基于最小相位系统分解的扬声器频响均衡

Equalization of Loudspeaker Frequency Response Based on Minimum Phase System Decomposition

由于扬声器单元存在固有的非线性失真特性,所以其频率响应曲线包含很多峰谷。为了消除这种影响并获得无损音质的扬声器特性,需要将扬声器频率响应曲线的幅度谱补偿为一条平直的曲线。为此,本文设计了一种扬声器非线性均衡方法。该方法首先在消声室测量扬声器的脉冲响应,然后基于对脉冲响应的频域分析,对扬声器频响采取最小相位系统分解后逆滤波的方法对其进行补偿,实验结果显示,均衡后的扬声器系统输出的幅频响应平坦。

In order to obtain the speaker characteristics of lossless sound quality,the amplitude spectrum of its frequency response is required to be a straight curve.Nevertheless,the speaker units have inherent nonlinear distortion characteristics,as a result,the frequency response curve contains many peaks and valleys.To overcome this bad effect,the impulse response of the loudspeaker is measured in an anechoic chamber.Then,based on the frequency domain analysis of the impulse response and the minimum phase decomposition of the system’s frequency response,the frequency response curve is compensated by inverse filtering method.At the end,the simulation results show the frequency response curve of the compensation filter and the error parameter is obtained.