| 摘要 |
PURPOSE:To obtain an outline correcting circuit which can supply an effective outline correction even with respect to a demodulated video signal whose phase characteristic is not flat, by executing addition and subtraction based on outputs of plural delay lines connected in series to an input terminal. CONSTITUTION:An input original signal inputted from an input terminal 1 goes to a signal which is delayed by TD1+TD2 by the first delay line 3 and the second delay line 8, and it is added to the input original signal by the first adder 9 and goes to a signal whose outline part is stepwise. Also the output of the first delay line 3 is amplified to about two times by an amplifier 4 and provided to a positive polarity input terminal of the first differential amplifier 5. From the frist differential amplifier 5, an outline correcting signal which has subtracted the output of the first adder 9 from an output of the amplifier 4 is obtained. On the other hand, from the second differential amplifier, an overshoot correcting signal which has subtracted the output of the first delay line 3 from an output of the third delay line 8 is obtained, and by adding this signal, said outline correcting signal and the output of the first delay line, an output signal whose outline is corrected is obtained.
|
