames and half, so a single splice or series of missing frames will not result in a total loss of data.<ref>{{cite book |last1=Saito |first1=E. |last2=Osato |first2=K. |last3=Nakao |first3=T. |chapter=Sony dynamic digital sound |title=Technical Digest. CLEO/Pacific Rim'95. The Pacific Rim Conference on Lasers and Electro-Optics |date=1995 |page=107 |doi=10.1109/CLEOPR.1995.521364 |isbn=0-7803-2400-5 |chapter-url=https://ieeexplore.ieee.org/document/521364 |access-date=12 October 2024}}</ref>