Video signal processing apparatus
AssigneeSharp Kabushiki Kaisha
InventorKoji Oiwa
Life of this patent
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Abstract
Burst signal sampling means comprising synchronous separator circuit(s) 31, waveshaping circuit(s) 32, bandpass amplifier circuit(s) 33, and burst separator circuit(s) 34 is or are provided in order to extract burst signal(s) from video signal(s) output from video amplifier circuit(s) 24; level converting means comprising ACC detector/amplifier circuit(s) 35 is or are moreover provided in order to convert fluctuation in burst signal(s) to DC voltage(s); and such DC voltage(s) is or are fed back by way of intervening control circuit(s) 36 to the cathode side(s) of input tuning variable capacitance diode(s) constituting frequency characteristics correction circuit(s) of input tuning circuit(s) 11.
Claims10
A video signal processing apparatus characterized in that it is equipped with
- one or more burst signal sampling means for extracting one or more burst signals from one or more video signals;
- one or more level converting means for converting to DC voltage or voltages at least one variable intensity level of at least one of the burst signal or signals extracted by at least one of the burst signal sampling means;
- and
- one or more image quality correcting means for causing at least one of the DC voltage or voltages obtained as a result of conversion by at least one of the level converting means to be fed back into one or more compensator subcircuits of one or more input tuning circuits so as to permit correction of frequency characteristics of at least one of the video signal or signals such that intensity level at one or more high frequency bands is constant relative to intensity level at one or more low frequency bands.
A video signal processing apparatus characterized in that it is equipped with
- one or more burst signal sampling means for extracting one or more burst signals from one or more video signals;
- one or more level converting means for converting to DC voltage or voltages at least one variable intensity level of at least one of the burst signal or signals extracted by at least one of the burst signal sampling means;
- and
- one or more image quality correcting means for causing at least one of the DC voltage or voltages obtained as a result of conversion by at least one of the level converting means to be fed back into one or more compensator subcircuits of one or more interstage tuning circuits so as to permit correction of frequency characteristics of at least one of the video signal or signals such that intensity level at one or more high frequency bands is constant relative to intensity level at one or more low frequency bands.
Dependencies are inferred from the claim text.