| 摘要 |
PURPOSE:To reduce quantization distortion in the case of performing high- efficiency coding to a video signal, which is sampled at a different phase for each line, for the unit of a block. CONSTITUTION:Based on a digital signal from an A/D converter 2, an inter- frame subsampling phase is read by a phase detector 201. When switch 3 is changed over to A, a frame memory 8 is used for write. A write address generator 203 distinguishedly generates a write address corresponding to the phase detected by the phase detector 201, and the address is supplied onto the frame memory 8 by an address selector 6. When the signal of one frame is written in the frame memory 8, the switch 3 is changed over to B, and the signal of the next frame is written in a frame memory 9. At the same time, a switch 10 is changed over to A, and reading is started. Concerning the reading, an address generated by a read address generator 5 is supplied to the frame memory 8 by the address selector 6. |
