Selective efficiency videofrequency non-linearity correction dev

Details Selective efficiency videofrequency non-linearity correction dev Selective efficiency videofrequency non-linearity correction dev

1982-04-05

1985-02-26

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 35, H04N 538

Patent

active

045020760

ABSTRACT:
A selective efficiency (threshold) video frequency nonlinearity precorrection device comprising a direct channel (wide band channel) and an auxiliary processing channel (selected frequency correction channel), are both coupled to an input receiving the video frequency signal. The auxiliary channel may comprise a low pass filter, an inverting amplifier, a nonlinearity corrector circuit selecting a range of the signal limited by thresholds added with suitable phase and amplitude to the signal transmitted by the direct channel so that the resulting signal has, with respect to the input video frequency signal, compression or expansion limited to the range thus selected and only for the low frequency components of this signal.

REFERENCES:
patent: 3975586 (1976-08-01), Chow
patent: 4305090 (1981-12-01), Hess
patent: 4388638 (1983-06-01), Dischert

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