Abstract
It's to introduce the structure and operating principle of two electronic stethoscopes,one with a simple noise-stop pickup,while the other one with an active inverting denoiser.By subjective auscultation comparison and biological sounds processing via spectral view software,it got visual effects and made objective comparison.The new active inverting denoised stethoscope,the circuit of which is stable and reliable,can get a better denoised effect than the simple noise-stop pickup stethoscope.The new one is easy to operate,and can display the heart sounds,breath sounds and bowel sounds.It can solve the problem of external noise interfering auscultation better than other means. Key words: Inverting denoised; Electronic stethoscope; Spectral view
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