摘要
为实现音频功率放大输出无失真信号,以及解决由于输出功率过高、声反馈引起的啸叫,设计一个基于功放芯片TDA7297的音频功率放大器及啸叫检测和抑制系统。系统采用ST公司基于ARM Cortex-M3内核的32位微控制器STM32F103RCT6编程,利用定时器的输入捕获功能测量比较器方波从而计算啸叫频率,通过程序控制MAX262对音频信号进行陷波,从而达到抑制啸叫信号的作用。
An audio power amplifier and howling detection and suppression system based on the power amplifier chip TDA7297 is designed in this paper.The system uses ST's ARM Cortex-M3-based 32-bit microcontroller core STM32F103RCT6 programmed using a timer input capture function measures the comparator to calculate the square wave frequency whistle,program control MAX262 notch audio signal,so as to achieve inhibit signal whistle.
出处
《工业控制计算机》
2019年第2期146-148,共3页
Industrial Control Computer
