Heart rate calculation method based on heart sound

Abstract

The invention relates to the technical field of medical health, in particular to a heart rate calculation method based on heart sound. The method comprises the following steps of: acquiring real-timeheart sound signal and processing the waveform of the heart sound signal to form a calculable characteristic waveform; detecting the time interval T between adjacent two peaks and calculating an instantaneous heart rate value; calculating arithmetic mean values of the instantaneous heart rate values in turn according to each successive five beats; utilizing a system estimation method to process the arithmetic average values to obtain corresponding estimation values; carrying out anti-misjudgment processing on the calculated values and the estimated values. According to the calculation method,under the premise of accurate detecting the heart rates, the calculation amount is small, the complexity is low and the real-time property is good, and the calculation method is suitable for calculation on the basis of an embedded chip, so that the development cost of a enterprise product can be reduced; Kalman estimation equation is used in the data processing, so that the final result cannot beinfluenced by the signal-to-noise ratio and the human and environmental interference, and meanwhile, stable and reliable heart rate results can be obtained.

Description

technical field [0001] The invention relates to the field of medical and health technologies, in particular to a heart sound-based heart rate calculation method. Background technique [0002] Heart rate refers to the number of heartbeats per minute of a normal person in a quiet state, generally 60 to 100 beats per minute. It is an important physiological indicator that reflects the health of a person. The sound produced by the mechanical vibration caused by the blood flow hitting the wall of the ventricle, the wall of the aorta, etc. [0003] A cardiac cycle can produce 4 heart sounds: the first (S 1 ), the second (S 2 ), third (S 3 ), fourth (S 4 ) heart sound. Usually only the first and second heart sounds can be heard by auscultation. A cardiac cycle is defined as two consecutive S 1 The heart rate calculation is based on the location of the cardiac cycle. [0004] Normally, S 1 , S 2 The position where the amplitude is the largest, but due to individual differe...

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Problems solved by technology

[0004] Normally, S 1 , S 2 The position where the amplitude is the largest, but due to individual differences, some heart sound signals may appear S 2 In addition, the noise amplitude introduced during the acquisition process is usually almost the same as the heart sound signal, which makes the shape of the heart sound signal changeable and the discrimination is complicated. It is difficult to obtain the heart rate quickly, stably and accurately in the existing technology.

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