基于Volterra滤波器的参量阵扬声器互调失真补偿研究

针对单边带调制方法预处理的参量阵扬声器系统在复杂信号输入情况下存在明显互调失真的问题,引入Volterra滤波器模型和简化的一维Volterra滤波器模拟了其互调失真。设计了相应的逆滤波器,并对其抑制系统互调失真的性能进行了实验对比。结果表明,所设计的逆滤波器都能有效降低系统的互调失真,而后者具有较低的计算复杂度。

Reduction intermodulation distortion in parametric loudspeakers based on a Volterra filter

The intermodulation distortion (IMD) exposes seriously in the parametric loudspeaker based on the single side amplitude modulation for the complex input signals. A Volterra filter is introduced to model the IMD in the parametric loudspeaker in this paper. A simplified structure, one dimensional Volterra filter (ODVF), is also introduced. The inverse based on these two filters are designed and tested respectively. The experimental results show that the ODVF-based inverse can effectively reduce the IMD of the nonlinear system as the Volterra filter-based inverse but consumes less computation sources.