Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1989-04-18
1992-07-28
Chin, Tommy P.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358169, 358 74, 358243, H04N 519, H04N 559
Patent
active
051344904
ABSTRACT:
A brightness limiter is responsive to a beam current control signal in a predetermined range of beam current operating values with an extended operating threshold for reducing brightness and reducing beam current. Operation of the brightness limiter responsive to certain noise in the beam current control signal during retrace is inhibited, the brightness limiter being otherwise responsive to the beam current control signal at operating values below the threshold. Operation of the brightness limiter may be inhibited by passing the beam current control signal through an AC filter. Alternatively, operation of the brightness limiter may be inhibited during retrace by interrupting propagation of the beam current control signal, or by preventing operation of the brightness limiter, for example, responsive to flyback pulses or pulses in timed relationship to flyback pulses.
REFERENCES:
patent: 3674932 (1972-07-01), Griepentrog
patent: 3804981 (1974-04-01), Avins
patent: 3873767 (1975-03-01), Okada et al.
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patent: 4356508 (1982-10-01), Okada
patent: 4947253 (1990-08-01), Neal
patent: 4982287 (1991-01-01), Lagoni
Chin Tommy P.
Fried Harvey D.
Laks Joseph J.
Thomson Consumer Electronics Inc.
Tripoli Joseph S.
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