| 摘要 |
AN CONTOUR CORRECTING CIRCUIT FOR CORRECTING THE CONTOUR WITHOUT DETERIORATION OF IMAGE QUALITY OF THE VIDEO SIGNAL, COMPRISING A FIRST HPF FOR EXTRACTING THE HIGH FREQUENCY SIGNAL COMPONENT OF THE VIDEO SIGNAL SUPPLIED FROM AN INPUT TERMINAL TIN, A SECOND HPF FOR DIFFERENTIATING THE OUTPUT OF THE FIRST HPF ADDITIONALLY, AND A CORRELATOR FOR SYNTHESIZING THE OUTPUT SIGNALS OF THE OUTPUT AND THE INVERTED OUTPUT OF SAID FIRST HPF, AND THE OUTPUT OF THE SECOND HPF TO FORM A SIGNAL HAVING A PREDETERMINED SIGNAL WAVEFORM,WHEREIN THE CORRELATOR FORMS A SIGNAL WAVEFORM OF THE PRESHOOT PORTION AND OVERSHOOT PORTION WITH THE FIRST ORDER DIFFERENTIAL OUTPUT WHICH IS RELATIVELY STATIC AT THE INFLECTION POINT OF THE VIDEO SIGNAL, SYNTHESIZES A SECOND ORDER DIFFERENTIAL WAVEFORM SO AS TO BE A SHARP SIGNAL WAVEFORM AT THE MIDDLE PORTION, AND PERFORMS SHARPNESS PROCESSING OF THE VIDEO SIGNAL SIGNAL BY USE OF THE CONTOUR CORRECTION SIGNAL.
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