便携式四通道肺音采集系统设计

摘要

Firstly,system complete preprocessing including amplification,filtering,etc. of lung sound signal, external A/D sampling is carried out on preprocessed lung sound signal,and the acquired lung sound signals are saved as . WAV audio file stored in SD card,and using short time Fourier transform( STFT)to complete the time-frequency domain analysis on lung sound signals. Through the system,patient ’s lung sound signals can be accurately detected,and using stereo headphones,synchronous auscultation of patient can be realized.%首先完成对肺音信号的放大、滤波等预处理；然后对预处理的肺音信号进行外部A/D采样，并将采集肺音信号保存为。 WAV音频文件存储于SD卡中；利用短时傅立叶变换完成了对肺音信号的时频域分析。通过该系统可以准确地检测到病人的肺音信号，并且利用立体声耳机可以实现对病人的同步听诊。