| 摘要 |
PURPOSE:To reproduce a picture with good quality according to a wide range of discrete magnification by forming a memory as a hierarchical structure, storing the video image at present and just before and controlling variably the sampling frequency according to the magnification. CONSTITUTION:An analog video signal 20 is quantized at a high speed tracking circuit DZ and an obtained digital video signal 21 is applied to a write memory MM, a read memory VM and its control circuits MWC, MRC. On the other hand, a magnification signal 22 and an offset signal are inputted and they are controlled by a timing signal from a timing control circuit TC so as to reproduce a picture of good quality. |
