Digital rate detection circuit

Details Digital rate detection circuit Digital rate detection circuit

1985-12-16

1988-01-26

Miller, Stanley D.

Electrical pulse counters, pulse dividers, or shift registers: c

Applications

Measuring or testing

377 45, 324162, 364426, 364566, H03K 2100, H03K 2300

Patent

active

047220945

ABSTRACT:
A device for measuring the rate of change of speed of a machine such as a turbine engine which includes a digital counter for counting a speed signal having a frequency proportional to engine speed for a predetermined period of time and decrementing said count for a second period of time with the counting periods being proportional to engine speed. The up and down counts are derived by dividing a fixed frequency clock signal by a number proportional to engine speed to generate a variable frequency signal which frequency is proportional to engine speed. The difference between the up and down counts generates a remainder signal which is compared to predetermined limits.

REFERENCES:
patent: 3731301 (1973-05-01), Davis
patent: 4070562 (1978-01-01), Kuno et al.
patent: 4341996 (1982-07-01), Coffman
patent: 4408290 (1983-10-01), Kubo et al.

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