Frequency indicating system

Details Frequency indicating system Frequency indicating system

1970-11-02

1977-07-19

Wilbur, Maynard R.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 77A, 324 77B, G01R 2314

Patent

active

040371522

ABSTRACT:
Disclosed is an apparatus and process for indicating or measuring the frequency of an incoming signal of unknown frequency. The system includes a plurality of processing channels, each of said channels including a pair of oscillators offset in frequency coupled to a pair of harmonic generators for producing respective output signals harmonically related, wherein the fundamental frequency of said harmonic generators are correspondingly offset. A combination of mixers, filters, amplifiers, and frequency-to-voltage convertors are utilized in combination with logic comparator means for producing analog voltage signals representative of the unknown frequency. Examples of utilization and display of these analog signals are illustrated.

REFERENCES:
patent: 2525679 (1950-10-01), Hurvitz
patent: 3364426 (1968-01-01), Hurvitz
patent: 3416081 (1968-12-01), Gutleber
patent: 3467859 (1969-09-01), Nixon et al.
patent: 3593184 (1971-07-01), Herrero

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