HAND
MAX30100_Filters.h
- Committer:
- condato_mbed
- Date:
- 2021-11-03
- Revision:
- 1:a9cc51956082
- Parent:
- 0:010b908e2187
File content as of revision 1:a9cc51956082:
/* Arduino-MAX30100 oximetry / heart rate integrated sensor library Copyright (C) 2016 OXullo Intersecans <x@brainrapers.org> This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. */ #ifndef MAX30100_FILTERS_H #define MAX30100_FILTERS_H // http://www.schwietering.com/jayduino/filtuino/ // Low pass butterworth filter order=1 alpha1=0.1 // Fs=100Hz, Fc=6Hz class FilterBuLp1 { public: FilterBuLp1() { v[0]=0.0; } private: float v[2]; public: float step(float x) //class II { v[0] = v[1]; v[1] = (2.452372752527856026e-1 * x) + (0.50952544949442879485 * v[0]); return (v[0] + v[1]); } }; // http://sam-koblenski.blogspot.de/2015/11/everyday-dsp-for-programmers-dc-and.html class DCRemover { public: DCRemover() : alpha(0), dcw(0) { } DCRemover(float alpha_) : alpha(alpha_), dcw(0) { } float step(float x) { float olddcw = dcw; dcw = (float)x + alpha * dcw; return dcw - olddcw; } float getDCW() { return dcw; } private: float alpha; float dcw; }; #endif