Electrical apparatus

Details Electrical apparatus Electrical apparatus

1987-05-27

1989-01-03

Levy, Stewart J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Analysis of complex waves

324 78R, G01R 2316

Patent

active

047959703

ABSTRACT:
Apparatus for measuring frequency includes a first period measuring counter (14) arranged to measure a periodic signal and generate a counter enable signal an integer number of cycles long, and a second period measuring counter (15) arranged to measure frequency of an input signal over a gate period given by the counter enable duration. The apparatus may be used to remove dither in the measurement of carrier frequency of FM signals.

REFERENCES:
patent: 3304504 (1967-02-01), Horlander
patent: 3909714 (1975-09-01), Nakano
patent: 4420809 (1983-12-01), Pierce

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