EFFICIENT FILTERING WITH COMPLEX MODULATED FILTERBANK Russian patent published in 2010 - IPC H03H17/02 

FIELD: physics.

SUBSTANCE: 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, comprises 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 said 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 synthesising output data of the intermediate filters to obtain the time domain output signal.

EFFECT: more efficient or deeper manipulation of with a time domain input signal of higher quality.

39 cl, 15 dwg