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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