| 摘要 |
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 the 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.
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