Method and apparatus for measuring the speed at which a tape...

Details Method and apparatus for measuring the speed at which a tape... Method and apparatus for measuring the speed at which a tape...

G - Physics

11

B

352/21.22

G11B 15/52 (2006.01) G11B 15/46 (2006.01) G11B 15/54 (2006.01)

Patent

CA 1068397

ABSTRACT OF THE DISCLOSURE A tape speed measuring circuit for use with quadruplex video recorder/reproducers, which identifies the speed at which the recording was made to allow auto- matically switching to the correct speed upon playback. The circuit measures the ratio of control track frequency relative to the capstan tach frequency to obtain the re- corded tape speed. A commutating filter means responsive to the capstan tach signal allows the accurate extraction of the desired control track signal component at all tape speeds, Divider means counts the number of tach pulses received during a selected time period. If the number of pulses is more or less than a pre-selected quantity, a high or low logic level respectively is generated commen- surate with the standard 15 or 7-1/2 inches/second recorded tape speed. -2-

263550

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