Title:
位相差算出方法
Document Type and Number:
Japanese Patent JP5022545
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To calculate the phase difference between two signal waveforms under test having the same period, even with waveform distortions, without using the FFT operation. SOLUTION: For arithmetically obtaining the phase difference between at least two signal waveforms under test, having the same period, A/D converted values of one signal waveform for one period and those of the other signal waveform for one period are AND-operated over the same time period to obtain a first integrated value P, A/D converted values of one signal waveform for one period portion and those of the other signal waveform for the one period portion shifted by ±1/4 ±N periods (N: integer) from the one period thereof are AND-operated to obtain a second integrated value Q, and an arctangent value arctan (Q/P) is obtained from the first and second integrated values P, Q.
Inventors:
Toshiaki Tanaka
Sadataka Miyajima
Sadataka Miyajima
Application Number:
JP2001243586A
Publication Date:
September 12, 2012
Filing Date:
August 10, 2001
Export Citation:
Assignee:
Hioki Electric Co., Ltd.
International Classes:
G01R25/00; G01R31/02
Domestic Patent References:
| JP2001041984A | ||||
| JP7143197A | ||||
| JP2298872A | ||||
| JP200191552A | ||||
| JP7225249A | ||||
| JP1090311A | ||||
| JP9229975A | ||||
| JP569688U | ||||
| JP8145719A | ||||
| JP6176928A |
Attorney, Agent or Firm:
Takuya Ohara