Apparatus for removing ghost component disturbing picture signal
AssigneeVictor Company of Japan, Ltd.
InventorsYuji Nishi, Shigehiro Ito, Tatsushi Kuguchi, Kazuyuki Ebihara
Life of this patent
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Abstract
An apparatus for removing a ghost component which disturbs a picture signal by means of a ghost canceling reference signal included therein. The reference signal is extracted from the picture signal and judged as to whether it has a specific level in a reference time interval. The extracted reference siganl is also judged as to whether a color burst signal is canceled. If both judgements are positive, a judgement signal is generated which allows the extracted signal to be examined how it is disturbed by the ghost component. In response to the examination, the ghost component is removed from the picture signal.
Claims4
An apparatus for removing a ghost component which disturbs a picture signal by means of a ghost canceling reference signal included therein, including:
- ghost removing filter means for removing the ghost component;
- signal extracting means for extracting the reference signal from the picture signal by canceling a color burst signal and other signal components included therein except the reference signal;
- waveform judging means for judging whether the extracted reference signal has a specific waveform;
- signal inspection means for inspecting disturbance of the extracted reference signal suffered from the ghost component, if the extracted reference signal is judged to have the specific waveform;
- and
- characteristic varying means, responsive to the inspection, for varying filtering characteristics of the filter means, wherein
- the waveform judging means comprises:
- level judging means for judging whether the extracted reference signal has a specific level in a reference time interval;
- signal judging means for judging whether the color burst signal is canceled in the extracted reference signal;
- signal outputting means for outputting a judgement signal if the extracted reference signal is judged to have the specific level in the reference time interval and the color burst signal is judged to be canceled;
- and
- gate means, responsive to the judge signal, for applying the extracted reference signal to the signal inspection means.
Dependencies are inferred from the claim text.