| 摘要 |
<p>PROPOSED In a time base corrector which converts incoming video signals to digital form and writes the digitized video signals in sequentially enabled units of a main memory at a clocking rate varying generally in accordance with time base errors in the incoming signals and in which the digitized video signals temporarily stored in the memory are read out or fetched from the successive main memory units at a clocking rate which is standard, at least at the beginning and end of each video line interval and reconverted to analog form for eliminating the time base errors; velocity errors occurring in the incoming video signal are corrected by means of a velocity error memory and circuitry for writing velocity error information into the velocity error memory in conjunction with the recording of digitized video signals in each separate unit of the main memory so as to describe the velocity error of the digitized signal recorded in the respective unit. Further, circuitry is provided for reading from the velocity error memory the velocity error information corresponding to a given main memory unit in conjunction with the reading of the digitized video signal from that unit, and for modulating the clocking rate for reading the digitized video signal from that given main memory unit in accordance with the corresponding velocity error information read from the velocity error memory.</p> |
