IFM DEVICE - MITSUBISHI ELECTRIC CORP

Title:

IFM DEVICE

Document Type and Number:

Japanese Patent JP2007304060

Kind Code:

A

Abstract:

To obtain an IFM device capable of instantaneously detecting effective frequency.

A frequency calculation circuit 4 sends out frequency data q1 of an input signal a, based on phase detection videos b1, b2 and outputs phase detection video amplitude signals d, corresponding to the amplitudes of the phase detection videos b1, b2. A leading edge detection circuit 5 outputs a strobe signal e when the phase detection video amplitude signal d exceeds a predetermined threshold and continues for a predetermined time. A frequency data effectiveness determining circuit 6 outputs the frequency data q1 as effective frequency data q2 of the input signal a, when the strobe signal e is output from the leading edge detection circuit 5.

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Inventors:

KANEKAWA YOSUKE

Application Number:

JP2006135432A

Publication Date:

November 22, 2007

Filing Date:

May 15, 2006

Export Citation:

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Assignee:

MITSUBISHI ELECTRIC CORP

International Classes:

G01R23/12

Attorney, Agent or Firm:

Hideaki Tazawa
Konobu Kato
Hamada Hatsune

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