Frequency control circuits such as for use in modulation measure

Details Frequency control circuits such as for use in modulation measure Frequency control circuits such as for use in modulation measure

1975-04-03

1976-11-16

Safourek, Benedict V.

325363, 325423, H04B 1700

Patent

active

039926702

ABSTRACT:
A circuit responsive to an input signal having an unspecified frequency for converting it to a predetermined and constant means frequency, and particularly suitable for incorporation in a modulation measuring instrument, comprises a sampling mixer controlled by a variable frequency oscillator for sampling the input signal to produce an intermediate signal. The mean frequency of the intermediate signal is then compared with a reference representing a predetermined frequency value whereby to produce an error signal, and means responsive to the error signal adjusts the frequency of the oscillator in such a direction as to tend to hold the mean value of the frequency of the intermediate signal at the predetermined frequency value while preserving therein variations in amplitude and/or frequency due to amplitude and/or frequency modulation.

REFERENCES:
patent: 3512089 (1970-05-01), Cushman
patent: 3569838 (1971-03-01), Blair
patent: 3649919 (1972-03-01), Fridman et al.
patent: 3736510 (1973-05-01), Wu
patent: 3753141 (1973-08-01), Van Elk et al.

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