DC restoration circuit

Details DC restoration circuit DC restoration circuit

1985-12-11

1987-09-01

Masinick, Michael A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 34, 358168, H04N 518

Patent

active

046912355

ABSTRACT:
A DC restoration circuit includes a gate circuit, potential clamp capacitor, potential source circuit, detector circuit and mixing circuit. The gate circuit is responsive to both a first signal having a specific potential portion (pedestal level) and also to a gate signal generated at a given timing. The gate circuit detects the specific potential portion when the gate signal is generated, and provides a second signal corresponding to the detected specific potential portion. The potential clamp capacitor is used for clamping the potential of the second signal so as to provide a clamped potential. The potential source circuit is used for generating a level adjusting potential. The detector circuit is used for detecting the potential difference between the clamped potential and the level adjusting potential, and for providing a third signal corresponding to the potential difference. The mixing circuit is responsive to an input signal corresponding to the first signal, and is used for mixing the third signal with the input signal. The mixing circuit provides an output signal which contains a signal component of the specific potential portion. The DC level of this signal component depends on the level adjusting potential.

REFERENCES:
patent: 3985954 (1976-10-01), Kuniyoshi et al.
patent: 4114179 (1978-09-01), Ilieve
patent: 4143398 (1979-03-01), Harwood et al.
patent: 4183050 (1980-01-01), Tsuchiya et al.
patent: 4197557 (1980-04-01), Tuma et al.
patent: 4204221 (1980-05-01), Shanley, II
patent: 4293874 (1981-10-01), Reneau
Product AN 5315 (Matsushita Electric Industry KK) '84 National Electronic Components No. 6, p. 507, Matsushita Electronic Industry IC AN 5315.

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