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21. 发明专利

JPH04505372A 失效
公开(公告)号：JPH04505372A
公开(公告)日：1992-09-17
申请号：JP50798490
申请日：1990-05-17
IPC分类号： G01H3/04 , G01R23/16 , G01R23/165 , G10L21/02 , G10L21/0208 , G10L25/27 , H04R25/00

24. 发明专利

JPH0332073B2 失效
公开(公告)号：JPH0332073B2
公开(公告)日：1991-05-09
申请号：JP24136784
申请日：1984-11-15
申请人： VICTOR COMPANY OF JAPAN
发明人： TANAKA YOSHIAKI
IPC分类号： G10L11/00 , G01H3/04 , G01H3/08 , G09B15/00 , G10G1/00 , G10G3/04 , G10H1/00

27. 发明专利

JPH0219724A ACOUSTIC SPECTRUM MEASURING DEVICE 失效
公开(公告)号：JPH0219724A
公开(公告)日：1990-01-23
申请号：JP16880088
申请日：1988-07-08
申请人： HITACHI DENSHI SERVICE KK
发明人： NAKATANI YOSHIKATSU
IPC分类号： G01H3/04 , G01H17/00
摘要： PURPOSE:To easily extract the characteristic of an acoustic spectrum by considering that the peak value of a measured object exists in an measuring band where Pn/Pw=P1>1 or Pn-Pw=P2>0 and the value of P1 or P2 is a relative peak value when a measured value by a narrow-band filter and a wide-band filter are taken as Pn and Pw. CONSTITUTION:The narrow-band characteristic filter and the wide-band characteristic filter which have an identical center frequency are provided. Then, the acoustic power Pn in the measuring band is picked up with high sensitivity through the narrow-band filter and the acoustic power including the acoustic power out of the measuring band is picked up through the wide-band filter. In such a case, it is considered that environmental noise is comparatively much included in the acoustic power Pw obtained through the wide-band filter. Based on such point of view, the measuring band where the projecting acoustic power is generated can be specified by measuring projecting values every measuring band in letting P1=Pn/Pw1 and P2=Pn-Pw>0 and obtaining the spectrum of P1 or P2.

29. 发明专利

JPS61296265A APPARATUS FOR DISCRIMINATING SOUND SOURCE 失效
公开(公告)号：JPS61296265A
公开(公告)日：1986-12-27
申请号：JP13876485
申请日：1985-06-25
申请人： NF KAIRO SEKKEI BLOCK KK
发明人： HARADA SHUICHI
IPC分类号： G01H3/04 , G01H3/08 , G01H17/00 , G01N29/04 , G01N29/14
摘要： PURPOSE:To attain to enhance discrimination accuracy by discriminating a sound source, by preliminarily registering the frequency pattern of the signal from the sound source and matching this pattern with the frequency pattern from the sound source. CONSTITUTION:The AE signal detected through a transducer 1 receives impedance transformation by a preamplifier to be inputted to band-pass filters BPF51-55 to different frequency pass band through a coaxial cable 3 and a buffer amplifier 4. The AE signal divided into five frequency bands is inputted to a multiplexer 9 through logarithmic amplifiers 61-65 and detectors 71-75. The outputs thereof are inputted to a microcomputer 11 as frequency patterns of signal levels corresponding to five bands at certain time and the distance data between two points of the signal levels of said frequency patterns is calculated. This distance data of the frequency patterns is compared with that corresponding to the preliminarily registered frequency pattern of the signal from a sound source to enable the highly accurate discrimination of the sound source.

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