摘要
啸叫现象会严重影响扩声系统性能。采用自适应滤波算法辨识反馈路径的方式进行啸叫抑制,将成比例系数的无延时多带结构子带自适应滤波(Proportionate Delayless Multiband-structured Subband Adaptive Filtering,PDMSAF)算法应用到啸叫抑制系统中。该算法继承了子带自适应滤波算法收敛速度快的优点,并考虑到反馈路径的稀疏特性和系统对实时性的要求,采用成比例系数的步长控制和无延时的误差计算方法。仿真结果表明,当扩声系统的反馈路径具有稀疏特性时,PDMSAF算法可以加快自适应滤波的收敛和跟踪速度。
The performance of microphone-amplifier-loudspeaker systems often suffers from acoustic feedback problem. In this survey paper, we aim to use adaptive filter to identify the feedback path, by deriving the Proportionate Delayless Multi- band-structured Subband Adaptive Filtering algorithm （PDMSAF for short） in the feedback cancellation system, This meth- od inherits the benefit of the subband adaptive filtering method for fast convergence. Considering the sparse feedback path and the requirement for delayless system, we choose a proportionate step-size control and a delayless system realization. The simulation results shows that the PDMSAF algorithm shows better performance in converge speed and tracking speed with sparse feedback path.
出处
《电声技术》
2017年第4期103-106,共4页
Audio Engineering
关键词
扩声系统
啸叫抑制
子带自适应滤波
成比例系数的自适应滤波
microphone-amplifier-loudspeaker systems
feedback cancellation
sub-band adaptive filtering
proportionateadaptive filtering
