| 摘要 |
The actual length a magnetic tape must be transported to position a particular storage address at a certain point is compared to a reference indicative of tape length decreasing at a known rate. Enabling and disabling signals are provided in response to the comparison; the enabling signal being provided when the actual and reference lengths are the same and the disabling signals when they are different. Two counters are coupled to receive the enabling and disabling signals and are associated with each other to provide an output signal when the actual tape length and reference tape length are equal for a predetermined interval and inhibit the provision of the output signal when they are not equal for the predetermined interval.
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