Synthesis of PPG Waveform Using PSPICE and Simulink Model

Ankita Mukherjea, Parshati Chaudhury, Alvin Karkun, Soumalya Ghosh, Subhajit Bhowmick
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Abstract

Volumetric changes in the microvascular tissue can be studied by using an optically obtained plethysmogram; a photoplethysmogram (PPG). This has gained much intrigue in the modelling of PPG signal using appropriate Synthesis techniques. The obtained circuit is used to reconstruct PPG waveform. The current work is a proposal of a method for the development of an equivalent circuit to simulate the PPG waveform. Based on the amount of energy, the PPG signal was segregated into ‘complex’ and ‘plain’ zones. To construct that, the individual waves were modelled using Fourier analysis method by MATLAB Curve Fitting Tool Box. Then, after generating the Fourier series coefficients from MATLAB, we obtained the sine and cosine components of the data along with the DC component. The sine and cosine components along with the DC component are added via an adder circuit, followed by an inverter, which generates the final PPG waveform using PSPICE. The building blocks of the Simulink model have been developed using sine and cos function generator blocks, and adder blocks thereby generating an appropriate waveform. The errors between the actual normal PPG waveform and reconstructed PPG waveform using PSPICE for one cycle have been computed, which results in deviations within acceptable ranges of deviation.
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利用PSPICE和Simulink模型合成PPG波形
微血管组织的体积变化可以通过光学获得的体积描记图来研究;光容积图(PPG)这在使用适当的合成技术模拟PPG信号方面获得了很大的兴趣。利用得到的电路重构PPG波形。目前的工作是提出一种开发等效电路来模拟PPG波形的方法。根据能量的大小,PPG信号被分为“复杂”和“普通”区域。为此,利用MATLAB曲线拟合工具箱,采用傅里叶分析方法对各个波进行了建模。然后,在MATLAB中生成傅里叶级数系数后,我们得到数据的正弦和余弦分量以及直流分量。正弦和余弦分量以及直流分量通过加法器电路添加,然后是逆变器,使用PSPICE生成最终的PPG波形。使用正弦和余弦函数生成器块和加法器块开发了Simulink模型的构建块,从而生成适当的波形。计算了一个周期内实际正常PPG波形与PSPICE重构的PPG波形之间的误差,得到的偏差在可接受的偏差范围内。
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