兼容音频播放的多通道有源噪声控制系统设计

Design of an active noise control system with audio playback

多通道局部有源噪声控制系统由于输入传感器和输出扬声器的通道数多,且要求能自适应外部环境变化,因而存在系统实现复杂度大等问题。此外,用户在使用如有源头靠等有源噪声控制系统以降低低频噪声时,往往希望利用系统播放次级声源的扬声器同时播放音频,这增加了系统设计和实现的复杂度。文中结合ARM、FPGA以及DSP处理器各自的优缺点,设计了一种兼容音频播放功能的多通道自适应有源噪声控制系统。该系统能够在对采样点进行多通道自适应有源噪声控制的同时,利用播放次级声源的扬声器实现音频播放,并采用回声抵消技术降低音频播放对噪声控制造成的影响。

Due to the increased number of input microphones and that of output loudspeakers,as well as high requirements for capability of environmental adaptability,the multi-channel local active noise control system becomes complicated when implementing in real time.In addition,when users use active noise control systems such as headrests to reduce low-frequency noise,they often use the loudspeakers that produce the secondary sound source of the system to play audio signals,which further increases the complexity of the system design and implementation.After considering both the advantages and shortc-omings of ARM,FPGA and DSP processors,this paper designs a novel multi-channel adaptive active noise control system,which can play audio signals and control the environmental noise simultaneously.The proposed system can carry out multi-channel adaptive active noise control sample-by-sample,and use the loudspeakers that produce secondary sound sources to play audio signals at the same time.By introducing an echo cancellation module,we can reduce the impact of playing audio on active noise control.