Digital frequency deviation meter

Details Digital frequency deviation meter Digital frequency deviation meter

1978-06-29

1980-11-25

Tokar, Michael J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 79R, G01R 2302

Patent

active

042361109

ABSTRACT:
A digital frequency deviation meter for measuring the deviation of an FM signal from a center frequency is disclosed. An incoming FM signal is applied to a counter which is cycled through a series of sequential nonambiguous cyclical states. A storage memory, actuated at a center frequency produced by a timer, is provided for storing information about the present and immediately preceding sampled states of the counter. Operating synchronously with the timer is a detector that responds to the differences in magnitude and direction between the present and immediately preceding sampled states of the counter and generates a pulse when a state difference is detected. A frequency counter counts the pulses which are output at a rate proportional to the frequency deviation. To maintain the timer at center frequency a phase lock loop is provided.

REFERENCES:
patent: 4122391 (1978-10-01), Harp
patent: 4123704 (1978-10-01), Johnson

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