| 摘要 |
PURPOSE:To attain a less-expensive and small-sized circuit, by using a 1-frame delay circuit consisting of semiconductor delay elements, and suppressing noise component in a picture signal through analog signal processing. CONSTITUTION:In a semiconductor delay element 1, an input video signal from an input terminal 5 converted in series-parallel at an input shift register 3 is transferred to transfer sections 21-2n with a vertical transfer clock pulse from a clock generator 6, applied to an output shift register 4, where parallel-series conversion is done, delayed for one-frame period at being an analog signal and a delayed composite video signal is outputted to an output terminal 15 via a process circuit 14. An inter-frame difference signal consisting of an input reproduction composite video signal and a 1-frame delay reproduction composite video signal picked up from a subtractor 18 is provided with a coefficient at a coefficient device 23 through a dynamism correction circuit 22, the S/N improving characteristic is changed, the signal is applied to a subtractor 19, where the input reproduction composite video signal fed from an input terminal 17 is subtracted. Thus, the noise component is suppressed and the signal is outputted to an output terminal 24. |
