多采样率双通道有源噪声反馈控制系统的研究  

Multi-Rate Double Channel Feedback Active Noise Control System

作　　者：杨丽民 周邵萍[1] 李锦良 邢改兰[1] YANG Limin;ZHOU Shaoping;LI Jinliang;XING Gailan(Key Laboratory of Pressurized Systems and Safety,Ministry of Education,East China University of Science and Technology,Shanghai 200237,China)

机构地区：[1]华东理工大学承压系统与安全教育部重点实验室,上海200237

出　　处：《华东理工大学学报（自然科学版）》2024年第2期301-309,共9页Journal of East China University of Science and Technology

摘　　要：传统有源噪声控制系统中的音频编解码器只能使用高速率的单一采样率,因此系统中的建模滤波器和自适应滤波器需要的长度较长,而且预留给每次迭代计算的时间很短,这导致了计算量大、难以实现实时在线计算的问题。针对以上困难,首先提出一种多采样率的方法,即采用抽取和插值的方法为有源噪声控制系统提供更低的采样率,从而在减少计算量的同时增加可用于迭代计算的时间,并基于最小均方算法对次级声通道进行建模,推演多采样率双通道反馈有源噪声控制系统模型;其次搭建基于座椅头靠和数字信号处理器的实验平台,对多采样率的双通道有源噪声反馈控制系统的有效性进行实验验证。验证结果表明,针对低频噪声,在相应的频段上本文降噪系统可以达到约15 dB的降噪量,降噪效果明显。The audio codecs in conventional active noise control systems can only use a high-speed single sampling rate,so the modeling filters and adaptive filters in the system require a longer filter length and the time reserved for iterations is very short,which leads to high computational complexity and difficulty in real-time online computation.To address these problems,a multi-sampling rate system is firstly proposed,which uses extraction and interpolation methods to provide lower sampling rates for active noise control system,reducing the computational complexity while increasing the time available for iterative computation.Based on the minimum mean square algorithm,the secondary sound channel is modeled and a multi-sampling rate double-channel feedback active noise control system is modeled too.Finally,an experimental platform based on seat headrest and digital signal processor is built to experimentally verify the effectiveness of the double-channel active noise feedback control system with multisampling rates.The experimental results show that for low frequency noise,the noise reduction system can achieve a noise reduction of about 15 dB in the corresponding frequency band,and the noise reduction is obvious.

关 键 词：有源噪声控制 多采样率 双通道 反馈控制 低频噪声 

分 类 号：TB535[理学—物理]