MPEG Multichannel


MPEG Multichannel is an extension to the MPEG-1 Layer II audio compression specification, as defined in the MPEG-2 Audio standard which allows it provide up to 5.1-channels of audio. To maintain backwards compatibility with the older 2-channel audio specification, it uses a channel matrixing scheme, where the additional channels are mixed into the two backwards compatible channels. Extra information in the data stream contains signals to process extra channels from the matrix.
It was originally a mandatory part of the DVD specification for European DVDs, but was dropped in late 1997, and is rarely used as a result.
The Super Video CD standard supports MPEG Multichannel. Player support for this audio format is nearly non-existent however, and it is rarely used.
MPEG Multichannel audio was proposed for use in the ATSC digital TV broadcasting standard, but Dolby Digital was chosen instead. This is a matter of significant controversy, as it has been revealed that the organizations behind 2 of the 4 voting board members received tens of millions of dollars of compensation from secret deals with Dolby Laboratories in exchange for their votes.
MPEG Multichannel–compatible equipment would bear either the MPEG Multichannel or MPEG Empowered logos.