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1. 发明专利

JP2004301815A Method of measuring pipe diameter using acoustic sensor 审中-公开
公开(公告)号：JP2004301815A
公开(公告)日：2004-10-28
申请号：JP2003127532
申请日：2003-03-31
申请人： Nittobo Acoustic Engineering Co Ltd , Osaka Gas Co Ltd , Seibu Gas Co Ltd , Sumitomo Metal Ind Ltd , Toho Gas Co Ltd , Tokyo Gas Co Ltd , 住友金属工業株式会社 , 大阪瓦斯株式会社 , 日東紡音響エンジニアリング株式会社 , 東京瓦斯株式会社 , 東邦瓦斯株式会社 , 西部瓦斯株式会社
发明人： NAKAJIMA HIROSHI , YAMANAKA TAKAAKI , OYAMA HIROSHI , OOHASHI SHINJI , HOSHINO IKUJI , YAGI SHUICHI , KAWAGUCHI KEIJI , KOSAKA MASAMICHI , TOYODA YASUHIRO
IPC分类号： G01B17/00
摘要： PROBLEM TO BE SOLVED: To easily and exactly measure a pipe diameter, using an acoustic sensor. SOLUTION: An electric acoustic converter for an output and an electric acoustic converter for an input are arranged in a pipe, a sound wave having a fixed energy and/or power level(s) is output from the electric acoustic converter for the output to input the output sound wave into the electric acoustic converter for the input, and the pipe diameter is found by collating a value/values of energy and/or power level(s) of the input sound wave, a value of time constitution of an impulse response shape, values of the whole band level of a frequency transmission characteristic, a specified band level thereof and a specified frequency-weighed level therein, or a value/values of a peak and/or dip frequency/frequencies of the frequency transmission characteristic with a value found preliminarily. COPYRIGHT: (C)2005,JPO&NCIPI

2. 发明专利

JP2004085515A Method of detecting shape of pipeline using impulse response 审中-公开
公开(公告)号：JP2004085515A
公开(公告)日：2004-03-18
申请号：JP2002289236
申请日：2002-08-27
申请人： Nittobo Acoustic Engineering Co Ltd , 日東紡音響エンジニアリング株式会社
发明人： NAKAJIMA HIROSHI , OOHASHI SHINJI , TSURU HIDEO , OYAMA HIROSHI , YAMANAKA TAKAAKI
IPC分类号： G01B17/00 , G01B17/06
摘要： PROBLEM TO BE SOLVED: To solve the problem that skillfulness and long-time work are required at the time of moving a mobile camera in an easily visible direction or to a position and, when the shape of a pipeline is detected by using the reflected sound of an impulse response of the pipeline, the sound is attenuated and produces accents as the sound goes to the deep portion of the pipeline and the detection of each portion of the pipeline becomes difficult due to the attenuation and the type of the portion is not discriminated due to the accents, because each portion is detected from the impulse response of the pipeline itself. SOLUTION: In this method, a sound wave is inputted to the pipeline composed of a straight portion, and a special shape portion from one side and the length and shape of the pipeline from the side to the other side are detected by receiving reflected sound waves from the special shape portion. In addition, the shape detection of the pipeline comprises a step of modeling the straight and special shape portions of the pipeline by receiving the reflected waves as the impulse response of the pipeline, a step of calculating the impulse response of each portion by estimating the impulse response of the pipeline by calculating the modeled straight and special shape portions of the pipeline, and a step of successively detecting the shape of the pipeline from one side by comparing the impulse response of each portion with the impulse response of the pipeline from which the reflected sound waves are received. COPYRIGHT: (C)2004,JPO

3. 发明专利

JP2004279390A Beam forming by microphone using indefinite term 有权
公开(公告)号：JP2004279390A
公开(公告)日：2004-10-07
申请号：JP2003114976
申请日：2003-03-17
申请人： Nittobo Acoustic Engineering Co Ltd , 日東紡音響エンジニアリング株式会社
发明人： NAKAJIMA HIROSHI , YAMANAKA TAKAAKI , NAKAGAWA HIROSHI
IPC分类号： H04R1/40 , G01S3/808 , G01S7/523 , H04R3/00
摘要： PROBLEM TO BE SOLVED: To solve the problems that delay sum BF (beam forming) generates a wide beam which does not ensure its peak direction and makes a side lobe large, when a spherical or an unequally-spaced array is used, and weighted delay sum BF generates a wide beam making the side lobe large, and in BF having NULL control can make zero at only the number of points less 1 and make the side lobe large at positions between the points set to zero, and furthermore, LSE-controlled BF makes the height of main beam small and ensure neither the gain in target direction nor peak position.
SOLUTION: A BF way which carries out compositions through the output signals from a plurality of microphones disposed at arbitrary space points, adopts an indefinite term LSE-controlled BF and an indefinite term LSE-controlled BF with peak fixing, thereby eliminating the need to adjust parameters and at the same time, designing a filter optimized for the side lobe in the sense of squared error.
COPYRIGHT: (C)2005,JPO&NCIPI

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