| 摘要 |
A method and decoder are provided for parametrically decoding a stereo digital audio signal. The method includes synthesizing the stereo signal, per frequency sub-band, on the basis of a decoded mono signal ({circumflex over (M)}[j]), arising from a downmix of the stereo signal and from spatial information parameters of the stereo signal, in such a way that the signals obtained have the following form: L ^ [ j ] = c 1 [ j ] · M ^ 1 [ j ] R ^ [ j ] = c 2 [ j ] · M ^ 2 [ j ] , with {circumflex over (L)}[j] and {circumflex over (R)}[j] being channels of the synthesized signal, {circumflex over (M)}1[j] and {circumflex over (M)}2[j] being signals that are a function of the decoded mono signal and c1[j], c2[j] being gains, wherein the gains are calculated as follows: c 1 [ j ] = 2 I ^ [ j ] I ^ [ j ] + 1 c 2 [ j ] = 2 I ^ [ j ] + 1 with Î[j] being an amplitude ratio between the two channels of the stereo signal, obtained from the decoded parameters.
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