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

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。

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