Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1984-10-04
1987-06-16
Chin, Tommy P.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358166, 358905, 455295, H04N 521
Patent
active
046739823
ABSTRACT:
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 transfer 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.
REFERENCES:
patent: 4458269 (1984-07-01), Schroeder
patent: 4502077 (1985-02-01), Morotomi
Adaptive Noise Cancelling: Principles and Applications, by B. Widrow, Proceedings of the IEEE, vol. 63, No. 12, Dec. 1975, pp. 1692-1716.
Garceau Roger
Leblanc Andre
Tam Le Dinh C.
Centre de Recherche Industrielle Du Quebec
Chin Tommy P.
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