BCG signal noise reduction method and system

Abstract

The invention discloses a BCG signal noise reduction method and system. The method comprises the steps that an initial BCG signal is acquired; removing body movement interference of the initial BCG signal according to a preset method to obtain a second BCG signal; processing the second BCG signal according to a weighting window function to obtain a third BCG signal; processing the third BCG signalaccording to a low-pass filtering method to obtain a fourth BCG signal; processing the fourth BCG signal according to a wavelet threshold denoising method, reconstructing the M layers of features toobtain a final BCG signal, and outputting the final BCG signal; the method and the system are high in adaptability, have a good denoising effect on different signals, are simple in parameter structureand low in calculation complexity, and solve the problems that an existing BCG signal is poor in denoising effect and a denoising algorithm is single and complex.

Description

technical field [0001] The present invention relates to the field of medical technology, and more specifically, to a BCG signal noise reduction method and system. Background technique [0002] The ballistocardiogram (BCG) is the change of the external pressure of the human body caused by the beating of the heart and the blood circulation of the aorta, which can be used for non-contact heart activity detection. When the heart ejects blood, it will cause a change in the gravity of the human body, and the heart shock signal is the signal of the gravity change caused by the ejection obtained by the pressure sensor. By detecting BCG signals, it is possible to closely observe changes in the heart, detect abnormalities in the heart in time, and minimize the loss of the disease. BCG signal is a kind of human biological signal, which has the characteristics of low frequency and low intensity, and is easily interfered by breathing, body movement, and power frequency noise. As a resul...

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Problems solved by technology

[0004] In order to solve the existing BCG signal denoising effect in the background technology is poor, the denoising algorithm is relatively simple and complicated, the present invention provides a BCG signal denoising method and system, the method and system are based on weighted window function and wavelet Threshold denoising has achieved a good denoising effect on BCG signal denoising, which is highly complex, morphologically changeable, and contains a variety of different frequency noises; the BCG signal denoising method includes:

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