Frequency data converter and meter apparatus

Details Frequency data converter and meter apparatus Frequency data converter and meter apparatus

1997-08-21

1998-06-02

Trammell, James P.

Boots, shoes, and leggings

364565, 364572, 36472406, 364734, 364 7644, 364166, 364143, G01P 348, G01P 3481, G01P 3489, G01R 1136

Patent

active

057610746

ABSTRACT:
In one data updating period, an edge pulse signal generator detects an edge of a pulse signal, and generates a one-shot pulse signal. A digital filter performs digital filter processing of the one-shot pulse signal, and outputs one frequency data. An averaging circuit adds k (positive integer) frequency data output from the digital filter in k data updating periods, and calculates average value data as an average value of the k frequency data. Furthermore, the averaging circuit sets a period in which the value of the average value data is held to be a constant value to be k times the data updating period. A PWM conversion circuit converts the average value data into PWM data by pulse-width modulation.

REFERENCES:
patent: 4988944 (1991-01-01), Ito
patent: 5017861 (1991-05-01), Hukuda
patent: 5051688 (1991-09-01), Murase et al.
patent: 5177373 (1993-01-01), Nakamura
patent: 5218291 (1993-06-01), Murase
patent: 5313155 (1994-05-01), Yamamoto et al.
patent: 5315536 (1994-05-01), Murase et al.
patent: 5357196 (1994-10-01), Ito
patent: 5448163 (1995-09-01), Murase
patent: 5448508 (1995-09-01), Ono et al.

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