| 摘要 |
<p>An image processing system comprising a first and second video signal sources (1, 2) providing a main-field video signal and sub-field video signal, respectively, means for compressing the sub-field video signal on the time axis, and a signal merging unit (26) which merges the compressed sub-field video signal into the main-field video signal and delivers the resulting signal to a television receiver set, wherein the signal compressing means comprising a dual-port memory (12) having a first and second ports (60, 62) and operating to compress the sub-field video signal on the time axis and store the compressed signal, and control means (13, 14) for controlling the reading and writing of the memory for the sub-field video signal, the control means comprising a first control section for writing the sub-field video signal into the first port of said memory, a second control section for trasferring a signal from the first port to the second port, and a third control section for reading out a signal from the second port, said memory implementing the reading operation and writing operation in asynchronous manner.</p> |
