AC3 codec

http://www.google.dk/search?hl=da&q=ac3+codec&btnG=S%C3%B8g&meta=cr%3DcountryDK

http://www.merlin.dk/main.asp?doc=spoerg_detail&q=1&kat=surroundsound

http://www.artists.co.il/doom9/index.html?/doom9/glossary.htm

http://www.dolby.com/resources/tech_library/index.cfm

Dolby Digital (AC-3)
Surround sound technology that delivers high-quality digital audio for up to 5.1 discrete channels (Left/Center/Right/Left surround/Right surround/Low-Frequency Effects). The five speaker channels produce a directional and more realistic effect and the Low- Frequency Effects (LFE) channel (usually reproduced through a subwoofer) can often be felt as well as heard. Found in: DVDs; DVD players; broadcast programming in HDTV, digital cable, and (DBS, DTH) direct broadcast satellite (DirecTV/Dish/Sky TV); PCs; Microsoft Xbox game consoles; digital TVs; automotive DVD-Audio/Video players; automotive video, networking and home audio/video receivers; film soundtracks encoded in Dolby Digital. More