| 摘要 |
<p>In a time base corrector incorporated a video tape recorder, if a time during which a vertical synchronizing signal is written in a memory unit (2) exceeds one horizontal period segment, the video signal stored at the first address of the memory unit (2) is dropped out during data reading operation. To overcome the above problem a write address designation signal (ADW) is once latched in response to a vertical synchronizing signal (PBV) a predetermined number is subtracted from the latched address number; the subtracted a address number is loaded in a counter (16) in response to a reference vertical synchronizing signal (REFV) and is incremented in response to a reference horizontal synchronizing signal (REFH) in order to shift the read start address, thus preventing video signals stored in the memory unit (2) from being dropped off.</p> |
