| 摘要 |
An audio-video signal storage device of the type in which a magnetic tape is advanced in increments of one or more intertrack spacing intervals is enhanced for continuous incrementing by a servosystem comprising a pair of electromagnetic transducers spaced apart along one portion of the tape at an interval of one-half (or an odd multiple) of the increment and a generator establishing a reference pulse at a time of predetermined, preferably maximum velocity of the tape as it is being incremented. That reference pulse is applied to one of the transducers for recording on one portion of the tape. As that portion of the tape is incremented the other of the transducers reproduces that pulse and it is compared in time with a subsequent reference pulse from the generator for producing an error signal. The error signal indicates concurrent, leading, or lagging conditions for operating conventional speed controlling servosystems. Address information for direct access of information stored on the tape is recorded and reproduced with the same two servomechanism sensing transducers and conventional access mechanism control circuitry.
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