Breathing and heartbeat signal extracting method based on light interference principle

Abstract

The invention relates to a breathing and heartbeat signal extracting method of an intelligent mattress system based on a light interference principle. The method includes the steps of extracting instantaneous frequency variation information of original light intensity signals and separating out other physiological noise signals in the outside world and a human body so as to extract true and effective breathing signals and heartbeat signals with interference light intensity signals of the intelligent mattress system as the treatment object through short-time Fourier transformation and wavelet packet decomposition and reconstruction. By means of the signal extracting method, the influences of the environment noise and other physiological signals close to the heartbeat and breathing frequencycan be removed through the signal extracting method, the calculating correctness of the heartbeat and breathing signal frequency is ensured, the processing difficulty of a non-phase demodulating modecan be effectively reduced, the system cost is reduced, and the great application requirements of light interference type optical fiber sensing on the aspect of vital sign monitoring can be met.

Description

technical field [0001] The invention relates to the field of human vital signs monitoring, and more specifically, to a method for extracting breathing and heartbeat signals of a smart mattress system based on the principle of light interference. Background technique [0002] With the increasingly serious problem of social aging and the increase of medical costs, nowadays, the real-time monitoring of vital signs indicators such as breathing and heartbeat for empty-nest elderly or bedridden patients has become one of the hot research issues at home and abroad. . According to statistics, the incidence of sleep-disordered breathing accounts for about 10-20% of the entire population, and as high as 40-60% for the elderly. How to accurately monitor the sleep status of patients and provide a basis for early diagnosis of sleep-disorder-related diseases is increasingly more people pay attention. At present, there is a photoplethysmography method to monitor human physiological chara...

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Problems solved by technology

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides a breathing and heartbeat signal extraction method applied to an optical interference system, and its purpose is to solve the problems of high hardware cost and complex demodulation methods of the optical interference system

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