Four Channel Compact Disc Digital Audio
From Freepedia
Four Channel Compact Disc Digital Audio is a four-channel audio format specified under the Compact Disc Digital Audio Red Book standard.
Three versions of the official Red Book, June 1980, Sept. 1983, and Nov. 1991, give the same remark on page 1, "Main parameters", namely -Number of channels: 2 and/or 4 simultaneously* sampled. In the footnote: *In the case of more than two channels the encoder and decoder diagrams have to be adapted. It is not clear what the CD founding fathers meant with the term '2 and/or 4 simultaneously sampled'. The Red Book does not specify any 'adaption' of the encoder and decoder diagram or subcode channel assignment. The Red Book does not specify the playing time, or sampling rate, subcode, or other major specifications of the 4-channel CD.
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Commercial four channel CD releases
Even though the Red Book standard allows for four-channel CDs, there are very few mass-marketed releases in this format.
Hardware & software
All CD recorders can write discs with the necessary subcode channel data for four-channel audio. CD authoring software which can generate four-channel audio data is less common. One such application is cdrdao.
While four-channel audio is part of the Red Book standard, software developers are often discouraged from implementing this feature in CD burning software due to newer and higher fidelity media formats being available, such as Super Audio CD and DVD-Audio.
See also
External link
- Cdrdao (Open Source CD burning software)
