| 摘要 |
The respective rotations of first and second reel-rotation detection discs which are rotating in interlocking relation with a take-up reel and a supply reel, respectively, are detected by first and second reel-rotation detection members. The counting periods of first and second pulse counters are determined by the output pulses of the first and second reel-rotation detection means, respectively. These pulse counters count the outputs from a pulse generator for generating pulses related to the amount of travel of a tape. Counted values A1 and A2 are obtained by the counting operations of the pulse counters and supplied to a microcomputer which includes a CPU, ROM, RAM, and work memory. The value of A12+A22 is determined and this value is compared with specified values or constants representing the type of tape which are previously stored in RAM. In accordance with the result of this comparison, determination is made of the type of tape currently in use. Based on the kind of tape being used, other characteristics which are known allow calculation of remaining amount or time of tape left.
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