Television – Image signal processing circuitry specific to television – Color killer
Patent
1995-10-24
1997-05-06
Hsia, Sherrie
Television
Image signal processing circuitry specific to television
Color killer
348647, 348644, H04N 970, H04N 968
Patent
active
056275994
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.
Hsia Sherrie
LG Electronics Inc.
LandOfFree
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