Heart rate calculating method based on heart sound signal autocorrelation analysis

A calculation method and autocorrelation technology, applied in medical science, stethoscopes, sensors, etc., can solve problems such as false cycle values, achieve the effect of small calculation, low hardware implementation requirements, and easy implementation

Active Publication Date: 2017-07-07
FOSHAN BAIBUTI MEDICAL TECH CO LTD
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Problems solved by technology

However, the waveforms of the first and second heart sound signals in the heart sound signal are similar. If the traditional correlation analysis method is directly used to calculate the heart rate, it is easy to get a false period value.

Method used

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  • Heart rate calculating method based on heart sound signal autocorrelation analysis
  • Heart rate calculating method based on heart sound signal autocorrelation analysis
  • Heart rate calculating method based on heart sound signal autocorrelation analysis

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Embodiment

[0044] This embodiment provides a heart rate calculation method based on autocorrelation analysis of heart sound signals, the process is as follows figure 1shown, including the following steps:

[0045] The first step is to use the recording hardware equipment to obtain the heart sound signal where N s is a positive integer;

[0046] Generally, when sampling heart sound signals, the sampling frequency of hardware equipment is generally divided into three levels: 22.05KHz, 44.1KHz, and 48KHz. Because heart rate calculation does not require high fidelity of heart sound, the lowest sampling rate of 22.05KHz is selected in this embodiment. In order to accurately calculate the heart rate, it is necessary to process at least two complete cycles of heart sound signals. At the same time, in order to reduce the amount of calculation, the selected signal should not be too long. In this embodiment, three complete cycles of heart sound signals are selected for calculation, and the calc...

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Abstract

The invention discloses a heart rate calculating method based on heart sound signal autocorrelation analysis. The method comprises the following steps: first, acquiring heart sound signals by utilizing a recording device; then, carrying out extracting on the heart sound signals, and carrying out dead zone nonlinear treatment, thus obtaining the signals to be analyzed and processed; carrying out autocorrelation operation on the signals obtained after extraction, thus obtaining an autocorrelation sequence; and then, carrying out dead zone nonlinear treatment on the autocorrelation sequence, extracting the position of the second period from the sequence obtained after processing, and calculating the period of the heart sound signals according to the peak of the second period, thus obtaining the heart rate. According to the heart rate calculating method, the autocorrelation sequence is obtained through autocorrelation treatment and dead zone nonlinear treatment, the heart rate is calculated from the autocorrelation sequence, the calculation for the heart rate can be accurately realized by adopting the heart sound signals, the calculation method is simple, the result is accurate, the requirements for hardware implementation are low, and the realization in wearable devices is very convenient.

Description

technical field [0001] The invention relates to the field of medical equipment and medical signal processing, in particular to a heart rate calculation method based on autocorrelation analysis of heart sound signals. Background technique [0002] Resting heart rate is one of the important indicators to reflect the health status of the body. Heart rate monitoring is of great significance for the medication and home care of heart disease patients. [0003] At present, the commonly used heart rate detectors on the market involve the following detection methods: [0004] 1. Oximetry: Oxygen content in the blood vessels changes with the heartbeat in a cycle of consumption-increased heart pumping-reconsumption, and the beating cycle is consistent with the heart rate. Oximetry uses red light with a wavelength of 660nm and near-infrared light with a wavelength of 940nm as the incident light source. Oxygen-carrying hemoglobin and non-oxygen-carrying hemoglobin in blood vessels have...

Claims

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Application Information

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IPC IPC(8): A61B5/0245A61B7/04
Inventor 莫鸿强王伟杰田翔田联房
Owner FOSHAN BAIBUTI MEDICAL TECH CO LTD
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