DocumentCode :
2831619
Title :
Externally controlled time-varying constrained notch filter
Author :
Wulich, Dov ; Plotkin, Eugene I. ; Swamy, M.N.S. ; Tong, Wen
Author_Institution :
Dept. of Electr. & Comput. Eng., Concordia Univ., Montreal, Que., Canada
fYear :
1991
fDate :
11-14 Jun 1991
Firstpage :
1440
Abstract :
An application of a constrained notch filter (CNF) for filtering a sine signal with arbitrary varying frequency is considered. It is shown that the concept of CNF can be easily extended to time-varying CNF (TVCNF) whose coefficients vary with time according to the rule of frequency variation of the considered FM signal. Such a TVCNF is able to reject the FM signal and at the same time remain transparent to any other signal. The main problem in TVCNF implementation is to provide a proper control (synchronization) of its coefficients. An application of the TVCNF for the enhancement of an arbitrary signal corrupted by a strong FM interference is investigated. It is shown that if the synchronization is based on the input mixture, then for any negative signal-to-interference ratio (SIR≪0 dB) at the input of the TVCNF, the SIR at its output reaches 0 dB
Keywords :
active filters; frequency modulation; notch filters; FM interference; FM signal; arbitrary varying frequency; frequency variation; input mixture; signal-to-interference ratio; sine signal; synchronization; time-varying constrained notch filter; Adaptive filters; Application software; Background noise; Communication system control; Filtering; Frequency modulation; Frequency synchronization; Interference; Signal design; Signal processing;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Circuits and Systems, 1991., IEEE International Sympoisum on
Print_ISBN :
0-7803-0050-5
Type :
conf
DOI :
10.1109/ISCAS.1991.176644
Filename :
176644
Link To Document :
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