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Journal of Biomedical Optics

Fast digital lock-in amplifier for dynamic spectrum extraction
Author(s): Mei Zhou; Gang Li; Ling Lin
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Paper Abstract

An appropriate method for spectrum extraction for better signal-to-noise ratio (SNR) and lower computational cost is essential in noninvasive detection. We have first studied two existing extraction methods for dynamic spectrum (DS) comparatively: frequency domain analysis and single trial estimation; after analyzing the advantages and disadvantages theoretically, a new method based on a fast digital lock-in amplifier (FDLIA) was developed to overcome the limitations of these two existing methods. The feasibility of the new method was verified by experiments and the results demonstrated that the FDLIA method based on DS had greatly simplified the computation of frequency domain analysis without the method error; moreover, the continuous signal was cut into several short segments in FDLIA and the gross errors from an episode of pulse wave were eliminated, and thus SNR improved. Therefore, the FDLIA method utilizing the advantages of both existing methods can be effectively realized in a general embedded system in real time for its simple algorithm.

Paper Details

Date Published: 7 May 2013
PDF: 9 pages
J. Biomed. Opt. 18(5) 057003 doi: 10.1117/1.JBO.18.5.057003
Published in: Journal of Biomedical Optics Volume 18, Issue 5
Show Author Affiliations
Mei Zhou, Tianjin Univ. (China)
Gang Li, Tianjin Univ. (China)
Ling Lin, Tianjin Univ. (China)

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