| 摘要 |
A magnetic tape position measuring system utilizes a detector and counter circuit which is responsive to the prerecorded control track signal of a magnetic tape recording as a position measuring signal on playback for improved accuracy. A second detector monitors the presence or absence of the prerecorded control track signal and in the absence of, or interruption of, the control track signal switching circuits automatically switch the measuring system to the magnetic tape driven tachometer signals so as to maintain a continuous position measure.
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