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Heart rate calculation method of heart sound signals with part of first heart sounds missing

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

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

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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

Method used

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  • Heart rate calculation method of heart sound signals with part of first heart sounds missing
  • Heart rate calculation method of heart sound signals with part of first heart sounds missing

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Embodiment

[0031] A schematic diagram of a normal heart sound signal is shown in figure 1 As shown, the schematic diagram of the missing heart sound signal of the first heart sound part is as follows figure 2 As shown, this embodiment proposes a method for figure 2 The heart rate calculation method for heart sound signal missing in one 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. It is used to calculate heart rate and subsequent analysis, including the following steps:

[0032] 1. Filter and denoise the obtained heart sound signal.

[0033] 2. Perform binarization processing on the heart sound signal after filtering and denoising.

[0034] 1). Take the absolute value of the signal, and then calculate its average amplitude m;

[0035] 2). Calculate the threshold T1=m*(2-M / N) according to the avera...

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Abstract

The invention discloses a heart rate calculation method of heart sound signals with part of first heart sounds missing. 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 storing the coordinate positions of the first heart sound S1 and the second heart sound S2 of each period in an array a [0], a[1],...a[n]; calculating heart rate under the circumstance with part of the first heart sounds missing, traversing the whole heart sound signals to acquire the coordinate positions of a series of reliable S1s, and calculating real-time heart 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 segment is aheart 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 invention relates to the technical field of signal processing, in particular to a method for calculating heart rate in which a heart sound signal is partially missed by the first heart sound. Background technique [0002] Heart sounds are the sounds produced by mechanical vibrations caused by myocardial contraction and relaxation, valve opening and closing, and blood flow impacting on the walls of the ventricle and aorta during the cardiac cycle. Heart sound is an important means to understand the state of the heart, and has irreplaceable clinical value of ECG monitoring. The heart sound signal is an unstable periodic cycle signal, and the independent cycle can be obtained by correctly segmenting it, so as to quickly calculate the heart rate and facilitate further analysis and identification. [0003] The conventionally collected heart sound signal generally includes the first heart sound (S1) and the second heart sound (S2), and the interval from...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B7/04A61B5/024G10L21/0208G10L21/0232
CPCA61B5/024A61B7/04G10L21/0208G10L21/0232
Inventor 梁庆真周杨刘贤洪
Owner SICHUAN CHANGHONG ELECTRIC CO LTD
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