Patent ID: 6236731
Filing Date: 2001-05-22
Classification: H03H,H04R

Abstract:
An oversampled filterbank for filtering an information signal, the filterbank having a filterbank structure comprising a filter means defining a filter bandwidth, said filter means filtering said information signal and separating said information signal into a plurality of frequency band signals, each representing one of a plurality of uniformly spaced frequency bands within said filter bandwidth, said frequency bands being stacked in one of an even and an odd manner and said frequency bands overlapping, such that the summation of the unmodified frequency band responses of the plurality of said frequency bands sums to a function within a predetermined passband ripple over said filter bandwidth, wherein the filter means includes a selection input enabling at least one of the following to be selected:(i) the number of frequency band signals,(ii) the bandwidth of said frequency bands,(iii) selection of stacking of said frequency bands in one of an even and an odd manner,(iv) the degree of overlap between said frequency bands;(v) an oversampling factor by which said frequency band signals are sampled above the theoretical minimum of critical sampling.