Title:
非定常波解析システム
Document Type and Number:
Japanese Patent JP4354388
Kind Code:
B2
Abstract:
There is provided a non-stationary wave analysis system capable of detecting a change of a non-stationary wave with an increased S/N ratio, eliminating the limit of the time resolution of frequency distribution analysis depending on the wavelength, and performing analysis of a non-stationary wave which can be measured by an object or a biometric signal. The non-stationary analysis system includes: a sensor for converting the non-stationary wave as an analysis object into an electric signal; a frequency disintegrator for subjecting the non-stationary wave converted into the electric signal to a frequency analysis and performing conversion into a signal for each frequency band; a plurality of differentiation calculators for differentiation of a signal for each frequency band outputted from the frequency disintegrator; a plurality of variable resistors for dividing the output signal from the differentiation calculator by a constant; a plurality of first multipliers for squaring signals outputted from the variable resistors; a plurality of second multipliers for squaring a signal for each frequency band outputted from the frequency disintegrator; a plurality of adders for adding the outputs of the both multipliers; a plurality of square root calculators for outputting the square root value of the output of the adders; and an output unit for outputting signals outputted from the square root calculators.
Inventors:
Masato Takita
Takahiro Kawashima
Hiroshi Yokoi
Ryu Kato
Takahiro Kawashima
Hiroshi Yokoi
Ryu Kato
Application Number:
JP2004339514A
Publication Date:
October 28, 2009
Filing Date:
November 24, 2004
Export Citation:
Assignee:
National Institute of Advanced Industrial Science and Technology
International Classes:
G01D1/10; G01H17/00; G01R23/16; G06K9/00
Domestic Patent References:
| JP2001224564A | ||||
| JP53120488A |