Abstract
An audio encoder for producing stereo signals based on multi-channel signals, wherein a downmix part (100) downmixes multi-channel signals, which are of greater-than-two channels, to two-channel stereo signals. A first encoding part (101) encodes a downmixed stereo signal to produce a first encoded signal. A second encoding part (102) encodes information, which is to be used for restoring a multi-channel signal from the downmixed stereo signal, to produce a second encoded signal. An encoding amount calculating part (103) calculates the encoding amount of the second encoded signal. A first multiplexing part (104) multiplexes either the first or second encoded signal with the calculated encoding amount. Therefore, a decoder can easily extract, based on the encoding amount, the encoded version of the multi-channel signal. As a result, such a decoder that reproduces only the downmixed signals can be made at a low cost.
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