SIGNAL PROCESSOR, AND VOLTAGE MEASURING INSTRUMENT AND CURRENT MEASURING INSTRUMENT USING SIGNAL PROCESSOR

Title:

SIGNAL PROCESSOR, AND VOLTAGE MEASURING INSTRUMENT AND CURRENT MEASURING INSTRUMENT USING SIGNAL PROCESSOR

Document Type and Number:

Japanese Patent JP2005214932

Kind Code:

A

Abstract:

To provide a signal processor capable of obtaining a reliable effective value of an alternating current signal by a relatively simple signal processing circuit.

This signal processor 1 comprises an A/D conversion circuit 2 for converting an analogue alternating current signal into a digital alternating current signal, a square computing circuit 3 for computing a square value of a level value based on the digital alternating current signal output from the A/D conversion circuit 2 to generate a digital signal expressing the square value, a digital filter 4 for extracting a signal of a direct current component out of the digital signal output from the square computing circuit 3, and a square root computing circuit 5 for computing square root of the level value of the digital signal, using the digital signal output from the digital filter 4 to generate a digital signal indicating a square root value therein.

Inventors:

TANAKA RYOHEI
KITANO TOYOKAZU

Application Number:

JP2004025653A

Publication Date:

August 11, 2005

Filing Date:

February 02, 2004

Export Citation:

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Assignee:

DAIHEN CORP

International Classes:

G01R19/02; G06G7/02; G01R19/00; (IPC1-7): G01R19/02

Domestic Patent References:

JPH10232250A	1998-09-02
JPH10319056A	1998-12-04
JPH0395469A	1991-04-19
JPS63163282A	1988-07-06
JP2003179465A	2003-06-27
JPH03151709A	1991-06-27

Attorney, Agent or Firm:

Minoru Yoshida
Tatsuya Tanaka
Tsukasa Senba
Takashi Shiotani
Hiroshi Furusawa
Masato Tsutsui

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