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    • 18. 发明专利
    • Sound adsorption coefficient measuring device, sound characteristics measuring device, method and program
    • 声音吸收系数测量装置,声音特性测量装置,方法和程序
    • JP2012052987A
    • 2012-03-15
    • JP2010197503
    • 2010-09-03
    • Takenaka Komuten Co Ltd株式会社竹中工務店
    • KOYANAGI SHINICHIROHIDAKA TAKAYUKI
    • G01H17/00G01H15/00
    • G01N29/46G01H15/00G01N29/09G01N29/11G01N2291/018G01N2291/2634
    • PROBLEM TO BE SOLVED: To measure a sound absorption coefficient over a wide frequency band by one measurement without deteriorating an accuracy.SOLUTION: The sound absorption coefficient measuring device 10 excites a sound field in a tube from a sound source of a speaker 50 by supply of a sound signal from a sound source supply section 34. A sound pressure acquiring section 32 acquires sound pressures at two points of a measurement point A and a measurement B when exciting the sound field. A correlation relationship operating section 26 obtains a correlation function C(τ) related to the time between the two points of the measurement point A and the measurement B using the history of the acquired sound pressures. A wave packet extracting section 28 extracts a first wave packet and a second wave packet, in an order counted from the smaller delay time (time lag) τ, from the correlation function C(τ). A sound absorption operating section 30 obtains a sound pressure reflectance using the first wave packet and the second wave packet, and then obtains a sound absorption coefficient α using the sound pressure reflectance.
    • 要解决的问题:通过一次测量来测量宽频带上的吸声系数而不会降低精度。 解决方案:吸声系数测量装置10通过从声源供应部分34提供声音信号,从扬声器50的声源激发管中的声场。声压获取部分32获取声压 在测量点A的两点和激发声场时的测量B。 相关关系运算部分26使用与测量点A的两点之间的时间和测量B相关的相关函数C A,B 获得的声压。 波分组提取部28从相关函数C A,B“中以从较小的延迟时间(时滞)τ计数的次序提取第一波包和第二波包, SB>(τ)。 吸音操作部分30使用第一波包和第二波包获得声压反射率,然后使用声压反射率获得吸声系数α。 版权所有(C)2012,JPO&INPIT