Fraunhoffer ISS, Thomson, and Agere Systems, has announced a new mp3 format that supports 5.1 channels of audio. Supposedly the files are not significantly larger than regular mp3.
http://www.mp3surround-format.com/
I wonder what the format the decoder outputs for these files. Is it 5 channel PCM, or is it Dolby Digital or DTS? Supposedly these streams can be output though a S/PDIF connection. Normally receivers can only handle DTS or Dolby Digital for multi channel streams
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