Apparatus for removing waveform distortion from a video signal

Details Apparatus for removing waveform distortion from a video signal Apparatus for removing waveform distortion from a video signal

1992-04-30

1993-08-17

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358905, H04N 521

Patent

active

052374165

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: 4344089 (1982-08-01), Utsunomiya et al.
patent: 4389623 (1983-06-01), Onishi et al.
patent: 4413282 (1983-11-01), Wargo
patent: 4477913 (1984-10-01), Koya et al.
patent: 4564952 (1986-01-01), Karabinis et al.
patent: 5144414 (1992-09-01), Nishi et al.

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