H - Electricity – 03 – H
Patent
H - Electricity
03
H
333/47
H03H 21/00 (2006.01) H04N 5/21 (2006.01)
Patent
CA 1226630
Abstract of the Disclosure A multiple frequency adaptive filter system for filtering undesired periodic and/or correlated interference signals contained in the same frequency band as a desired input signal. The filter system is capable of filtering at least two sinusoidal interference signals and incorporates a negative feedback loop having a trans- for function of that of narrow band-pass multiple filter. The feedback loop using interference frequencies generates a corresponding interference enhanced output signal. This enhanced output signal is combined with the input signal whereby to produce an error signal which corresponds to the desired signal contained in the input frequency band. A double or quadruple filter system is also described as examples of the present invention. The filter system is suitable for removing modulated sinusoidal interference and particularly for reducing TV co-channel interference.
468943
Garceau Roger
Leblanc Andre
Tam Le D.c.
Centre de Recherche Industrielle Du Quebec
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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