| 摘要 |
PURPOSE:To reduce harmonics noise, by making aperture compensation for video signal formed with an output of a solid-state image pickup element at a profile emphasizing circuit and coinciding a drive frequency of the pickup element with a reciprocal of a delay time of a delay line of the profile emphasis circuit. CONSTITUTION:Optical image of an objective 1 is formed on a solid-state image pickup element CCD3 via a lens 2, a clock signal S0 for scanning in a CCD drive circuit 4 is operated to the CCD3, charge stored in each video element is sequentially read out to be an electric signal S10, which passes through a low pass filter 5 and a video signal S1 is formed and outputted at a profile emphasizing circuit 66 through aperture compensation. In a circuit 6, the video signal S1 becomes a signal S2 delayed by tau at a delay line 7 from a transistor (TR)TR2, is inputted to a TR3, and the signal S3 delayed by tau to the signal S2 reflected on the delay line is inputted to the collector of the TR2, a video signal Sout in aperture compensation is outputted from a TR4, the delay time tau is set to a specific value to reject noise. |
