Title:
SOUND WAVE MEASUREMENT ANALYZER AND SOUND WAVE MEASUREMENT ANALYSIS PROGRAM
Document Type and Number:
Japanese Patent JP3895567
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To obtain a proper directional characteristic even in the case that sound can not be thought a plane wave.
SOLUTION: A sound measurement analyzer gains directivity by overlapping the output of each microphone of a microphone array 12 arranged with a plurality of microphones approximately in linear. The analyzer has a BPF 22 filtering each of microphone outputs with a filter having a specific characteristic containing central frequency to be obtained, a correction processing part 24 correcting the amplitude and the phase of the filtered output based on relative position to the sound source of each microphone under the assumption that incident sound on microphones 14 is a spherical wave by considering the sound source to be a monopole point sound source having no directivity, and a waveform production part 26 obtaining an overlapped waveform.
Inventors:
Katsushi Manabe
Katsuhiro Kikuchi
Yasuo Yoshida
Yasuyuki Tanaka
Katsuhiro Kikuchi
Yasuo Yoshida
Yasuyuki Tanaka
Application Number:
JP2001264233A
Publication Date:
March 22, 2007
Filing Date:
August 31, 2001
Export Citation:
Assignee:
Railway Technical Research Institute
International Classes:
G01H3/00; H04R1/40; (IPC1-7): G01H3/00; H04R1/40
Domestic Patent References:
| JP11018198A | ||||
| JP5091588A | ||||
| JP4324324A | ||||
| JP60125578A |
Attorney, Agent or Firm:
Satoshi Yoshida
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