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PEAK FREQUENCY MEASUREMENT SYSTEM FOR SUBJECT-STATE ANALYZING SIGNAL

Foreign code F120006507
File No. QP090181-PC,S2011-1160-N0
Posted date May 7, 2012
Country WIPO
International application number 2011JP053028
International publication number WO 2011/099600
Date of international filing Feb 14, 2011
Date of international publication Aug 18, 2011
Priority data
  • P2010-030225 (Feb 15, 2010) JP
Title PEAK FREQUENCY MEASUREMENT SYSTEM FOR SUBJECT-STATE ANALYZING SIGNAL
Abstract A signal peak frequency measurement system which applies a maximum entropy method to the signal generated by the transmission/reception of an electromagnetic wave to/from a subject to find the frequency of a peak component to be measured, whereby desired information can be acquired with avoiding the effect of noise to properly evaluate the state of the subject. A signal analyzing means (12) executes, from a phase difference signal including noise other than the peak component to be measured, which is obtained by an electromagnetic wave transmission/reception means (11), spectrum estimation to which the maximum entropy method is applied with a signal portion having a predetermined short analysis duration of the phase difference signal as an object, finds a frequency representing the occurrence frequency of the peak component, and further repeats the same processing while moving analysis duration's worth of positions to be analyzed on the time axis of the phase difference signal, wherein, as a result of continuously conducting the frequency, the transition over the time of the frequency of the peak component can be grasped to derive the state of changes in the peak component to be measured in the phase difference signal in a short time for proper evaluation.
  • Applicant
  • ※All designated countries except for US in the data before July 2012
  • Kyushu University, National University Corporation
  • Inventor
  • MASE Atsushi
  • NAGAE Daisuke
IPC(International Patent Classification)
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