Unlock instant, AI-driven research and patent intelligence for your innovation.

Heart sound signal quality assessment method

A technology for evaluating signal quality and heart sounds, applied to stethoscopes, etc., can solve the problems of signal quality grading without heart sounds

Active Publication Date: 2018-03-30
SICHUAN CHANGHONG ELECTRIC CO LTD
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no effective technology in the prior art that can realize the quality grading of heart sound signals.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Heart sound signal quality assessment method
  • Heart sound signal quality assessment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0029] This example aims to propose a real-time display method of the heart sound signal quality: while using an electronic stethoscope to collect the heart sound signal, the signal quality level is displayed to the user in real time. In this way, the acquisition status is fed back to the user in time, which is beneficial for the user to adjust the posture, auscultation position and use environment. Ultimately, the collection time is shortened, the collection effect is improved, and the collection frequency is reduced, thereby greatly improving the user experience in the heart sound collection process.

[0030] Specifically, the heart sound signal quality assessment method includes the following steps:

[0031] Step 1. The system collects the heart sound signal and intercepts the signal segment for evaluation; 1. Intercepts the signal segment x for evaluation: for the current time t, intercept the heart sound signal x from time t1 to time t. T is the length of x time, T=t-t1....

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to quality assessment of acquisition signals. The invention provides a method for evaluating the quality of heart sound signals. First, the system collects heart sound signals and intercepts signal segments for evaluation; secondly, the system performs five-level wavelet decomposition on the signal segments based on the SYM6 wavelet function, and calculates the fifth level approximation coefficient and the fifth-level detail coefficient; then, the system performs soft threshold filtering on the fifth-level approximation coefficient and the fifth-level detail coefficient; then, the system performs energy calculation on the fifth-level approximation coefficient and the fifth-level detail coefficient after soft threshold filtering, The energy of the coefficients of each layer is obtained; finally, the system calculates the signal quality factor according to the power of the coefficients of each layer. The system also classifies the heart sound signal according to the signal quality factor. The higher the level, the better the heart sound quality. It is convenient for the user to know the quality of the heart sound signal only according to the level number, thereby reminding the user to immediately adjust the posture, collection position and collection environment to obtain better results. heart sound signal. It is suitable for evaluating the quality of heart sound signal.

Description

technical field [0001] The invention relates to the quality evaluation of the collected signal, in particular to the evaluation of the quality of the heart sound signal. Background technique [0002] Heart sound refers to the sound produced by the vibration caused by myocardial contraction, heart valve closing and blood hitting the wall of the ventricle, the wall of the aorta, etc. It can be heard with a stethoscope on a certain part of the chest wall. And now it is also possible to listen to it with an electronic stethoscope, and convert the heart sound into a digital audio signal and save it. [0003] As a kind of sound signal, the heart sound signal is very susceptible to interference. The main sources of interference are: 1. External unstable noise interference; 2. Various biological sounds in the body, such as bowel sounds and breathing sounds; 3. Due to user Frictional sound caused by an electronic stethoscope not being placed stably. Moreover, in addition to the re...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): A61B7/04
Inventor 彭晶刘传银
Owner SICHUAN CHANGHONG ELECTRIC CO LTD