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Video signal processing circuit and video signal processing method

A technology for video signal processing and composite video signals, applied in the field of processing circuits, capable of solving problems such as display image interference

Inactive Publication Date: 2005-11-16
SONY CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0032] Thus, in a digital chrominance demodulation system configured corresponding to a plurality of inputs of a composite video signal, for example, the switching of the system clock frequency which is inevitably performed in association with the determination operation of the television system results in Interference with displayed image at clock frequency

Method used

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  • Video signal processing circuit and video signal processing method
  • Video signal processing circuit and video signal processing method
  • Video signal processing circuit and video signal processing method

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Embodiment Construction

[0047] A chrominance demodulation system as a video signal processing circuit as an embodiment of the present invention will be described below.

[0048] The chroma demodulation system of the present embodiment is included in, for example, television receivers and monitor equipment, and is designed to perform Y / C separation processing and chroma demodulation by digital signal processing as demodulation processing on composite video signals processed so as to output a color-difference signal as a luminance signal as a digital signal.

[0049] In addition, the chrominance demodulation system of this embodiment corresponds to a plurality of inputs of composite video signals. In other words, it is designed to perform demodulation processing (Y / C separation processing and chrominance demodulation processing) of composite video signals corresponding to the input of composite video signals of different television systems.

[0050] The instructions below follow in the following order...

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Abstract

In a digital chroma demodulating system, when directly outputting A / D converted composite signals, while switching system clock frequencies to determine the signal format, images to be displayed in accordance with the composite signals are prevented from varying and becoming unsightly due to the switching of system clock frequencies. As to the system clock frequency (m)(= fsc*n) for synchronization with a color burst signal, its coefficient (n) is changed in accordance with the format (a color burst signal frequency), thereby confining the system clock frequency (m) for formats within a given range. As a result, a nearly constant sampling frequency can be used to perform A / D conversions of the composite signals, so that sampling conditions such as the sampling frequency and sampling points will not significantly vary.

Description

technical field [0001] The present invention relates to a video signal processing circuit having a function for, for example, separating a luminance signal and a chrominance signal from a video signal (composite video signal) by so-called YC separation processing, and demodulating the thus separated chrominance signal A circuit configuration for processing, the invention also relates to a method for processing a circuit. Background technique [0002] In television receivers, monitor equipment and the like are provided, such as a chroma demodulation system, for separating a luminance signal (Y signal) and a chrominance signal (C signal) from an input composite video signal, and further from the The color difference signal is demodulated from the chrominance signal. In recent years, the above-mentioned chrominance demodulation system is constituted by digital circuits, and thus chrominance demodulation performed by digital signal processing has been proposed and realized. ...

Claims

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Application Information

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IPC IPC(8): H04N9/44
Inventor 长峰孝有田村孝彦上岛淳
Owner SONY CORP