US 2006/0139496 A1Published application

Video signal processing apparatus

AssigneeSanyo Electric Co., Ltd.

InventorsHiroshi Matsui, Masato Onaya

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Abstract

A video signal processing apparatus receives a video signal containing at least a luminance signal and a color difference signal. A trap filter attenuates a frequency band of the color difference signal to separate the luminance signal from the video signal. A bandpass filter attenuates a frequency band of the luminance signal to separate the color difference signal from the video signal. The trap filter is constituted by a switched capacitor filter that outputs the luminance signal with a delay time equivalent to a time difference between a delay time of the processing performed in a succeeding luminance signal processing circuit and a delay time of the processing performed in a color difference signal processing circuit. With this arrangement, the circuit scale of a filter circuit can be reduced and frequency characteristics of the filter can be stabilized.

Claims4

Dependent claims

A video signal processing apparatus receiving a video signal containing at least a luminance signal and a color difference signal, comprising:

a trap filter for attenuating a frequency band of the color difference signal to separate the luminance signal from the video signal;
a bandpass filter for attenuating a frequency band of the luminance signal to separate the color difference signal from the video signal;
a luminance signal processing circuit for applying predetermined processing to the luminance signal produced from the trap filter;
and
a color difference signal processing circuit for applying predetermined processing to the color difference signal produced from the bandpass filter,
wherein the trap filter is arranged by a switched capacitor filter that outputs the luminance signal with a delay time equivalent to a time difference between a delay time of processing performed in the luminance signal processing circuit and a delay time of processing performed in the color difference signal processing circuit.

3 more elements

Dependencies are inferred from the claim text.