| 摘要 |
Signals of different channels (C<SUB>1</SUB>-C<SUB>N</SUB>) are combined into one mono signal (x). A set of adaptive filters, preferably one for each channel (C<SUB>1</SUB>-C<SUB>N</SUB>), is derived in a respective filter adaptation unit (30:1-30:N). When an adaptive filter is applied to the mono signal (x) it reconstructs the signal of the respective channel (C<SUB>1</SUB>-C<SUB>N</SUB>) under a perceptual constraint. The perceptual constraint is a gain and/or shape constraint. The gain constraint allows the preservation of the relative energy between the channels (C<SUB>1</SUB>-C<SUB>N</SUB>) while the shape constraint allows more stability by avoiding unnecessary filtering of spectral nulls. The transmitted parameters are the mono signal (x), in encoded form, and the parameters (p<SUB>1</SUB>-p<SUB>N</SUB>) of the adaptive filters, preferably also encoded. The receiver reconstructs the signal of the different channels by applying the adaptive filters and possibly some additional post-processing.
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