Title:
A signal processor, a signal processing method, and a program
Document Type and Number:
Japanese Patent JP6041325
Kind Code:
B2
Abstract:
To improve the stability of numerical calculation for finding a continuous phase of a pair of signal sequences, provided is a signal processing device (10) wherein a spline calculation unit (13) approximates a pair of signal sequences acquired by a signal acquisition unit (11) by spline functions, and an unwrapping processing unit (18) performs phase unwrapping using polynomials. The phase unwrapping is performed according to a procedure where a polynomial-sequence calculation unit (15) calculates a polynomial sequence by applying a Euclidean algorithm to the polynomials of the spline functions, a sign counting unit (17) checks the number of changes of the sign of a numerical sequence formed by arranging the values of the polynomial sequence in each subinterval where the phase is found, and an unwrapping processing unit (18) determines an indefinite portion that is an integral multiple of π on the basis of the number of changes.
Inventors:
Isao Yamada
Kitahara Earth
Kitahara Earth
Application Number:
JP2014511131A
Publication Date:
December 07, 2016
Filing Date:
February 22, 2013
Export Citation:
Assignee:
National University Corporation Tokyo Institute of Technology
International Classes:
G01S13/90; A61B5/055
Domestic Patent References:
| JP2007333583A | ||||
| JP200370763A | ||||
| JP1090112A | ||||
| JP2010252331A | ||||
| JP575476A |
Attorney, Agent or Firm:
Atsushi Aoki
Jun Tsuruta
Tomohiro Minamiyama
Koichi Itsubo
Ryoichi Hagiwara
Jun Tsuruta
Tomohiro Minamiyama
Koichi Itsubo
Ryoichi Hagiwara