| 摘要 |
PURPOSE:To enhance vertical resolution by sampling input video signals by signals of the prescribed sampling frequency to record them in a recording medium and providing a clip circuit on an output stage of the low-pass filter, which filters a low band frequency component of reproduced sampling signals obtained by reproducing said signals. CONSTITUTION:Input video signals are sampled by signals of the following sampling frequency as the equation shows; it is twice or less upper limit frequency of input video signals such as luminance signals, and higher than the upper limit frequency. A subtractor 9 subtracts two reproduced sampling signals having relatively one-hour time difference, outputs the signal consisting of frequency components mulfiplied by a natural number multiple of a 1/2 horizontal frequency fH of the reproduced sampling signal, and supplies it to a low-pass filter 10. A low-band frequency component taken out from the low-pass filter 10 is supplied to a mixer 12 after its intermediate part is eliminated by a clip circuit 11. Then said component is mixed with a re-sampling signal in the mixer 12, which outputs the signal obtained by mixing two input signals as a reproduced image signal to an output terminal 13. |
