| 摘要 |
Horizontal and/or vertical blanking intervals can be reduced or completely eliminated from a video signal by arranging for a FIFO buffer 24 to have a faster input clock rate (input PLL 28) than its output clock rate (output PLL 32). This provides a digital video signal for transmission or the like which has a reduced data rate since the lines (and/or frames) of the video data are expanded to fill the periods previously allocated to the blanking intervals. On reception, the blanking intervals can be restored for processing or display of the video signal by an inverse technique, data being written into a buffer at a slower rate than that being read out, the beginning of read out from the buffer being delayed until the required blanking interval has elapsed. A similar technique can be applied to modification and optimisation of inconvenient blanking intervals. <IMAGE> |
