Frequency measuring apparatus

Details Frequency measuring apparatus Frequency measuring apparatus

1977-10-03

1979-03-13

Tokar, M.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Phase comparison

328134, G01R 2300

Patent

active

041444914

ABSTRACT:
Frequency measuring apparatus wherein a single sideband modulator is fed by an input signal, the frequency of which is to be determined, and a reference signal having a predetermined frequency f.sub.o to produce upper and lower sideband frequency signals separated in frequency by 2f.sub.o. A delay line shifts the phase of one of such signals .phi. relative to the other one of such signals, such phase shift being related to the frequency of the input signal. The signals are then combined and detected to produce a signal having a frequency 2f.sub.o and a phase angle related to the phase shift .phi.. A phase comparator, responsive to the reference signal and the later produced signal, detects the phase of the later signal thereby providing an indication of the frequency of the input signal. With such an arrangement relatively fewer and less costly devices may be used for the frequency measuring apparatus.

REFERENCES:
patent: 3391344 (1968-07-01), Goldberg
patent: 3568067 (1971-03-01), Williford
patent: 3585508 (1971-06-01), Crowther
patent: 3783389 (1974-01-01), Gatlebet

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