Velocity detection circuit

Details Velocity detection circuit Velocity detection circuit

1994-11-23

1996-02-20

Psitos, Aristotelis

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 4428, 369 4434, G11B 700

Patent

active

054935504

ABSTRACT:
A velocity detection circuit which detects the velocity of movement of an optical head. The velocity detection circuit includes an edge detection circuit for detecting an edge of a position detection signal and outputting an edge signal, a divider for dividing a clock signal of a predetermined period, a first binary counter and a first D-type flipflop for counting the number of pulses of the divided clock signal within an interval from an edge signal to a next edge signal to calculate time data, a second binary counter for counting the clock signal, a comparator for outputting, when the time data outputted from the first D-type flipflop and the data counted by the second binary counter coincide with each other, a pulse (reference signal) to be used to reset the count data of the second binary counter, and a third binary counter and a second D-type flipflop for counting the number of pulses of the comparison signal based on a sampling signal generated at fixed time intervals to calculate velocity data.

REFERENCES:
patent: 5157645 (1992-10-01), Takahara et al.
patent: 5216651 (1993-06-01), Hwang
patent: 5327410 (1994-07-01), Gleim et al.
patent: 5428591 (1995-06-01), Lee
patent: 5457671 (1995-10-01), Takata et al.

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