| 摘要 |
<p>An audio system with at least one audio channel is disclosed. The audio system includes a digital audio processor in which at least one digital filter is implemented for each channel. The digital filter of each channel comprises: an analysis filter bank (22) configured to receive a broad-band input audio signal and divide the input audio signal into a plurality of sub-bands thus providing sub-band signals having equal bandwidths, the spectra of the sub-band signals composing the spectrum of the input audio signal; a sub-band FIR filter (G 1 ,G 2 ,G 3 ...) for each sub-band, thus providing respective filtered sub-band signals; and a synthesis filter bank (22') configured to receive the filtered sub-band signals and to combine them for providing a broad-band output audio signal, wherein a delay (” 1 ,” 2 ,” 3 ,...) is associated with each sub-band signal, the delay (” 1 ) of one of the sub-band signals being applied to the broad-band input audio signal upstream of the analysis filter bank and the residual delays (” 2 -” 1 ,” 3 -” 1 ) being applied to the remaining sub-band signals downstream of the analysis filter bank.</p> |
