低噪声电子听诊器的设计

The design of the low noise electronic stethoscope

心音、呼吸音是人体重要的声音信号,是医生进行心脏和呼吸系统疾病诊断的重要信息依据。而一般的听诊器引入的噪声较大,影响了诊断的正确性。为实现提高听诊的准确度,需要设计一种低噪声电子听诊器电路。此设计主要包括低噪声的前置级放大电路、滤波电路以及功率放大电路。通过这种低噪声电子听诊器的电路设计,实现了对心音和呼吸音的低噪提取,为实现对心音和呼吸音的正确诊断奠定了良好的基础。

Heart sounds and lung sounds are important voice signals of human body, and contain important information for cardiopulmonary disease diagnosis. And the noise of the common stethoscope is high, affect the validity of the auscultation. In order to improve the accuracy of auscultation, a kind of low noise circuit of electronic stethoscope is needed. It mainly includes a low noise preamplifier circuit, a filter circuit and a power amplifier circuit. The design of electronic stethoscope circuit realizes the extraction of low noise of heart sound and breathes sounds, and lays a good foundation for achieving the correct diagnosis of heart sounds and breath sounds.