Sony Dynamic Digital Sound

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A photo of a print featuring all four audio formats (or "quad track")- from left to right, SDDS (blue area to the left of the holes), Dolby Digital (grey area between the sprocket holes), analog sound (the two white lines to the right of the Dolby Digital track), and the DTS timecode (the dashed line to the right of the analog track.)
SDDS stands for Sony Dynamic Digital Sound, which is a cinema sound system developed by Sony. Digital sound information is recorded on both outer edges of the 35 mm film release print. The system supports up to 8 independent channels of sound: 5 front channels, 2 surround channels and a sub-bass channel. Only Cinerama and Cinemiracle have used as many sound tracks. This arrangement is similar to 70 mm magnetic sound formats and is useful mainly for very large cinema screens. Most cinemas are capable of four to six-track stereophonic sound, and it may sometimes be downmixed.
Although SDDS is technically supported by the DVD spec, no current home theatre systems support it and therefore no known DVD titles have been released with an SDDS track.
Contents
1 History
2 Technical
3 Reader
4 Decoder
5 References
6 External links
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History
SDDS was developed for Sony under contract with Semetex Corp., located in Torrance, California. Although originally slated to premier with Hook, the SDDS project was delayed and instead premiered on June 17, 1993 with the Arnold Schwarzenegger film Last Action Hero. Since then, over 1,400 movies have been mixed in Sony Dynamic Digital Sound, and as of early 1999 over 6,750 movie theaters have been equipped to with SDDS.
The Code name for the SDDS project was "Green Lantern", taken from a comic book hero and the old term of "magic lantern" used to describe the original projected pictures in the late 19th century. Green came to mind because the key to imprinting the 8 micrometre data bits was to use a green laser.
The SDDS Chief Architect was Jaye Waas and the Chief Optical Engineer was Mark Waring, both employed by Semetex.
The SDDS development took just 11 months from concept to working sound camera, but at the cost of working 16 hours a day, 7 days a week.

SDDS 8-Channels, this logo is used when all 8 channels are used as opposed to the usual six.
Out of the 1,400 plus films mixed in SDDS, only 97 of them to date have been mixed to support the full 8 channels, mostly because most mixing studios are geared towards producing 5.1 mixes rather than 7.1 mixes. Since the additional sound equipment required for 8 channel SDDS makes it more expensive to install, it tends to be installed only in larger venues.
SDDS was consistently the least popular of the three formats, and Sony Cinema Products finally, closed shop in 2002. SDDS is still supported by most of the major studios, but is not frequently installed in new cinemas anymore. However it is still a very active format with usage in over 150 new features in 2005 and well over 100 announced for 2006. Of these, only 5 were in 8-channels for 2005, and 4 for 2006.
The bulk of major cinema release prints produced in Western countries now simultaneously carry SDDS, DTS, and Dolby Digital data (or "tracks") as well as the traditional two-channel optical sound track. The optical track is required on every print, both because not all cinemas are yet equipped for digital sound, and as a backup in case the digital information fails.
Due to their placement on the very edges of the film stock, SDDS tracks are more prone to damage than the other digital formats. As with other digital sound formats, any failure of the digital track will result in a "drop-out" to either another digital format (Dolby Digital or DTS) if available, or (most likely) to analog sound. These drop-outs are audible to most audiences as a change in volume level and a slight loss of fidelity and low-end, although it is more difficult to tell in a properly calibrated auditorium.
SDDS lags behind both Dolby Digital and DTS in deployment due to its late arrival, combined with its reliability issues and lack of new equipment. Dolby Digital is included on nearly all releases, and is often the only track on independent or low-budget films. The DTS track is usually included on major releases, although playback requires matching CD-ROMs which are not always supplied.
See also List of 8 channel SDDS films.
As of 2002, Sony has stopped supporting the SDDS system. A majority of release prints still are created with all three digital tracks -- Dolby Digital, DTS and Sony's SDDS (each digital track uses different film geography so all three as well as the analog track can coexist on one print) -- but most professionals in the industry now consider SDDS a dying system.
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