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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.
This paper introduces the design method of high-speed audio data acquisition system based on dsPIC30F6014A embedded chip, and studies the design of the weak audio signal conditioning circuit and the influence of the strong noise of the 50Hz power network on the weak signal and its solution. The interference suppression band-pass filter, dsPIC30F6014A embedded chip designed for the controller test board, and completed the hardware and software programming debugging.On the field tests show that the system under the conditions of environmental noise does not exceed 40db, weak Audio signal acquisition and processing achieved good results.