| 摘要 |
A circuit for peaking video signals, which can be developed by combining a video signal with a peaking signal having a preshooting and a overshooting potion that are respectively controlled in peaking levels thereof. The circuit includes a delay circuit for delaying a luminance signal for a first predetermined time in order to generate a first delayed signal and for delaying the first delayed signal for a second predetermined time in order to generate a second delayed signal. An adder adds the second delayed signal to a current video signal in order to generate an added signal. A variable amplifying section amplifies the added signal in response to a first control signal from an exterior in order to generate a first variable amplified signal, and amplifies the added signal in response to a second control signal from the exterior in order to generate a second variable amplified signal. A selecting section compares the added signal from the adder with a reference signal, and selects the first amplified signal or the second amplified signal according to the comparison result. A subtracter subtracts the first amplified signal or the second amplified signal from the select section from the first delayed signal from the delay section in order to generate a subtracted signal as a peaked video signal. Therefore, the circuit can control the preshooting portion and the overshooting portion of the peaking signal used to peak video signals.
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