一种检测多频多源复杂稳定声场声压的新方法

A New Method for Detecting Sound Pressure of Multi-Frequency and Multi-Source in Complex Stable Sound Field

针对准确检测出多频多源声场复声压信号不理想,并且在信噪比(SNR)较低的情况下,现有的检测方法很难解决,提出了一种结合自适应算法、信号互谱和信号能量不变原则检测多频多源复杂稳定声场声压的方法。该方法首先利用自适应算法求出背景随机噪声,再次利用自适应算法求出声源辐射信号,并对频谱分析和校正,结合信号互谱、信号正交,以及信号能量不变原则得出声场中检测点的复声压,最后通过算例验证此方法的有效性和可行性,即使声场在多频多源且信噪比较低的情况下,仍然能精确测出声场测点的复声压信号。

For accurate detecting the complex sound pressure signal of multi-frequency and multi-source sound field is more difficult, and the existing detection methods are difficult to solve the problem in the low Signal to Noise Ratio （SNR）. A complex sound pressure detection method which combining adaptive algorithms, signal cross spectrum signal and energy unchanged principles is proposed. The method is firstly using the adaptive algorithm derived random background noise, re- using adaptive algorithms to calculate the radiation signal based on random background noise, and spectral analysis and correction, then combining adaptive algorithms, signal cross spectrum and signal energy unchanged principles derived complex sound pressure of sound field detection point. Finally simulation examples show the effectiveness and feasibility of this method. In the way, still can accurately detecting the complex sound pressure signal of multi-frequency and multi-source sound field in the low SNR.