摘要
本文在分析双传声器──传递函数测量技术缺陷的基础上，提出了伪随机信号的三点测量技术。该技术很好地解决了双传声器──传递函数技术存在的两传声器间距不能为半波长整数倍的问题；采用伪随机信号解决了声场不一致问题以及采用单通道测量避免了双通道测量的不匹配问题。该技术在传统的驻波管中具有实际应用价值。
By analyzing disadvantages of the two-microphone transfer function technique,the three-microphone- position method using a pseudorandom signal is presented in this paper for measuring acoustic properties in the impedance tube. The problem due to the distance between the two microphones being not an integer multiple of the half-wavelength of sound in the two-microphone-transfer function technique can thus be solved in our new method. By using a pseudorandom signal as the noise source,the same sound field is set up for a broadband analysis and the mismatch of the amplitude or phase responses in two-channel measurement is avoided by using single channel only,This method is praticable in the traditional standing wave tube measurement.
出处
《声学技术》
CSCD
1995年第4期158-161,共4页
Technical Acoustics
基金
国家自然科学基金资助
