面向声品质改善的车内主动噪声控制系统设计

Design of active noise control system in vehicle for sound quality improvement

针对当前车用主动噪声控制系统以声压级为主要控制目标的不足,考虑人耳听觉主观感受,基于FPGA硬件设计平台提出一种面向声品质改善的车内主动噪声控制系统设计方案。首先设计时频数据转换模块、确定声品质控制思路,其次对自适应滤波技术和支持2路参考信号的2×2多通道FELMS算法进行设计,最后利用ZYNQ7000主控芯片及相关外设完成实验平台搭建。试验结果表明,所设计的系统在降噪点处对发动机噪声A计权声压级和总响度均有一定程度的控制效果。

Aiming at the shortcomings of the current vehicle active noise control system with sound pressure level as the main control goal,considering the subjective feeling of human hearing,a set of design scheme of in-vehicle active noise control system for sound quality improvement was explored based on FPGA hardware design platform.Firstly,the time-frequency data conversion module and sound quality control idea were designed,and secondly,the adaptive filtering technology and 2×2 multi-channel FELMS algorithm supporting two reference signals were designed,and then the ZYNQ7000 main control chip and related peripherals were used to complete the construction of the experimental platform.The test results showed that the designed system had a certain degree of control over the A-weighted sound pressure level and total loudness of the engine noise at the noise reduction point.