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1·With NIR spectra, the analytical information is contained in small spectral variations and usually dominated by the features such as light scattering, background noise and baseline drift.

近红外光谱不但包含着物质成分信息，而且这些信息完全掩盖在众多复杂背景当中（包括光散射、背景噪声以及背景漂移）。

2·Testing receiver's internal noise from zero baseline tests is recognized by many people.

检定接收机内部噪声一般采用零基线法。

3·The invention has the advantages of high stability of the emergent electron current, small noise baseline and the like.

本发明具有出射电子流稳定、噪声基线小等优点。

4·Original ECG preprocessing:remove noise such as high-frequency power supply and interference factors such as baseline drift by wavelet function and filter;

原始心电信号的预处理：利用小波降噪函数和滤波器去除电源干扰的高频噪声和基线漂移及抖动等干扰因素；