声学试验三分之一倍频程控制技术研究

以往的声学试验中多采用倍频程控制方法,该方法控制精度比较低,已不能满足现在试验标准要求。文章详细介绍了声学试验控制系统的基本原理及组成,并对控制算法进行了探讨和研究,通过改进谱估计算法和均衡算法等提高系统的控制精度和稳定性,并采用VC 编程开发了1/3倍频程噪声试验控制系统。新控制系统与混响室进行了联合调试,调试结果表明新控制系统的控制精度满足相关标准的要求。

Research on 1/3 octave acoustic test control technique

In the past, OCT control method was usually used in acoustic tests, but its control precision is low and can not meet the demands of the new test criteria. This paper discusses the principles and the main components of an acoustic test control system especially its control algorithms. By modifying the power spectrum estimation algorithm and the equalization algorithm, the precision and stability of the system can be improved. 1/3 octave acoustic test control system is built in the VC environment. The new control system was tested in a reverberation chamber and the results indicate that the control precision can satisfy related requirements of standards.