基于压缩感知理论的音频采样及无线传输系统

Audio Sampling and Wireless Transmission System Based on Compressed Sensing

基于压缩感知理论,以STM32F103单片机为主控核心,设计了一种能够以远低于奈奎斯特采样率进行声信号采样的系统,本系统大大降低了对硬件存储容量和采样速率的要求,同时减轻了无线传输的负担。利用压缩采样技术得到音频信号的有效信息,通过nRF24L01无线传输模块和串口将有效信息实时传输至上位机终端进行重构和分析。实验结果表明,该系统重构效果良好,并具有低功耗和高效率的特点,适用于需要长时间声音监测的场合。

Based on the theory of compressed sensing,the STM32F103 single-chip microcomputer is used as the core of the control,and a system capable of sampling the acoustic signal far below the Nyquist sampling rate is designed,which greatly reduces the requirements on hardware storage capacity and sampling rate.At the same time,the burden of wireless transmission is reduced.The compressed sampling technology is used to obtain the effective information of the audio signal,and the effective information is transmitted to the host computer terminal for reconstruction and analysis in real time through the nRF24L01 wireless transmission module and the serial port.The experimental results show that the system has good reconstruction effect and low power consumption and high efficiency.It is suitable for occasions requiring long-term sound monitoring.