PPG heart rate extraction device and method based on cascaded RLS adaptive filtering

Abstract

The invention provides a PPG signal heart rate extraction device and method based on cascaded RLS adaptive filtering. The device is composed of a PPG sensor, an acceleration sensor, a data acquisitionmodule, a data storage module, a signal analysis unit and the like. The method comprises the steps that firstly, band-pass filtering is carried out on an original PPG signal to obtain a preprocessedsignal which only contains a frequency band corresponding to the heart rate and from which baseline drifts are filtered out; then, a cascaded RLS adaptive filter is constructed to filter out motion artifacts in the PPG signal; and finally, a corresponding heart rate value is calculated by utilizing heart rate extraction and optimization algorithms. The PPG signal heart rate extraction method basedon cascaded RLS adaptive filtering can be used for filtering out the motion artifacts of the PPG signal so that the accuracy of heart rate detection can also be improved under the condition of strenuous exercise; the method can adapt to changes of PPG signal forms of different individuals and the same individual; and meanwhile, on the basis of measurement of a single-path PPG signal, wearing of auser and the popularization of the device can be facilitated.

Description

technical field [0001] The invention relates to a PPG signal heart rate extraction device and method based on cascaded RLS adaptive filtering. Background technique [0002] Heart rate is a very important physiological parameter. It is an effective and simple method to evaluate heart function in sports training monitoring and physical fitness evaluation. The electrocardiogram is the most important and accurate way to calculate the heart rate, but the acquisition of the electrocardiogram signal is not convenient and comfortable in actual use. In recent years, photoplethysmography (photoplethysmography, PPG) has become one of the commonly used methods to detect heart rate. Due to the simple sensor and easy acquisition of the signal, many modern wearable devices, such as smart watches and smart wristbands, use wrist The internal PPG signal realizes real-time estimation of heart rate. However, the PPG signal is a signal of human subcutaneous blood volume change collected by a p...

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Problems solved by technology

The above methods have a good filtering effect on the MA in the PPG signal during exercise, but the accuracy of the extracted heart rate is not good when the PPG signal mutation is obvious in the case of strenuous exercise

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