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| Video signal selecting device |
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| Method and apparatus for constructing, storing and displaying characters |
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| Method and apparatus for providing dual language captioning of a television program |
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| Methods and apparatus for concurrently acquiring video data from multiple video data sources |
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| Compressed data recording method using integral logical block size and physical block size ratios |
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| Apparatus and method for extracting a portion of an image |
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| Chrominance signal reproducing apparatus for video tape recorder |
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Circuit for removing jitter of chrominance signal and television set using the same
| Details |
Inventors: Ugaki, Hidehiro; Hirao, Yoshichika; Hosoya, Nobukazu;
Assignee: Sanyo Electric Co., Ltd. (Osaka, JP)
Primary Examiner: Groody; James J.
Assistant Examiner: Burgess; Glenton B.
Attorney, Agent or Firm: Armstrong, Nikaido, Marmelstein, Kubovcik & Murray
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. |
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DETAILED DESCRIPTION An object of the present invention is to provide a circuit for removing jitter of a chrominance signal capable of removing jitter component almost completely which cannot be removed by a conventional jitter removing circuit.
Another object of the present invention is to provide a television set comprising a jitter removing circuit having a simple arrangement and capable of removing jitter component of a chrominance signal almost completely.
The jitter removing circuit according to the present invention is a circuit for removing jitter component from a chrominance signal included in a color video signal, including first and second frequency converting devices, separating devices, reference frequency signal generating devices, a phase comparing device and a variable frequency oscillating device.
The first frequency converting device includes first multiplying means and a first bandpass filter, and converts a frequency of the chrominance signal separated from the color video signal from a first frequency to a second frequency.
The second frequency converting device includes second multiplying device and a second bandpass filter, and reconverts the frequency of the chrominance signal output from the first frequency converting device to the first frequency.
The separating device separates a color burst signal from the chrominance signal output from the second frequency converting device.
The reference frequency signal generating device generates a reference frequency signal of a chrominance subcarrier frequency.
The phase comparing device compares phases of the color burst signal separated by the separating device and the reference frequency signal.
The variable frequency oscillating device has an oscillating frequency fluctuating in response to the output of the phase comparing device.
The first multiplying device included in the first frequency converting device multiplies the chrominance signal separated from the color video signal and a first signal together.
The first bandpass filter included in the first frequency converting device limits the band width of the output signal of the first multiplying device, with the second frequency as a center frequency
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TV Signal 
