波数域循环加窗逼近法滤波方法研究

摘要

The disadvantages of K⁃space filtering of in the process of the PNAH(plane near⁃field acoustic holography)re⁃verse reconstruction are analyzed. A new method of cyclically windowing and filtering to approximate the true value on the K⁃space NAH is proposed. It solved the limitation that the fixed cutoff frequency and steep coefficient cannot adapt to all the re⁃quirements of K⁃space filtering. By the dual sound source simulation,the filtering results of different K⁃space windowing filte⁃ring are contrasted to verify the effectiveness of the method in positioning the acoustic noise sources and reappearing the acous⁃tics information.%对平面近场声全息逆向重建过程中波数域滤波的弊端做了充分分析，提出一种波数域循环加窗逼近滤波的新方法，解决了固定的截止频率和陡峭系数不能适应全部波数域滤波要求的局限性问题。通过双声源仿真计算，对比波数域加不同窗滤波后的滤波效果，验证了该方法在噪声源的定位和声学信息重现上的有效性。