Circuit for removing jitter of chrominance signal and television

Details Circuit for removing jitter of chrominance signal and television Circuit for removing jitter of chrominance signal and television

1990-10-01

1992-10-06

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 21R, 358 20, 358326, H04N 595, H04N 989

Patent

active

051537141

ABSTRACT:
A frequency of a chrominance signal including a jitter component and separated from a color video signal is converted from a first frequency to a second frequency by first frequency converting device. Then, the chrominance signal which frequency is converted to the second frequency is converted to have the original frequency by second frequency converting device. Each of the first frequency converting device and the second frequency converting device includes a multiplier and a bandpass filter. One multiplier of the first and the second frequency converting devices and receives a frequency signal corresponding to a phase difference between a reference frequency signal and a color burst signal separated from the chrominance signal. As a result, the jitter component is removed from the chrominance signal either in the first or the second frequency converting. In the first and the second frequency converting devices and, the input signal and the output signal so widely differ from each other in frequency that the respective frequency components included in the output signal of the multipliers in the respective frequency converting device expend widely along an axis of a frequency. As a result, the bandpass filter in each frequency converting device is enabled to easily extract only a signal of a desired frequency component.

REFERENCES:
patent: 3619491 (1971-11-01), Fujita
patent: 3733432 (1973-05-01), Arimura et al.
patent: 3974520 (1976-09-01), Kuroyanagi
patent: 4157565 (1979-06-01), Kuniyoshi et al.
patent: 4208674 (1980-06-01), Kuniyoshi et al.
patent: 4209800 (1980-06-01), Yamamitsu

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