Sharpness up/down circuit for VCR controlled by a remote control

Details Sharpness up/down circuit for VCR controlled by a remote control Sharpness up/down circuit for VCR controlled by a remote control

1990-06-26

1991-12-10

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

3581941, 358188, 358168, H04N 557

Patent

active

050722999

ABSTRACT:
A VCR sharpness up/down circuit controlled by a remote controller for allowing a remote control of VCR sharpness properly by pressing a sharpness-up key or a sharpness-down key on the remote controller with the construction of a sharpness driving unit and a screen control unit and control method thereof by receiving sharpness up/down key signals from the remote controller, counting the number of input up/down key signals, selecting and outputting PWM signals from a PWM data storage unit according to the counted number, converting the output PWM signals through switching operations to a sharpness driving control voltage which is a certain DC voltage, and applying a driving control voltage to an integrator which emphasizes a video signal.

REFERENCES:
patent: 4626848 (1986-12-01), Ehlers
patent: 4626892 (1986-12-01), Nortrup
patent: 4907082 (1990-03-01), Richards

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