US 2011/0218742 A1Published application

Calculating device and flow meter equipped with calculating device

AssigneeYamatake Corporation

InventorHiroshi Sasaki

Life of this patent

Estimating the term…

Loading patent…

Abstract

The calculating device has first and second Fourier transform portions performing Fourier transforms on two respective inputted signals; a complex conjugate deriving portion deriving a complex conjugate of a value outputted from the first Fourier transform portion; a multiplier multiplying the complex conjugate with the value outputted from the second Fourier transform portion, and outputting the value after the multiplication; a Hilbert transform portion performing a Hilbert transform on the value after multiplication; first and second inverse Fourier transform portions performing respective inverse Fourier transforms on the value after multiplication and the value outputted from the Hilbert transform portion; a phase relationship deriving portion deriving a phase relationship between the two inputted signals based on the values outputted from the first and second inverse Fourier transform portions; and a time difference deriving portion deriving a time difference between the two inputted signals based on the phase relationship.

Claims4

Dependent claims

A calculating device comprising:

a first Fourier transform portion performing a Fourier transform on a first inputted signal;
a second Fourier transform portion performing a Fourier transform on a second inputted signal;
a complex conjugate deriving portion deriving a complex conjugate of the value outputted from the first Fourier transform portion;
a multiplier multiplying the complex conjugate by the value outputted from the second Fourier transform portion, and for outputting the value after the multiplication;
a Hilbert transform portion performing a Hilbert transform on the value after the multiplication;
a first inverse Fourier transform portion performing an inverse Fourier transform on the value after multiplication;
a second inverse Fourier transform portion performing an inverse Fourier transform on the value outputted from the first inverse Fourier transform portion;
a phase relationship deriving portion deriving a phase relationship between the first inputted signal and the second inputted signal based on the value outputted from the first inverse Fourier transform portion and the value outputted from the second inverse Fourier transform portion;
and a time difference deriving portion deriving the time difference between the first inputted signal and the second inputted signal based on the phase relationship.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/943,276Filed 10 Nov 2010
Priority: JP 2010-0466823 Mar 2010
Published: 8 Sep 2011
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

G01F 1/00
Measuring the volume flow or mass flow of fluid or fluent solid
G01F 1/66
Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow: by…
G01F 1/667
By measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters: arrangements of…
G16Z 99/00
Subject matter not provided for in other main groups of this subclass