Opto-electronics Inc.

William P Owen

Judd Sheets

An improved frequency counter for more reliably reading the frequency of low level signals by employing a method of separating the desired signal from undesirable noise related signals, wherein the frequency counter comprises signal input amplifier circuitry, a frequency modulator circuit for phase shifting the self-oscillation frequency of the undesired signal to isolate it from the valid signal, a prescaler circuit, a frequency or pulse counter driven by the output of the prescaler, and a correlator circuit for differentiating the self-oscillation frequencies from the main signal frequency so as to reduce false correlations between the self-oscillation, or noise, and valid signals.

Frequency counter with reduced false correlations

An improved frequency counter for detecting and distinguishing a main input signal from amplifier generated self-oscillating signals, wherein the frequency counter generally includes an input circuit having an amplifier and Schmitt-Trigger, a microprocessor for controlling the main gate to a main counter and user inputs, and a signal level display, all of which communicate with the main counter, a display driver and a frequency display for more accurate frequency measurements.

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Ft. Lauderdale, FL, United States of America

William P Owen