Abstract
Abstract The most simplified virtual instrument (SVI) is designed through the mini-interface board (seven components), general PC Sound card and MATLAB programs. To deal with the limits followed by our mini-interface board, we cram necessary filters and noise-depressor into PC in form of software. The other key technologies include impedance matching for optimal signal transportation and near-infrared wavelength selection for improving the acquisition signal sensitivity in verification tests aiming at smile versus calm. Also three important contrast cases are discussed to support further our design validity. This work may enhance the base on brain health monitoring at home.
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