Automatic friction sound interference elimination method for electronic stethoscopes

An electronic stethoscope and fricative technology, applied in stethoscopes, instruments, speech analysis, etc., can solve problems such as fricative interference, weak auscultation signals, lack of automatic identification and positioning methods, and achieve the effect of automatically eliminating fricatives.

Active Publication Date: 2019-05-28
SUZHOU MELODICARE MEDICAL TECH CO LTD
View PDF12 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The unsolved problems of this patent include: (1) when the microphone is not in contact with the human body, the received auscultation signal is relatively weak, which may affect the signal quality in some cases; (2) when the contact microphone in the auscultation head reaches a certain Contact with the human body is still possible under pressure, and friction noise interference may still occur at this time
[0008] 1. At present, there is no automatic identification and positioning method for the fricative noise interference area: in fact, even if there is only this link in the electroni

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
  • Automatic friction sound interference elimination method for electronic stethoscopes
  • Automatic friction sound interference elimination method for electronic stethoscopes
  • Automatic friction sound interference elimination method for electronic stethoscopes

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0103] Please refer to figure 2 As shown, read a period of 3 seconds, sampling rate f s = 4kHz, the auscultation data x disturbed by fricative noise in between, divided by the point with the largest absolute value for normalization, figure 2 The middle is the waveform and time-spectrum diagram.

[0104] The data x is divided into a data unit with a length of 0.2s, and the data units overlap for 0.1s, and the MFCC of each data unit is calculated. Assuming that a certain data unit is expressed as s, and the length is M=0.2×4000=800, the following operations are performed:

[0105] Add a Hanning window h whose length is M=800 points to s, and do Point FFT to compute the power spectrum:

[0106] use f mel (f)=2959×log 10 (1+f / 700) set the linear frequency from 0 to f s / 2 is transformed into Mel frequency, and Q=20 continuous overlapping 50% regions are equally divided in the Mel frequency domain, and a filter bank ψ containing Q=20 triangular filters is constructed ac...

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 discloses an automatic friction sound interference elimination method for electronic stethoscopes, which relates to the technical field of stethoscope silencing. The method comprises: carrying out empirical mode decomposition for data XK in the Kth interference time interval in x, so that M<K> intrinsic mode function components shown in the drawing are obtained; after low-pass filtering is carried out for IMF<2> and IMF<3>, calculating related coefficients of IMF<2> and IMF<3> frame by frame, determining P data point ranges respectively recorded in the drawing, and setting all data outside the data point ranges as zeros; calculating the equation shown in the drawing, and sequentially assigning update values to the edge data segments of the P data point ranges by triple splineinterpolation. The method can rapidly and accurately detect and locate one or more friction sound interference regions which can appear in an auscultating signal; and while friction sound interference on single-channel auscultation data can be automatically eliminated, the friction sound of a plurality of friction sound interference regions in the same segment of data can be automatically eliminated.

Description

technical field [0001] The invention belongs to the technical field of stethoscope noise reduction processing, in particular to a method for automatically eliminating friction noise interference of an electronic stethoscope. Background technique [0002] Auscultation enables physicians to understand the patient's condition in a simple and easy way at the first time. Traditional auscultation technology is often restricted by factors such as the location of the doctor and the level of medical skills. With the vigorous development of the Internet of Things (IoT) technology, various types of electronic stethoscopes continue to appear, enabling real-time monitoring and automatic transcription of patients' heart and lung sound data. , cloud diagnosis and treatment and intelligent diagnosis become possible, and a series of problems presented in the research process of electronic stethoscope have also attracted much attention. The electronic stethoscope converts weak heart sounds, ...

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
IPC IPC(8): A61B7/04G10L21/0224G10L21/0232G10L25/18G10L25/24G10L25/45
CPCA61B7/04G10L21/0224G10L21/0232G10L25/18G10L25/24G10L25/45
Inventor 蔡盛盛胡南徐兴国周宁
Owner SUZHOU MELODICARE MEDICAL TECH CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap