Feasibility study for extraction of breathing effort from pulse pleythsmograph signal

使用光电传感器获得的光电体积描记图（PPG）波形是心脏跳动的脉动表征。可以从PPG信号中提取诸如脉搏率和氧饱和度的丰富的各种生理信息，并且最近，研究人员已经专注于从该波形中提取呼吸信号。尽管对从PPG信号中提取呼吸信号感兴趣并进行研究，但似乎通常仅估计一个呼吸参数，即呼吸速率。这是一种限制，因为诸如呼吸变异性和呼吸努力的其他参数承诺提供关于对象的生理的更深入的信息。此外，这一领域的研究还没有转化为有形的系统，可以在家庭睡眠等实际临床应用中找到用途

The photoplethysmogram (PPG) waveform obtained using a photo sensor is a pulsatile characterization of the beating of the heart. A rich variety of physiological information such as pulse rate, and oxygen saturation can be extracted from the PPG signal, and recently, researchers have focused on extracting respiratory signals from this waveform. Despite interest in and research on the extraction of respiratory signals from PPG signals, it seems that only one respiratory parameter, namely, the respiratory rate, is commonly estimated. This is a limitation, since other parameters such as respiratory variability and respiratory effort promise to provide more in-depth information about the physiology of the subject. Moreover, research in this area has not been transformed into tangible systems that can find use in real-word clinical applications like home sleep