Patent ID: 7487097

Claim:
An apparatus for generating a decorrelation signal using an input signal, comprising: an input signal including a block having a predetermined number of input samples, wherein the input signal is sampled before being filtered; a provider for providing a plurality of subband signals, wherein a subband signal includes a sequence of at least two subband samples, the sequence of the subband samples representing a bandwidth of the subband signal, which is smaller than a bandwidth of the input signal, wherein the provider is configured to provide a decimated subband signal such that the number of subband samples in a subband signal is smaller than the number of input samples; and a filter for filtering each subband signal using a reverberation filter to obtain a plurality of reverberated subband signals, wherein the step of decimating the subband signal occurs before a step of filtering, and wherein a plurality of reverberated subband signals together represent the decorrelation signal.