| 摘要 |
<p>In order to include a break slot in a broadcast video signal, the signal is first fed through a RAM recorder (24) having a variable delay. Reading of the signal from the RAM recorder (24) is controlled in such a manner that the delay produced by the RAM recorder is reduced from an accumulated value. After the delay has been reduced by a desired amount, reading out of the signal from the RAM recorder (24) is inhibited until the delay has increased again to no more than the accumulated value, thereby to produce a break slot having a duration no more than the reduction of the delay produced by the RAM recorder. The reduction of the delay produced by the RAM recorder (24) may be brought about by: skipping the reading of unwanted portions of the signal stored in the RAM recorder (24), by feeding the signal through a fixed delay RAM recorder (14) before feeding it through the variable delay RAM recorder (24) and viewing the signal before it is fed through the fixed delay RAM recorder (14) to identify portions of the signal to be edited out; or by reading from the variable delay RAM recorder (24) at a speed greater than the speed at which the signal is written to the variable delay RAM recorder (24). <IMAGE></p> |
