The Acquisition and Short Time Fourier Transform of Lung Sounds

The paper designed a portable four-channel lung sounds acquisition system. The system first completed the lung sound signal amplifying, filtering and other pretreatment, then the lung sound signals of the pretreatment were sent to the external A/D chip for sampling, the acquisition of lung sound signals were saved as the. WAV audio file stored in the SD card, finally, using the short time Fourier transform to complete the time-frequency domain analysis of lung sound signals. Through the system can accurately detect the patient's lung sound signals, and using the stereo headphones can realize synchronous auscultation of the patient.