Quality evaluation method of heart sound signals
A signal quality assessment and signal quality technology, applied in stethoscope and other directions, can solve the problem of no heart sound signal quality classification and other issues
Active Publication Date: 2016-01-06
SICHUAN CHANGHONG ELECTRIC CO LTD
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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.
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[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 time x, T=t-t1....
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The invention relates to quality evaluation of collected signals.The quality evaluation method of heart sound signals is provided and comprises following steps: firstly, collecting heart sound signals and intercepting signal segments used for evaluation by a system; secondly, performing five-layer wavelet decomposition of signal segments based on an SYM6 wavelet function and calculating the approximation coefficient in the fifth-layer and five-layer detail coefficients by the system; then, filtering soft threshold of the approximation coefficient in the fifth-layer and five-layer detail coefficients by the system; next, making energy calculations of the approximation coefficient in the fifth-layer and five-layer detail coefficients after soft threshold is filtered by the system in order to obtain energy of coefficients in all layers; and finally, calculating a signal quality factor by the system according to capabilities of coefficients in all layers.The system is also used for grade separation of heart sound signals according to the signal quality factor. The higher grade, the better heart sound quality is obtained. A user can conveniently know the quality of heart sound signals only by grade number such that the user is reminded to immediately adjust the posture, collect positions and environment for obtaining better heart sound signals.The quality evaluation method of heart sound signals is adapted to evaluation of heart sound signals.
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...
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Inventor 彭晶刘传银
Owner SICHUAN CHANGHONG ELECTRIC CO LTD