Circuit for converting a frequency of an input signal so a signa

Details Circuit for converting a frequency of an input signal so a signa Circuit for converting a frequency of an input signal so a signa

1992-07-30

1994-10-18

Strecker, Gerard R.

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

324 7639, 324 7644, 324 7647, 324146, 364565, G01P 3481, G01P 3489, G01R 2310

Patent

active

053571967

ABSTRACT:
A measuring circuit with a simple circuit configuration is capable of correcting dispersion of a characteristic of a display apparatus and of displaying the measurement result. The measuring circuit comprises an edge detecting circuit, for outputting an edge detection signal synchronous with clock pulses by performing sampling on an input signal, the sampling being performed using clock pulses having a frequency higher than a frequency of the input signal, a gate circuit outputting a first factor when receiving the edge detection signal from the edge detection circuit, a digital integrating filter circuit for outputting a signal having digital values converging to values corresponding to the frequency of the input signal by timing sampling operation based on cycles of the clock pulses.

REFERENCES:
patent: 4208626 (1980-06-01), Gregg, Jr.
patent: 4521867 (1985-06-01), Kasuga
patent: 4580047 (1986-04-01), Sasaki et al.
patent: 4841238 (1989-06-01), Birch
patent: 4962470 (1990-10-01), Hansen
patent: 4977525 (1990-12-01), Blackwell
patent: 5007035 (1991-04-01), Markow et al.
Papoulis, Athanasious, Circuits & Systems: A Modern Approach, p. (5.101) ISBN 0-03-056097-7, Copyright 1980 by Holt Rinehart and Winston, Inc. (no month).

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