Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1990-02-20
1992-02-18
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 78F, 324 79D, 377 19, 455 36, G01R 2310
Patent
active
050897705
ABSTRACT:
The disclosure is of a system for measuring the frequency of an audio signal by converting the signal to a rectangular wave, counting the number of oscillator pulses which can be generated during one cycle of said wave and decoding the number of pulses to obtain the frequency of the audio signal.
REFERENCES:
patent: 4146836 (1979-03-01), Zimmer
patent: 4707856 (1987-11-01), Tanaka
patent: 4733169 (1988-03-01), Grindahl
patent: 4807146 (1989-02-01), Goodrich
Boles Glenn M.
Lee Xiaoyang
Green Robert A.
Karlsen Ernest F.
Lunayach Communications Consultants
Solis Jose M.
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