Title:
ULTRASONIC MEASURING APPARATUS
Document Type and Number:
Japanese Patent JP3920194
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To improve compression performance by separating reception signals into respective basic waves and taking correlation for the each basic wave.
SOLUTION: When a synthesized wave of a plurality of basic waves s1(t), s2(t) is transmitted, and a reflected wave r(t) of the transmitted ultrasonic wave is received, the received reflected wave r(t) is converted into a representation R(ω) in a frequency domain by Fourier transformation 210. Reflected waves R1(ω), R1(ω) for the basic waves of the frequency representation are acquired by dividing the reflected wave R(ω) as the frequency domain representation by H1(ω), H2(ω) obtained from a spectral ratio in the frequency domain between different basic waves. After the reflected waves r1(t), r2(t) of the basic waves are obtained from the reflected waves R1(ω), R1(ω) corresponding to the basic waves of the frequency representation by inverse Fourier transformation 232, 234, compressed reception signals w1(t), w2(t) are acquired from the reflected waves r1(t), r2(t) of the basic waves by correlation 242, 244 with the basic waves.
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Inventors:
Norio Tagawa
Tadashi Moriya
Tadashi Moriya
Application Number:
JP2002316171A
Publication Date:
May 30, 2007
Filing Date:
October 30, 2002
Export Citation:
Assignee:
Japan Science and Technology Agency
International Classes:
A61B8/00; G01B17/00; G01N29/22; G01N29/44; G01S15/32; G01S15/89; (IPC1-7): A61B8/00; G01B17/00; G01N29/22; G01S15/32; //G01S15/89
Domestic Patent References:
| JP2002136522A | ||||
| JP2001128971A | ||||
| JP9187457A | ||||
| JP3162837A | ||||
| JP2000206227A | ||||
| JP2268283A |
Attorney, Agent or Firm:
Susumu Kako
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