Frequency counter with reduced false correlations

Details Frequency counter with reduced false correlations Frequency counter with reduced false correlations

1995-11-22

1998-01-20

Trans, Vincent N.

Boots, shoes, and leggings

324 7648, 324 7662, 324 7674, G01R 2300, G06F 1700

Patent

active

057107106

ABSTRACT:
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.

REFERENCES:
patent: 4027146 (1977-05-01), Gilmore
patent: 4350950 (1982-09-01), Waldmann et al.
patent: 4424482 (1984-01-01), Drogin
patent: 4651089 (1987-03-01), Haigh
patent: 4882740 (1989-11-01), Abe et al.
patent: 5323104 (1994-06-01), Lindell
patent: 5373236 (1994-12-01), Tsui et al.
patent: 5379390 (1995-01-01), Searing et al.
patent: 5471402 (1995-11-01), Owen

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