摘要
针对拾音器与扬声器距离过近声反馈导致的啸叫问题,提出采用基于STM32F407VGT6单片机集成的12位精密AD转换器实现对音频信号采样,设计利用快速傅氏变换和快速傅氏反变换算法进行滤波处理,实现系统的啸叫检测抑制,并通过程控芯片AY-TPA3112D实现功率放大输出。经过仿真分析与实验验证,该系统可以有效抑制5 W扬声器和灵敏度大于-40 d B V/P的拾音器在距离保持4 cm及以上时发生的啸叫。
In order to solve the problem about howling which dues to pickups and speakers too close,a howling suppression design based STM32F407VGT6 with 12 Precision AD converter was proposed,using the Fast Fourier Transform and Fast Fourier Transform Algorithm for filtering. And power through programmable chip AY- TPA3112 D amplified output was achieved. By simulation analysis and experimental verification,the system can effectively inhibit howling between the 5W speaker and- 40 d B V / P pickup.
出处
《西南科技大学学报》
CAS
2015年第2期93-96,100,共5页
Journal of Southwest University of Science and Technology
