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首页> 外文会议>Conference on Independent Component Analyses, Wavelets, and Neural Networks Apr 22-25, 2003 Orlando, Florida, USA >Rectification of Non-linearity in Pre-amplifier and A/D Converter of Biomedical Instruments
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Rectification of Non-linearity in Pre-amplifier and A/D Converter of Biomedical Instruments

机译：生物医学仪器前置放大器和A / D转换器中的非线性校正

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摘要

Nonlinear distortions are always introduced to biomedical signals during the acquisition stage, which consequently fail the traditional linear independent component analysis (ICA) methods for further signal processing. This paper investigates the non-linearity system function in the pre-amplifier and A/D converter of the biomedical instruments. A polynomial general model structure with adjustable parameters to approximate the nonlinear relation is proposed for medical instruments. Model parameters are validated using a typical electrocardiograph (ECG) acquisition system with sinusoids of varying frequency and amplitude. Thus the inverse nonlinear transform is applied to acquired data to cancel the nonlinear distortions. The ICA method is then applied to the originally linear mixed data, non-rectified data and also rectified data and the results are favorably compared in the designed experiment using both clinical ECGs and the simulated data from cardiac simulators.
机译：非线性失真总是在采集阶段引入到生物医学信号中，从而使传统的线性独立分量分析（ICA）方法无法进行进一步的信号处理。本文研究了生物医学仪器前置放大器和A / D转换器中的非线性系统功能。提出了一种可调参数的多项式通用模型结构，用于近似医疗器械的非线性关系。使用具有变化的频率和幅度的正弦曲线的典型心电图仪（ECG）采集系统验证模型参数。因此，将逆非线性变换应用于获取的数据以消除非线性失真。然后将ICA方法应用于原始线性混合数据，未校正数据以及已校正数据，并且在使用临床ECG和来自心脏模拟器的模拟数据进行的设计实验中，可以对结果进行有利地比较。

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