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Heart beat calculation method of heart sound signals with part of second heart sounds absent

A calculation method and heart sound technology, applied in the field of signal processing, to achieve the effect of great significance and improved accuracy

Active Publication Date: 2019-08-16
SICHUAN CHANGHONG ELECTRIC CO LTD
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  • Summary
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the segmental analysis of heart sound in most technical solutions is based on this conventional mode, but the type of heart sound is not limited to this one, and some irregular heart sound types are also very common. If the irregular heart sound can be analyzed Correct segmentation will greatly improve the accuracy of heart sound signal processing and recognition, which is of great significance to subsequent analysis

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  • Heart beat calculation method of heart sound signals with part of second heart sounds absent
  • Heart beat calculation method of heart sound signals with part of second heart sounds absent

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Embodiment

[0033] A schematic diagram of a normal heart sound signal is as figure 1 As shown, the schematic diagram of the partial missing heart sound signal of the second heart sound is as figure 2 As shown, this embodiment proposes a method for figure 2 The heart rate calculation method for the missing heart sound signal of the second heart sound part is shown. The irregular signal is segmented, and each segment is a heart sound cycle. After multiple corrections, the correct heart sound cycle is finally screened out, and the heart rate is calculated based on this , Used to calculate heart rate and follow-up analysis, including the following steps:

[0034] 1. Filter and denoise the obtained heart sound signal.

[0035] 2. Binarize the heart sound signal after filtering and denoising:

[0036] 1). Take the absolute value of the heart sound signal, and then calculate its average amplitude m;

[0037] 2). Calculate the threshold T1=m*(2-M / N) according to the average amplitude m, where M is th...

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Abstract

The invention discloses a heart beat calculation method of heart sound signals with part of second heart sounds absent. The method includes following steps: filtering and denoising collected heart sound signals; binarizing the heart sound signals after being filtered and denoised; respectively extracting coordinate positions of a first heart sound S1 and a second heart sound S2 at a wave peak according to a binarizing result, and sequentially marking the first heart sounds S1 and the second heart sounds S2 of two adjacent periods as S1, S2, temporary S1 and temporary S2; calculating heart rateunder the circumstance with part of the second heart sounds absent, traversing the whole heart sound signals to acquire the coordinate positions of a series of reliable S1s, and calculating real-timeheart rate of the heart sound signals according to a formula R=60*f / (temporary S1-S1). Irregular signals under the circumstance with part of the second heart sounds absent are segmented, each segmentis a heart sound period, a correct heart sound period is screened out finally through several times of correction, and heart rate is calculated on the basis of the correct heart sound period.

Description

Technical field [0001] The present invention relates to the technical field of signal processing, in particular to a heart rate calculation method for partial missing heart sound signals of the second heart sound. Background technique [0002] Heart sound is the sound produced by mechanical vibration caused by myocardial contraction and relaxation, valve opening and closing, and blood flow impacting the ventricular wall and aortic wall during the cardiac cycle. Heart sound is an important means to understand the state of the heart, and it has the irreplaceable clinical value of ECG monitoring. The heart sound signal is an unstable periodic cyclic signal, which can be segmented correctly to obtain an independent cycle, so that the heart rate can be calculated quickly, which is convenient for further analysis and identification. [0003] Conventionally collected heart sound signals generally include a first heart sound (S1) and a second heart sound (S2). The time interval from the m...

Claims

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Application Information

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IPC IPC(8): A61B7/04A61B5/024G10L21/0208G10L25/48
CPCA61B5/024A61B7/04G10L21/0208G10L25/48
Inventor 梁庆真周杨刘贤洪
Owner SICHUAN CHANGHONG ELECTRIC CO LTD