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How will an MPEG-1 decoder get information from all channels when receiving an MPEG-2 Audio bitstream?

April 26, 2017audio bitstream channels decoder mpeg-1 MPEG-2

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How will an MPEG-1 decoder get information from all channels when receiving an MPEG-2 Audio bitstream?

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An MPEG-1 decoder will be supplied with an appropriate two-channel downmix of all the channels in the multichannel ensemble, contained in the MPEG-1 core of the MPEG-2 bitstream. The left and right channel of the downmix together contain components of all the channels, according to the equations in the compatibility matrix.