Apparatus and method for downsampling an audio signal

An apparatus for processing an input audio signal (2300) is based on a cascade of filter banks, the cascade comprising a synthesis filter bank (2304) for synthesizing an intermediate audio signal (2306) from the signal input audio signal (2300), the input audio signal being represented by a plurality of first subband signals (2303) generated by an analysis filter bank (2302), wherein a filter bank number of the synthesis filter bank (2304) is less than a channel number of the analysis filter bank (2302). The apparatus further comprises an additional analysis filterbank (2307) for generating a plurality of second subband signals (2308) from the intermediate audio signal (2306), wherein the additional analysis filterbank has a number of channels that is different from the number of channels of the synthesis filter bank (2304),</p> <p>(Automatic translation with Google Translate, without legal value)