Patent ID: 8315859
Filing Date: 2012-11-20
Classification: G10L,H03H

Abstract:
1. Filter apparatus for filtering a time domain input signal to obtain a time domain output signal, which is a representation of the time domain input signal filtered using a filter characteristic having an non-uniform amplitude/frequency characteristic, comprising: a complex analysis filter bank for generating a plurality of complex subband signals from the time domain input signals; a plurality of intermediate filters, wherein at least one of the intermediate filters of the plurality of the intermediate filters has a non-uniform amplitude/frequency characteristic, wherein the plurality of intermediate filters have a shorter impulse response compared to an impulse response of a filter having the filter characteristic, and wherein the non-uniform amplitude/frequency characteristics of the plurality of intermediate filters together represent the non-uniform filter characteristic; and a complex synthesis filter bank for synthesizing the output of the intermediate filters to obtain the time domain output signal, wherein at least one of the complex analysis filter bank, an intermediate filter of the plurality of intermediate filters, and the complex synthesis filter bank comprises a hardware implementation.