| 摘要 |
<p>An apparatus for subband processing of an audio signal is presented that comprises an analysis filter bank, signal processors and a synthesis filter bank. The analysis filter bank includes two signal branches for establishing two subbands and for decomposing the audio signal into two subband signals, the first branch of which includes a decimation filter, a subsequent down-sampling unit and a subsequent basis filter, and the second branch includes an allpass filter and a subtractor that is connected downstream of the allpass filter and that is connected downstream of the basis filter via an up-sampling unit and a subsequent interpolation filter. At least one of the decimation filter and the interpolation filter is an infinite impulse response (IIR) filter, and the allpass filter has a phase response adapted to compensate for the phase response of at least one of the decimation filter and the interpolation filter.</p> |
