Low distortion filters for separating frequency or phase...

Details Low distortion filters for separating frequency or phase... Low distortion filters for separating frequency or phase...

H - Electricity

03

H

350/97

H03H 17/02 (2006.01) H03H 15/00 (2006.01) H04B 1/16 (2006.01)

Patent

CA 1282167

Abstract A circuit for separating FM signals from a composite signal utilizes a comb filter having successive frequency response nulls which span the frequency spectrum of the FM signal to be separated. The comb filter response is phase linear and defines the pass-band of the desired signal. A nonideal or phase nonlinear bandpass filter can be cascaded with the comb filter to attenuate out of band signals. The cascade combination of the comb filter and nonlinear bandpass filters is a cost effective substitute for the conventional, complicated phase linear bandpass filter having a boxcar frequency response traditionally used to separate FM signals.

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