The mean square root preprocessing method of acoustic parametric array can control harmonic distortion in direc⁃tional sound system and restore the audio quality. The multi⁃rate signal processing method is adopted in this paper to conduct mean square root preprocessing of audio signal. FPGA was realized in the development board Xilinx SPARTAN3. The results show that the method can provide a choice for acoustic parametric array processing system which is less affected by harmonic dis⁃tortion.% 均方根预处理声学参量阵方法在定向声音发生系统中控制谐波失真效果较好，还原音频音质优良。采用多速率信号处理的方式对音频信号进行均方根预处理调制，并在Xilinx SPARTAN3开发板上完成FPGA的实现。结果表明，此方法可为对谐波失真影响较小的声参量阵信号处理系统提供选择。
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