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What does the compatibility in MPEG-2 multichannel mean?

April 26, 2017compatibility mean MPEG-2 multichannel

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What does the compatibility in MPEG-2 multichannel mean?

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The core of the MPEG-2 bitstream is an MPEG-1 bitstream. This enables fully compatible decoding with an MPEG-1 decoder. In addition, the need to transfer two separate bitstreams, called simulcast (one for two-channel stereo and another one for the multichannel audio programme) is avoided, at some cost in coding efficiency for the multichannel audio signal, compared to AAC which is a Non Backward Compatible (NBC) coding algorithm.