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Heart-sound enhancement method based on improved spectral subtraction

A spectral subtraction and heart sound technology, applied in the field of heart sound enhancement based on improved spectral subtraction, can solve problems such as affecting the results of heart sound analysis, and achieve the effects of facilitating analysis and processing, improving signal-to-noise ratio, and removing noise

Inactive Publication Date: 2016-08-24
UNIV OF JINAN
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AI Technical Summary

Problems solved by technology

These interference noises are unfavorable factors to the recorded heart sound waveform, if not dealt with, it will affect the results of heart sound analysis
[0003] The traditional spectral subtraction method considers the noise to be stationary noise, but the noise in the entire heart sound segment may also be non-stationary noise. At the same time, due to the inhomogeneity of the heart sound energy distribution, if the same noise spectral power value is used for the entire heart sound segment, it cannot meet the actual requirements.

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  • Heart-sound enhancement method based on improved spectral subtraction
  • Heart-sound enhancement method based on improved spectral subtraction
  • Heart-sound enhancement method based on improved spectral subtraction

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[0030] Below in conjunction with specific embodiment, further illustrate the present invention. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

[0031] Described in the present invention is a kind of heart sound enhancement method based on improved spectrum subtraction, comprising the following steps:

[0032] Step 1, use the Hilbert-Huang transform to extract the heart sound envelope, and then segment based on the heart sound envelope to obtain a complete noisy heart sound signal including diastole and systole y(n)=x(n)+ u(n), where x(n) represents a pure heart sound ...

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Abstract

The invention discloses a heart-sound enhancement method based on improved spectral subtraction, and mainly relates to the technical field of biologic signal processing. The method comprises the following steps: 1, extracting heart-sound envelope by utilizing Hilbert-Huang transform, segmenting based on the heart-sound envelope, and acquiring a complete a noisy heart-sound signal comprising a relaxation period and a contraction period; 2, carrying out FFT transformation on the extracted noisy heart-sound signal to obtain a frequency spectrum of the noisy heart-sound signal; 3, processing the frequency spectrum of the noisy heart-sound signal; 4, carrying out inverse Fourier transform on a frequency spectrum of the obtained pure heart-sound signal to obtain a pure heart-sound signal. The heart-sound enhancement method has the beneficial effects that the method adopts different noise spectrum power values, thus being capable of effectively removing noise and improving signal to noise ratio.

Description

technical field [0001] The invention relates to the technical field of biological signal processing, in particular to a heart sound enhancement method based on improved spectrum subtraction. Background technique [0002] The detection and analysis of heart sounds is an essential means to understand the state of the heart and blood vessels, and it can provide a lot of clinically meaningful diagnostic information. With the development of new technologies, the current instruments and methods for recording heart sounds have been greatly improved, but in the process of recording, the introduction of interference noise is still inevitable, such as friction between the heart sound sensor and the skin, breathing noise , the interference signal of the human body and the interference generated by the recording instrument. These interfering noises have unfavorable factors on the recorded heart sound waveform, and will affect the results of heart sound analysis if not dealt with in a c...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/00
CPCA61B5/7203A61B5/7257
Inventor 张鲁王磊杨星海李念强张乐娟
Owner UNIV OF JINAN
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