Calculation method of heart rate based on heart sounds

Abstract

A method for calculating heart rate on the basis of heart sounds, the method comprising: obtaining a real-time heart sound signal and processing a waveform of the heart sound signal so as to form a calculable characteristic waveform; detecting a time interval T between two adjacent peaks and calculating an instantaneous heart rate value; sequentially calculating an arithmetic mean value of instantaneous heart rate values according to every five consecutive beats; using a systematic estimation method on the arithmetic mean value to obtain a corresponding estimated value; and performing misjudgment prevention processing on the calculated value and the estimated value. On the premise of detecting heart rate accuracy, the described method has a small amount of calculation, low complexity and good real-time performance, and is suitable for calculation on the basis of embedded chips, which may reduce the costs of product development for enterprises; a Kalman estimation equation is used in data processing so that the final result may be free from the influence of signal-to-noise ratio and human and environmental interference, and stable and reliable heart rate results may 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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