Television – Image signal processing circuitry specific to television – Chrominance signal amplitude control
Reexamination Certificate
2005-09-20
2005-09-20
Miller, John (Department: 2611)
Television
Image signal processing circuitry specific to television
Chrominance signal amplitude control
C348S645000, C348S679000, C348S624000
Reexamination Certificate
active
06947099
ABSTRACT:
An ACC system includes a controllable amplifier having an input coupled to receive a chroma input signal and an output for providing an chroma output signal of controllable amplitude. A first feedback path, including a cascade connection of means for providing a signal representative of a measured burst amplitude, means for providing an error signal representative of the difference between a desired burst amplitude and the measured burst amplitude, and an integrator, is coupled between the output of the controllable amplifier and a gain control input of the controllable amplifier. A second feedback path, coupled from an output of the integrator to an input thereof, reduces the gain of the amplifier means in a controlled manner for values of a burst component of the chroma input signal below a predetermined threshold value provided by a control signal source, the reduction being at a predetermined rate controlled by a scaling signal device, thereby providing an output system response characteristic having a precisely controllable knee and slope below a predetermined amplitude of a burst component of the chroma input signal.
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Keen Ronald Thomas
Rumreich Mark Francis
Kiel Paul P.
Miller John
Shedd Robert D.
Thomson Licensing
Tripoli Joseph S.
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