Calculating device and flow meter equipped with calculating device
US8498828B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 10, 2010 |
| Grant date | Jul 30, 2013 |
| Priority date | — |
| Expiry date | Sep 20, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG16Z99/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.