关键词: 声全息, 共轭汇聚波, 二维傅里叶变换, 数字信号处理器

Abstract:

Aiming at the problem that the traditional noise source identification can not make full use of the information of the sound field and inconvenient to achieve. This article put forward a new algorithm grounded on the Acoustic Holography method based on the principle of convergence of conjugated wave. The algorithm exploits 2-dimensional Fast Fourier Transformation （2D FFT） to calculate the complex surface integral thus improves the efficiency of calculation greatly. Based on this new algorithm with huge data and complex operations, the ultra high-speed floating-point DSP chip TMS320C6701 produced by TI Company is selected. Mixed by C and Assembly Language, application of acoustic holography algorithm on DSP can be realized. It is more accurate to identify the location of the noise source through the experiment and it shows the system has the features of high precision, high speed and strong practicability.

Key words: acoustic holography, convergence of conjugated wave, 2D FFT, DSP