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Heart sound signal period parameter estimating method

A technology of parameter estimation and signal period, which is applied in the research field of biological signal detection and recognition, can solve the problems of poor reliability of heart sound cycle parameters, and achieve the effect of good reliability and easy implementation

Active Publication Date: 2016-01-20
HARBIN NORMAL UNIVERSITY
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of poor reliability of the heart sound cycle parameters obtained by the existing cycle parameter estimation method of the heart sound signal. The present invention provides a method for estimating the cycle parameter of the heart sound signal

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  • Heart sound signal period parameter estimating method
  • Heart sound signal period parameter estimating method
  • Heart sound signal period parameter estimating method

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Embodiment Construction

[0048] combine figure 1 , figure 2 and image 3 Describe this embodiment, a kind of heart sound signal period parameter estimation method described in this embodiment, described method comprises the following steps:

[0049] Step 1, preprocessing the heart sound signal to be estimated:

[0050] The heart sound signal to be estimated is energy-standardized, then down-sampled to 2kHz, and a 6-order Butterworth filter band-pass filter is used to band-pass filter the down-sampled heart sound signal to filter out the cut-off frequency. For other sounds and noises, the preprocessed heart sound signal x(n) is obtained, where n is the sampling index of the heart sound. The obtained heart sound signal is as figure 1 shown.

[0051] Step 2: Extract the average Shannon energy envelope signal from the preprocessed heart sound signal:

[0052] Using a sliding window with a length of W and a frame shift of W / 2 to act on the preprocessed heart sound signal x(n) for framing, and calcul...

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Abstract

The invention discloses a heart sound signal period parameter estimating method, and belongs to the field of research on biological signal detection and identification, for solving the problem of poor reliability of period parameter estimation. The method comprises the following steps: 1, preprocessing heart voice signals; 2, extracting average Shannon energy envelope signals from preprocessed heart sound signals; 3, smoothing the extracted envelope signals by use of a singular value spectrum analysis method; and 4, performing estimation of period parameters of the heart sound signals on smoothed envelope signals. The method provided by the invention has the advantages of easy realization, low algorithm complexity and good reliability, thereby being suitable for popularization and application.

Description

technical field [0001] The invention belongs to the research field of biological signal detection and identification. Background technique [0002] Various physiological signals of the human body reflect people's health status. Heart sound signal is one of the most important physiological signals of the human body. It is a reflection of the mechanical movement of the heart and cardiovascular system. a mechanical vibration. Heart sounds contain important information about the health status of the human body. By extracting this information and making effective identification, objective digital heart sound auscultation can be achieved, thereby providing reliable diagnostic results for patients. [0003] However, the heart sound signal is a non-stationary quasi-periodic cycle signal, which needs to be processed in segments to obtain the heart sound signal reflecting each heart cycle. Therefore, an important premise of a reliable heart sound recognition technology is that the ...

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Application Information

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IPC IPC(8): A61B7/04
Inventor 邓世文高建芳王超孙乐汉
Owner HARBIN NORMAL UNIVERSITY