Title:
SINGLE-FREQUENCY SIGNAL DETECTION DEVICE, SINGLE-FREQUENCY DETECTION METHOD, PHASE SHIFT DETECTION DEVICE, AND PHASE SHIFT DETECTION METHOD
Document Type and Number:
Japanese Patent JP2020115096
Kind Code:
A
Abstract:
To enable only one detection circuit to not only detect whether an input signal is a single frequency signal but also to detect a frequency.SOLUTION: A single frequency signal detection method comprises: generating a prediction signal of an input discrete signal on the basis of a first signal obtained by multiplying a coefficient and a first discrete signal immediately before the input discrete signal among two consecutive past discrete signals preceding the input discrete signal, as well as on the basis of a second signal obtained by multiplying a constant and a second discrete signal immediately before the first discrete signal; taking a difference between the input discrete signal and the prediction signal; generating a prediction residual signal; updating a coefficient as an adaptive filter coefficient, using the prediction residual signal; determining that the input signal is a single frequency signal upon convergence of the coefficient; and obtaining a frequency on the basis of the coefficient.SELECTED DRAWING: Figure 1
Inventors:
KIHARA KOICHI
ISHIGURO TAKASHI
AKIE KAZUYOSHI
HIRANO MASAKI
ARIYAMA YOSHIHIRO
ISHIGURO TAKASHI
AKIE KAZUYOSHI
HIRANO MASAKI
ARIYAMA YOSHIHIRO
Application Number:
JP2019006344A
Publication Date:
July 30, 2020
Filing Date:
January 17, 2019
Export Citation:
Assignee:
OKI ELECTRIC IND CO LTD
International Classes:
G01R23/10; G01R23/167
Domestic Patent References:
| JPH09307402A | 1997-11-28 | |||
| JP2018054417A | 2018-04-05 |
Foreign References:
| US10148274B1 | 2018-12-04 |
Attorney, Agent or Firm:
Yoshida Rintaro
Yusuke Wakabayashi
Yusuke Wakabayashi