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Research on digital pulse oximeter based on optical frequency converter

机译:基于光变频器的数字脉搏血氧仪的研究

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This paper specifically describes the design of hardware and software of a digital pulse oximeter based on ARM core embedded system and light-frequency converter. In this study, a light-frequency converter instead of a photodiode was adopted to receive the light transmitting, which greatly simplified the design of hardware. Besides, traditional methods of calculate frequency of rectangle signal were improved and an algorithm with stable sampling rate and high resolution was proposed. Based on the filtering and detecting methods of the pulse signal, the baseline drift and the noise on high frequency were successfully removed by applying integer coefficient filter. A detecting algorithm based on difference and threshold was proposed, and the future points of the signal can be extracted effectively. The result shows that this oximeter can overcome usual noise, the software is very flexible and simple in structure.
机译:本文具体介绍了基于ARM内核嵌入式系统和光变频器的数字脉搏血氧仪的硬件和软件设计。本研究采用光频率转换器代替光电二极管接收光传输,大大简化了硬件设计。此外,改进了传统的矩形信号频率计算方法,提出了一种稳定的采样率和高分辨率的算法。基于脉冲信号的滤波和检测方法,应用整数系数滤波器可以成功消除基线漂移和高频噪声。提出了一种基于差分和阈值的检测算法,可以有效地提取信号的未来点。结果表明,该血氧仪可以克服常规噪声,软件非常灵活,结构简单。

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