摘要
为解决传统类音频放大器效率低的缺点，本设计采用TPA3112D1芯片进行音频信号放大，采用超低功耗单片机MSP430F169进行系统控制。系统主要由信号采集、功率放大、啸叫检测及抑制、显示等模块电路组成。系统使用单片机调节功放电路的增益，使用二阶低通和高通有源滤波器检测、过滤和消除啸叫，使用LCD显示程控增益以及输入阻抗等参数。系统增益在50mW～5W功率范围内可调，并且输出波形不失真，啸叫得到有效地检测和抑制。系统操作简单，稳定性好，抗干扰能力强。
In order to solve the problems of low efficiency of traditional audio amplifier, the design used TPA3112D1 to amplify the audio signal, at the same time, we used MSP430F169 which has the advantage of ultra-low power consumption to control the system. The system mainly consists of signal acquisition, power amplification, howling detection and suppression, display module circuit. Microcontroller was used to adjust the gain of the amplifier circuit, and the Second Order low pass and high pass active filter were used to detect, filter and eliminate the whistle, the LCD was used to display programmable gain and input impedance parameters. The system gain is adjustable in the power range from 50 mW to 5W, and the output waveform has no distortion, howling is effectively detected and suppressed. The system operation is simple, the stability is good, and the anti-interference ability is strong.
出处
《现代科学仪器》
2016年第4期43-46,共4页
Modern Scientific Instruments
基金
1.基于DASH传输的HEVC流媒体应用系统（2014FZ0037）,四川省科技厅项目2.基于嵌入式CPU的H.265编解码器的设计及关键技术研究（2015FZ0111）,四川省科技厅项目.
