刚完成的基于DE2-70FPGA开发板的音频处理程序，研究了3天，好不容易完成的。使用WM8731芯片实现AD采集，然后通过DA输出到line out.-Recently completed development board based on DE2-70FPGA audio processing procedures of the three days, finally completed. AD using the WM8731 chip collection, and then DA o