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.

Ambisonics is a series of recording and replay techniques using multichannel mixing technology that can be used live or in the studio.

Dolby Digital is the marketing name for a series of data/audio compression technologies developed by Dolby Laboratories.

MP3 Surround is a type of MP3 that supports 5.1 channels of audio.

Surround sound encompases a range of techniques for enriching the sound reproduction quality of an audio source with audio channels reproduced via additional, discrete speakers.

This superb surround sound format was first introduced in 1996 by THX creator Tom Holman. It incorporates 14 speakers (2 of them are subs!).

22.2 multichannel sound is a part of Ultra High Definition System (or “Super Hi-vision”), developed by Japan Broadcasting Company (NHK). It was named after Kimio Hamasaki – a Senior Research Engineer at NHK Science & Technical Research Laboratories. It utilizes 24 speakers (including two sub-woofers) arranged in three layers, which create a 3D space around a listener.