采用伪随机信号激励的驻波管三点测量法

Three-point method for measurement in a impedance tube using pseudorandom signal excitation

摘要: 本文对伪随机信号激励的驻波管三点测量法(TPM)进行了讨论和误差分析,并与驻波比法(SWR)及双传声器传递函数法(TTF)进行了比较。结果表明,伪随机信号三点法具有较高的精度,与驻波比法所得结果吻合甚好,并很好地解决了双传声器传递函数法存在的缺陷,可用于实际测量。

Abstract: A new method measuring acoustical propertiest-Threde-Point method using pseudorandom excitation is discussed in this paper and its error is analysed in detail.Experiments have been done to compare the Three-Point method with SWR method and TTF method.It is shown that the results of the new method are in good agreement with SWR,and the shortcomings of TTF are overcome.