Waveform distortion removing apparatus

Details Waveform distortion removing apparatus Waveform distortion removing apparatus

1990-10-10

1993-06-01

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358405, 358167, 375 15, H04N 521

Patent

active

052165078

ABSTRACT:
A waveform distortion removing apparatus includes a digital filter having taps and being controlled in response to tap coefficients. An error signal sequence is generated from a video signal. The error signal sequence contains a waveform distortion. A quadrature signal is generated which has a quadrature relation with the error signal sequence. An absolute value of the quadrature signal is derived. The absolute value of the error signal sequence and the absolute value of the quadrature signal are compared with each other. A greater of the absolute values is selected. The tap coefficients are set in dependence upon the selected greater of the absolute values.

REFERENCES:
patent: 4575857 (1986-03-01), Murakami
patent: 4771438 (1988-09-01), Nash
patent: 4979036 (1990-12-01), Smith et al.
patent: 4989170 (1991-01-01), Batruni et al.
patent: 5025317 (1991-06-01), Koguchi et al.

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