Stethoscope heart sound signal processing method and stethoscope device

Abstract

The detected heart sound signal is adjusted to an adequate volume and quantitavely analyzed with high accuracy, and a processing to improve the sound quality of the heart sound signal to make the heart sound signal easy to listen to. In analyzing a heart sound, an evaluation index of a heart sound feature value waveform generated by using heart sound data and a vibration model is determined, the center of a data set is so determined that the evaluation function expressing the dispersion of the evaluation index takes on a minimum value, and the evaluation index for a threshold and the distribution of the center of the data set are determined. To improve the quality of the heart sound, after substantially eliminating the phase difference and multiply the heart sound signal and the heart sound feature value waveform, the product is used as output heart sound data. In adjusting the volume of the heart sound signal, the up gain is determined using a reference table according to the average intensity for a time Ta of the detected heart sound signal, and the heart sound signal for a time Tb after the time Ta is amplified and recorded.

Description

Auscultation heart sound signal processing method and auscultation device technical field The invention relates to a processing method for auscultation heart sound signals and an auscultation device. Background technique In Japan, the death rate due to heart disease is relatively high, surpassing cerebral apoplexy in 1985 and becoming the second largest. Among heart diseases, myocardial infarction, which is called cardiac insufficiency and ischemic heart disease, accounts for 30% of other acute deaths of unknown cause. Lifestyle diseases such as cardiovascular disorders change slowly, so they cannot be diagnosed correctly without long-term quantitative treatment observations, and it is said that there are many undiscovered cases. In recent years, people have been developing systems for health management and diagnosis at home or in companies. Stethoscopes have gradually become popular as instruments for auscultating heart sounds, breath sounds, etc., along with scales, th...

AI Technical Summary

Problems solved by technology

This heart sound analysis method confirms the abnormality of the heart sound by analyzing and evaluating the time width obtained from the vibration response. However, the heart sound data and the shape of the vibration response vary depending on the type and characteristics of the abnormal heart sound. , so according to this analysis method, it may not be possible to accurately grasp the characteristics of various abnormal heart sounds

As mentioned above, in the auscultation apparatus of the prior art, the following points are insufficient, and there are difficulties in that the apparatus is complicated and expensive

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