Abstract
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.
Highlights
The environmental pollution has resulted in increased incidence of lung diseases, lung sounds are an important indicator to reflect the physiological and pathological features of the lung, lung sound signals analysis and recognition technology is with the aid of computer and digital signal processing technology integrated with the patient's lung sounds medical information, research the inner link of lung sounds and lung diseases, through the abnormality of lung sound signals to detect patients with pulmonary organ and functional lesions [1,2,3]
The digital lung sounds acquisition and analysis recognition method overcomes the limitations of the traditional stethoscope, can quantify the changes of lung sounds, and the measured results can be permanent record and real-time graphical representation, in order to help doctors diagnose and management patients with thoracic diseases, so in recent years, research on digital acquisition and analysis of lung sounds significantly increased [4, 5]
The lung sound signals after lung sound signals processing module can directly drive headphones, or sampled by external A/D sampling chip controlled by the microprocessor STM32F103Z, And lung sound signals sampled is saved as.WAV audio files stored on the SD card
Summary
The environmental pollution has resulted in increased incidence of lung diseases, lung sounds are an important indicator to reflect the physiological and pathological features of the lung, lung sound signals analysis and recognition technology is with the aid of computer and digital signal processing technology integrated with the patient's lung sounds medical information, research the inner link of lung sounds and lung diseases, through the abnormality of lung sound signals to detect patients with pulmonary organ and functional lesions [1,2,3]. The digital lung sounds acquisition and analysis recognition method overcomes the limitations of the traditional stethoscope, can quantify the changes of lung sounds, and the measured results can be permanent record and real-time graphical representation, in order to help doctors diagnose and management patients with thoracic diseases, so in recent years, research on digital acquisition and analysis of lung sounds significantly increased [4, 5]. Feiba Chang et al.: The Acquisition and Short Time Fourier Transform of Lung Sounds file stored in the SD card to facilitate subsequent analysis, It can be uploaded to the PC that used as controller of lung sound signals waveform display and data processing, So the function of the system is more abundant, the data storage is large, and the use is convenient
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