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Adjuster for colour killer

A technology of adjusting device and decolorizer, applied in the direction of color signal processing circuit, etc.

Inactive Publication Date: 2004-04-21
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the existing method of changing by design of the external circuit, a physical operation of changing the external parts and their constants for each model is required

Method used

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  • Adjuster for colour killer
  • Adjuster for colour killer

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Experimental program
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Effect test

Embodiment Construction

[0008] Embodiments of the present invention will be described below with reference to the drawings. exist figure 1 Among them, 1 is an EEPROM (electrically erasable memory) that stores the control signal for determining the working point of the decolorizer, 2 is the CPU that reads out the control signal of the EEPROM1, and 3 is the control signal output from the CPU2, It is transmitted in the form of a bus, and the bus interface circuit is connected with the control signal that can be transmitted.

[0009] 4 is the decolorizer control circuit that generates the standard voltage according to the control signal output by the bus interface circuit 3, and 5 is the standard voltage Vref output by the decolorizer control circuit 4 and the value representing the color burst signal in the color signal output from the terminal 6. A comparator for level comparison of signals.

[0010] 7 is a BPA (band-pass amplifier) ​​that changes the size of the color signal output from terminal 8, ...

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PUM

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Abstract

The color killer adjuster for adjusting the color killer operation point for eliminating color signals in image signals comprises a CPU (2) for generating a control signal stored to determine a color killer operating point, a color killer control circuit (4) for generating a reference voltage, based on the control signal from the CPU, and a comparator (5) for comparing the level of a signal representing the size of a burst signal in the color signals with the reference voltage from the color killer control circuit to eliminate color signals in the image signals according to the comparison result. The invention is to provide a method of simply setting up the operation point of a color killer without executing such work as physical works for changing outside attaching components or their parameters every model in the conventional changing method according to the design of an outside attaching circuit.

Description

technical field [0001] The present invention relates to a color erasing device adjusting device used in a TV (television) receiver, in particular to a color erasing device adjusting device suitable for a situation where a CPU (microcomputer) and a TV signal processing IC are integrated or formed on one chip. Background technique [0002] TV receivers have the function of decolorizer to consciously erase all color signals when the received signal state is degraded under the condition of weak electric field, etc. As a specific method, the color burst signal in the color signal is converted into a smooth DC (direct current) voltage. The levels of the converted DC voltage and the standard voltage are then compared. If the result of the comparison is that the converted DC voltage is larger than the standard voltage, the color signal is used as it is, and if the converted DC voltage is smaller than the standard voltage, the color signal is prohibited. The result is a nice image....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N9/70
CPCH04N9/70
Inventor 植木敬次郎
Owner SANYO ELECTRIC CO LTD