Reel to reel tape radius measurement apparatus and method therefor
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United States of America Patent
Stats
-
Mar 21, 1989
Grant Date -
N/A
app pub date -
Apr 19, 1988
filing date -
Apr 19, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a reel to reel tape transport system for determining the radii of the reel to reel tape by generating a series of forward and reverse pulses from a brushless DC motor driving the reel to reel tape, generating a forward series of pulses when said tape is turning in the forward direction and a reverse series of pulses when the tape is turning in the reverse direction, using a state machine to determine a forward or reverse revolution of the tape despite tape reversals before the completion of the revolution, and a counter and decoder for decoding the output of the state machine to provide an accurate determination of one revolution of the brushless DC motor.
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