Video control circuit

Details Video control circuit Video control circuit

1990-06-26

1991-11-26

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358243, H04N 557, H04N 559

Patent

active

050687301

ABSTRACT:
A control circuit comprises a first detector for detecting amplitude excursions of a signal related to luminance information beyond a white level threshold during each horizontal scan. This enables the circuit to be more sensitive by responding to excursions occurring during each horizontal scanning line. A first timer, responsive to the first detector, provides a first control signal related to a minimum duration of each amplitude excursion of the signal bey ond the threshold. A switch and second timer, responsive to the first control signal, provide a second control signal which falls at a first rate to reduce the signal; and, which rises at a second rate to permit the signal to increase after termination of the amplitude excursion, until the next minimum duration excursion. The time constant for the second rate is much greater than the time constant of the first rate.

REFERENCES:
patent: 4126884 (1978-11-01), Shanley, II
patent: 4167025 (1979-09-01), Willis
patent: 4549218 (1985-10-01), Norley et al.
patent: 4599643 (1986-07-01), Harlan
patent: 4689668 (1987-08-01), Sutherland, II et al.
patent: 4760450 (1988-07-01), Yagi

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