摘要
采用ARM处理器STM32F103作为控制核心,以TI公司的TPA3112D1构成的D类音频放大器作为功放电路的核心,具有能量转换效率高的特点。它的重点和难点在于啸叫的实时检测和深度抑制,以及根据啸叫信号的重复性找出啸叫频率。啸叫抑制可以采用最小均方自适应滤波器(Least Mean Square,LMS)的陷波法。该方法能够根据啸叫频率,实时更改滤波中心频率,并使其具备高Q值。
Using ARM processor STM32 F103 as the control core and class D audio amplifier composed of tpa3112 d1 of TI company as the core of power amplifier circuit, it has the characteristics of high energy conversion efficiency. The key and difficult points are the real-time detection and depth suppression of howling, and finding out the howling frequency according to the repeatability of howling signal. The notch method of least mean square adaptive filter(LMS) can be used for squealing suppression.This method can change the filter center frequency in real time according to the squealing frequency and make it have high Q value.
作者
杨川
张小波
牟琪琦
周维川
YANG Chuan;ZHANG Xiaobo;MOU Qiqi;ZHOU Weichuan(Chongqing Electromechanical Vocational and Technical University,Chongqing 402760)
出处
《现代制造技术与装备》
2021年第11期16-19,共4页
Modern Manufacturing Technology and Equipment
基金
重庆市教委科学技术研究项目(KJQN202003701)
重庆智能制造职教集团2020年度重点项目(CQZNZJ202001-ZC)。
