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. 2018 Aug 3;18(8):2550. doi: 10.3390/s18082550

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© 2018 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Schema for the signal processing library. The inputs for the system include the analog signal acquired from the sensor (signal), the requested fast Fourier transform (FFT) order, n, the c-parameter for the Gaussian window (c), the sampling frequency (fs) and a calibration factor (k_ampl) for the amplitude. fn and an correspond to the n-harmonic frequency and amplitude values. Total harmonic distortion (THD), signal-to-noise ratio (SNR) and signal-noise ratio+distortion (SNR+D) are also obtained. Q is a quality factor for the signal.