| 摘要 |
Time base errors, such as are introduced in video or other information signals by the recording and/or reproducing thereof, are removed by writing successive line or other intervals of the video signals in a memory at a clocking rate which varies generally in accordance with the time base errors, and by reading out the video signals from the memory at a standard clocking rate. The memory is composed of at least three registers having repeating cyclic orders or sequences of writing and reading, respectively, and the video signals being read out of each register are recycled or rewritten in the same register. The reading and writing operations are controlled so that the occurrence of excessive time base errors causes the writing or reading period of a register to be extended, for example, from a normal one line interval to two line intervals, so as to either omit or repeat, respectively, a line interval of the video signals in the output from the time base corrector. Further, in response to a detected drop out in the incoming video signals, the writing period of a register is extended so as to omit or delete the line interval containing the drop out from the temporarily stored video signals and, during reading out of the stored signals, the line interval preceding the deleted line interval is read twice to replace the omitted line interval.
|
