| 摘要 |
A portable player ( 710 ) or a multi-channel home player ( 730 ) includes: a mixed signal decoding unit ( 711 ) that extracts, from a first inputted coded stream, a second coded stream representing a downmix signal into which multi-channel audio signals are mixed and supplementary information for reverting the downmix signal back to the multi-channel audio signals before being downmixed, and that decodes the second coded stream representing the downmix signal; a signal separation processing unit ( 731 ) that separates the downmix signal obtained by decoding based on the extracted supplementary information and that generates audio signals which are acoustically approximate to the multi-channel audio signals before being downmixed; and headphones or speakers ( 720 ) that reproduce the decoded downmix signal or speakers ( 740 ) that reproduce the multi-channel audio signals separated from the downmix singal.
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