基于FPGA的心音信号采集系统设计

Phonocardiogram signal acquisition system based on FPGA

介绍了一种基于FPGA的心音信号的采集系统,该系统包括心音信号传感器,心音信号采集电路,带有集成耳机驱动器的低功耗音频编码解码器WM8731芯片.心音传感器将心音信号转换为电信号,传送到心音信号采集板上,进行放大及滤波,再传送到FPGA的WM8731芯片上进行A/D转换,最后通过RS232串口传送的PC机上.该系统设计表明能够满足快速对心音信号进行采集,为后续信号的处理奠定坚实的基础.

This paper introduces a kind of phonocardiogram signal acquisition system based on FPGA. This system includes a phonocardiogram signal sensor and acquisition circuit, and the low- power audio codec WM8731 chip with an integrated headphone driver.Phonocardiogram sensor works by converting the phonocardio- gram signal into electrical signals and transmitting into the signal acquisition board.After amplification and filtra- tion, the signal is further transmitted to WM8731 chip which on FPGA through A/D conversion, and is finally re- ceived by RS232 serial port of PC.This design shows that the system can meet the requirements for rapid collec- tion of phonocardiogram signal,laying solid foundation for the subsequent signal processing.