Circuit for removing jitter of chrominance signal and television set using the same.

摘要

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 means 51. Then, the chrominance signal which frequency is converted to the second frequency is converted to have the original frequency by second frequency converting means 52. Each of the first frequency converting means 51 and the second frequency converting means 52 includes a multiplier and a bandpass filter. One multiplier of the first and the second frequency converting means 51 and 52 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 form the chrominance signal either in the first or the second frequency converting means 51 or 52. In the first and the second frequency converting means 51 and 52, 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 means expend widely along an axis of a frequency. As a result, the bandpass filter in each frequency converting means is enabled to easily extract only a signal of a desired frequency component.