根据人耳对声音信号相位不敏感的原理,采用时变全通滤波器,随机化每个声源输入信号的相位,从而减小声源输出信号之间的相关性,进而减小由于相关产生干涉而带来的梳状滤波失真。数值计算和实验结果均表明用时变全通滤波器随机化声源输入信号的相位能够有效地减小扩声系统中的梳状滤波失真。
To eliminate or reduce the poor performance caused by phase interference effects in sound reinforcement system, a time-varying all-pass filter is adopted. Because the time-varying all-pass filter only changes the phase of the input signal, so it has little effect on audile perception. Both numerical simulation and experiment show that the proposed technique can reduce the comb-filter distortion.