| 摘要 |
PURPOSE:To function an automatic gain control loop, and to output a delay output signal of which the signal level is stabilized, by detecting a difference between input/output levels in an analog delay line, and controlling the gain of a variable gain amplifier. CONSTITUTION:A reproducing luminance signal is clamped at a clamping circuit 2, and is supplied to a CCD delay line 4 which gives a delay quantity of 1H+ nbit, and a delay line 5 which gives a delay quantity of nbit. A signal subtractor 6 detects a stroke component, and a signal subtractor 8 outputs a reproducing luminance signal from which a cross talk component is eliminated through a voltage controlled type variable gain amplifier 9. A clamping circuit 12 clamps a 1H delay signal supplied through a voltage controlled type variable gain amplifier 12, and supplies it is a level comparator 13, and the level comparator 13 performs a gain control for voltage controlled type variable gain amplifiers 11 and 9 with a compared error output between the clamping circuits 2 and 12, and always makes coincident with the signal level of the input and the output of the CCD delay line 4.
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