| 摘要 |
PCT No. PCT/EP86/00030 Sec. 371 Date Sep. 22, 1986 Sec. 102(e) Date Sep. 22, 1986 PCT Filed Jan. 24, 1986 PCT Pub. No. WO86/04722 PCT Pub. Date Aug. 14, 1986.A method of determining the elapsed and/or still available playing time of a magnetic tape. First, the time the spindle takes to rotate once is measured. The number of coils on the spindle are calculated from the spindle diameter, tape thickness, and duration of rotation. The results are entered in a counter that from that time on adds or subtracts one pulse per winding direction and per revolution. The counting results are compared with a table of times layed out in one-minute steps and the resulting minute values displayed.
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