串音消除系统中的自适应级联逆滤波器设计

为了简化声音重发系统中的串音消除模块结构,提出了级联形式的逆滤波器设计方案.通过分析不同通道扬声器传递函数的时频响应,提取出共用的逆滤波器用于均衡扬声器传递函数的共同部分,同时推导了级联结构的参数自适应调节算法.通过减少重复求逆计算,提高各通道逆滤波器的效率.在相同参数量情况下,级联结构的平均信道分离度比直接结构最多可以下降6dB,串音消除性能更优.计算机仿真与实际环境测试结果都表明该方案有效减少了参数,简化了滤波器结构,取得比较满意的效果.

Adaptive cascade inverse filter design for crosstalk cancellation system

To simplify the crosstalk cancellation block in sound rendering systems,the scheme of cascade inverse filter is proposed.By analyzing the impulse response and the frequency response of the loudspeaker transfer functions of different channels,a common inverse filter is designed to compensate the similar part of the loudspeaker transfer functions.Based on this,a corresponding adaptive algorithm for cascade structure is deduced.By reduction of inverse operation,the efficiency of the filter in each channel is improved.With the same amount of the coefficients,the proposed cascade structure has extended the average channel separation at best about 6 dB comparing with the conventional structure,thus has a more satisfactory performance.Computer simulation and experimental tests in real environment show that the proposed scheme effectively reduces the filter parameters with acceptable performance for crosstalk cancellation.