Frequency sample-and-hold circuit

Details Frequency sample-and-hold circuit Frequency sample-and-hold circuit

1975-02-13

1976-06-08

Safourek, Benedict V.

Telegraphy

Systems

Line-clearing and circuit maintenance

328 63, H04L 702

Patent

active

039625419

ABSTRACT:
A method and apparatus are described for reproducing the frequency of an incoming reference signal that persists for only a limited period of time. This is accomplished by counting, during the duration of the reference signal, the number of cycles of a local clock occurring between zero crossings of the reference signal, and storing the count thus obtained. After the termination of the reference signal, a secondary signal is produced whose zero crossing intervals are substantially equal to the stored count multiplied by a period of time that is defined by the local clock. Two applications of frequency sample-and-hold are described.

REFERENCES:
patent: 3384821 (1968-05-01), Beck
patent: 3582795 (1971-06-01), Heick
patent: 3619505 (1971-11-01), Meile
patent: 3710262 (1973-01-01), Sorensen

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