Device for correcting a videofrequency television signal by dyna

Details Device for correcting a videofrequency television signal by dyna Device for correcting a videofrequency television signal by dyna

1982-05-25

1985-03-12

Masinick, Michael A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358166, H04N 521

Patent

active

045048630

ABSTRACT:
A correcting device for dynamically reducing the noise pollution level with respect to a videofrequency signal mainly comprises an analog multiplier in which two previously generated signal components are multiplied by each other. One signal designated as the filtered signal is the result of a passage of the initial signal through a low-pass filter. The other signal or so-called contour signal is the difference between the initial signal and the filtered signal. The contour signal noise is cancelled at the time of the zero-crossings of the filtered signal and variably attenuated according to the level of the filtered signal in the case of the other levels of the signal. Addition of the filtered signal and of the contour signal processed and suitably adjusted for amplitude reconstitutes a corrected videofrequency signal.

REFERENCES:
patent: 4009334 (1979-02-01), Sypula
patent: 4031547 (1977-06-01), Saiki

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