Title:
APPARATUS AND METHOD FOR SYNCHRONOUS DETECTION, AND METHOD AND APPARATUS FOR MEASURING MAGNETISM
Document Type and Number:
Japanese Patent JP2007225303
Kind Code:
A
Abstract:
To provide a synchronous detection method and apparatus for performing A/D conversion prior to synchronous detection even in the case that a primary frequency is high and performing synchronous detection at low costs and provide a magnetic measuring method and apparatus.
In the synchronous detection method for converting signals to be detected from analog to digital form and performing synchronous detection by digital signal processing, the sampling frequency on the A/D conversion is set lower than twice the frequency of a reference signal and equal to a maximum frequency of signals after synchronous detection or higher.
COPYRIGHT: (C)2007,JPO&INPIT
Inventors:
KOSHIHARA TAKAHIRO
KATO HIROHARU
KATO HIROHARU
Application Number:
JP2006043659A
Publication Date:
September 06, 2007
Filing Date:
February 21, 2006
Export Citation:
Assignee:
JFE STEEL KK
International Classes:
G01R33/02; G01N27/83
Domestic Patent References:
| JP2005344874A | 2005-12-15 | |||
| JPH0983594A | 1997-03-28 | |||
| JPS5990044A | 1984-05-24 |
Other References:
山本 裕, 永原 正章: "サンプル値制御によるディジタル信号処理(「システム制御理論の新領域特集号」)", システム/制御/情報 : システム制御情報学会誌, vol. 45, no. 4, JPN6010066344, 15 April 2001 (2001-04-15), JP, pages 162 - 167, ISSN: 0001780388
Attorney, Agent or Firm:
Kenichiro Ochiai
Kazuhiro Mori
Kazuhiro Mori
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