Video signal peaking circuit
DC CAFCFirst Claim
1. A circuit for peaking video signals, said circuit comprising:
- a delay section 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 for adding the second delayed signal to a current video signal in order to generate an added signal;
a variable amplifying section for amplifying the added signal in response to a first control signal from an exterior in order to generate a first variable amplified signal, and amplifying 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 for comparing the added signal from said adder with a reference signal, and for selecting the first amplified signal or the second amplified signal according to the comparison result; and
a subtracter for subtracting the first amplified signal or the second amplified signal from said select section from the first delayed signal from said delay section in order to generate a subtracted signal as a peaked video signal.
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Abstract
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.
15 Citations
10 Claims
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1. A circuit for peaking video signals, said circuit comprising:
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a delay section 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 for adding the second delayed signal to a current video signal in order to generate an added signal; a variable amplifying section for amplifying the added signal in response to a first control signal from an exterior in order to generate a first variable amplified signal, and amplifying 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 for comparing the added signal from said adder with a reference signal, and for selecting the first amplified signal or the second amplified signal according to the comparison result; and a subtracter for subtracting the first amplified signal or the second amplified signal from said select section from the first delayed signal from said delay section in order to generate a subtracted signal as a peaked video signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A circuit for peaking video signals, said circuit comprising:
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a first delay means for delaying an input luminance signal for a first predetermined time in order to generate a first delayed signal; a second delay means for delaying the first delayed signal for a second predetermined time in order to generate a second delayed signal; an adder for adding said second delayed signal to a current input luminance signal in order to generate an added signal; a first amplifier for amplifying the added signal in order to generate a first amplified signal; a comparator for comparing the first amplified signal from the first amplifier with a reference signal; a first variable amplifier for amplifying the first amplified signal according to a first control signal in order to generate a second amplified signal; a second variable amplifier for amplifying the first amplified signal according to a second control signal in order to generate a third amplified signal; a switch for selecting the second or third amplified signal according to the comparison result in order to output the second or the third amplified signal; and a subtracter for subtracting the second or third amplified signal selected by said switch from the first delay signal from said first delay means, thereby generating a subtracted signal as peaked video signal. - View Dependent Claims (9, 10)
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Specification