Frequency detector

Details Frequency detector Frequency detector

1986-06-30

1989-01-24

Kemeny, Emanuel S.

Boots, shoes, and leggings

324 78D, 324 78R, G01R 2300

Patent

active

048005088

ABSTRACT:
Method and apparatus for determining a frequency of a series of signals. A pulse train whose frequency is to be measured is counted. The time that the counting takes place is varied to coincide with the occurrence of a beginning and an ending pulse. The pulse count is then divided by the time to give the measured frequency in hertz. The system is useful in a tachometer motor controller system.

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patent: 4052620 (1977-10-01), Brunnett
patent: 4396884 (1983-08-01), Toalson
patent: 4458194 (1984-07-01), Geppert et al.
patent: 4484137 (1984-11-01), Chang
patent: 4517548 (1985-05-01), Ise et al.
patent: 4517669 (1985-05-01), Freeburg et al.
patent: 4517679 (1985-05-01), Clark et al.
patent: 4520359 (1985-05-01), Kitagawa et al.
patent: 4541105 (1971-09-01), Lee et al.

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