基于嵌入式结构的音频数据采集系统设计及实现

Design and Implementation of the Audio Data Acquisition System Based on the Embedded Structure

介绍了基于dsPIC30F6014A嵌入式芯片的高速音频数据采集系统设计方法,研究了针对微弱音频信号调理电路的设计,抑制环境噪声尤其是50Hz电网强信号对弱信号的影响及解决方案.在MATLAB平台上设计了抑制干扰的带通滤波器,自行设计了以dsPIC30F6014A嵌入式芯片为控制器的测试板,并完成了软硬件编程调试.现场测试表明,该系统在环境噪声不超过40db的条件下,对微弱音频信号的采集处理取得了良好的效果.

A high-speed audio data acquisition system based on dsPIC30F6014A is described,the weak audio signal conditioning circuit and the suppression of environmental noise are also researched,especially the affection and solutions of strong signal in 50Hz power system to the weak signal.A band-pass filter is designed to suppress the interference on the MATLAB platform.DsPIC30F6014A embedded chip controller board is designed,meanwhile the hardware and software program and debug are completed.Field tests show that under the condition of the environmental noise does not exceed 40db,good results of the weak audio signal acquisition and process are achieved.