Visual Heart Sounds And Respiratory Sounds Electronic Auscultation System

Heart sound and respiratory sound are important indications which reflect physiology and pathology of heart and lung. Stethoscopy for heart sound and repiratory sound is an important mean of diagnosis of cardiovascular and pulmonary diseases. By analyzing the flaws of traditional heart sound and respiratory sound stethoscope, a visual heart sound and respiratory sound electronic auscultation system is proposed in this paper. The clinician can inspect the real-time heart sound's and respiratory sound's waveform while stethoscoping by using this system.This paper introduces the resear(?)hing background and significance of the visual heart sound and respiratory sound electronic auscultation system. It also describes the signal detecting,processing and identifying technology in this field and the principle, classification of the heart sound and respiratory sound. Then the paper gives the system's whole designing plan. The plan has three aspects: the designing requirement,the system function and interface, the system structure. They are the indications of the system's hardware and software design.The paper expounds the hardware and software design of the system. The hardware design includes signal sensor,amplifer module, filter module, MCU module,LCD module, power amplifer module and power module. In each module, it describes the used chip and the circuit schematic diagram. The software design introduces the software flow chart,system initialization,interrupt processing and the key functions, such as data gathering function, data processing function and data displaying function.Finally, this paper summarizes the achievement of the system, it points out the scarcity of the system design, as well as the items that could be improved or perfected in the future.