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.
