US 5,627,599 AGranted

Chrominance signal processing apparatus for digital television receiver

AssigneeLG Electronics Inc.

InventorSung-Hoon Hong

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Abstract

A chrominance signal processing apparatus for a digital television receiver, comprising an A/D converter for converting a transmitted analog composite video signal into a digital signal in response to a clock frequency, a luminance/chrominance separation circuit for separating luminance and chrominance signals from an output signal from the A/D converter, a delay circuit for delaying the separated luminance signal for a predetermined time period, an ACC circuit for controlling an amplitude of the separated chrominance signal, a chrominance demodulator for detecting color difference signals from an output signal from the ACC circuit, a color killer circuit for detecting a maximum amplitude value of a color burst signal from the separated chrominance signal to generate a color killer signal, a first multiplexing circuit for selecting one of the output signal from the A/D converter and an output signal from the delay circuit in response to the color killer signal, a second multiplexing circuit for selecting the color difference signals or low level signals in response to the color killer signal, a D/A conversion circuit for converting output signals from the first and second multiplexing circuits into analog signals, and a matrix unit for combining output signals from the D/A conversion circuit to produce primary color signals.

Claims35

Dependent claims

A chrominance signal processing apparatus for a digital television receiver, comprising:

analog/digital conversion means for converting a transmitted analog composite video signal into a digital signal in response to a clock frequency;
luminance/chrominance separation means for separating a luminance signal and a chrominance signal from an output signal from said analog/digital conversion means;
delay means for delaying the luminance signal from said luminance/chrominance separation means for a predetermined time period;
automatic color control means for controlling an amplitude of the chrominance signal from said luminance/chrominance separation means;
chrominance demodulation means for detecting color difference signals from an output signal from said automatic color control means;
color killer means for detecting a maximum amplitude value of a color burst signal from the chrominance signal from said luminance/chrominance separation means, comparing the detected maximum amplitude value of the color burst signal with a predetermined reference level and outputting a color killer signal in accordance with the compared result;
first multiplexing means for selecting one of the output signal from said analog/digital conversion means and an output signal from said delay means in response to the color killer signal from said color killer means;
second multiplexing means for selecting the color difference signals from said chrominance demodulation means or low level signals in response to the color killer signal from said color killer means;
digital/analog conversion means for converting output signals from said first and second multiplexing means into analog signals;
and
matrix means for combining output signals from said digital/analog conversion means to produce primary color signals and outputting the produced primary color signals to a monitor.

8 more elements

Dependencies are inferred from the claim text.