| 摘要 |
PURPOSE:To attain high-speed random access and to shorten a retrieving time by changing a tape speed in response to an address difference between a retrieving destination and the present position. CONSTITUTION:The address of a retrieving destination is supplied to a latch circuit 17. While the present position address on a tape is read out by a head 11 and supplied to an address reproducing circuit 15 via a switch 12. The difference of both addresses is calculated by an address difference calculating circuit 20, and the value of said address difference is decided by an address difference deciding circuit 21. The standard of this decision is previously selected properly by the speed of a high-speed FF/FR and a low-speed FF/FR. When the address difference is larger than the standard value, a high-speed FF/FR action is carried out. While a low-speed FF/FR action is performed when the address difference is smaller than the standard value. |
