Claudio Citterio / RomeLib

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LowpassFilter.h@0:df3d4b033d11, 2019-02-27 (annotated)

Committer:
cittecla
Date:
Wed Feb 27 15:14:27 2019 +0000
Revision:
0:df3d4b033d11
P1 finished

Who changed what in which revision?

UserRevisionLine numberNew contents of line
cittecla 0:df3d4b033d11 1 /*
cittecla 0:df3d4b033d11 2 * LowpassFilter.h
cittecla 0:df3d4b033d11 3 * Copyright (c) 2019, ZHAW
cittecla 0:df3d4b033d11 4 * All rights reserved.
cittecla 0:df3d4b033d11 5 */
cittecla 0:df3d4b033d11 6
cittecla 0:df3d4b033d11 7 #ifndef LOWPASS_FILTER_H_
cittecla 0:df3d4b033d11 8 #define LOWPASS_FILTER_H_
cittecla 0:df3d4b033d11 9
cittecla 0:df3d4b033d11 10 #include <cstdlib>
cittecla 0:df3d4b033d11 11
cittecla 0:df3d4b033d11 12 /**
cittecla 0:df3d4b033d11 13 * This class implements a time-discrete 2nd order lowpass filter for a series of data values.
cittecla 0:df3d4b033d11 14 * This filter can typically be used within a periodic task that takes measurements that need
cittecla 0:df3d4b033d11 15 * to be filtered, like speed or position values.
cittecla 0:df3d4b033d11 16 */
cittecla 0:df3d4b033d11 17 class LowpassFilter {
cittecla 0:df3d4b033d11 18
cittecla 0:df3d4b033d11 19 public:
cittecla 0:df3d4b033d11 20
cittecla 0:df3d4b033d11 21 LowpassFilter();
cittecla 0:df3d4b033d11 22 virtual ~LowpassFilter();
cittecla 0:df3d4b033d11 23 void reset();
cittecla 0:df3d4b033d11 24 void reset(float value);
cittecla 0:df3d4b033d11 25 void setPeriod(float period);
cittecla 0:df3d4b033d11 26 void setFrequency(float frequency);
cittecla 0:df3d4b033d11 27 float getFrequency();
cittecla 0:df3d4b033d11 28 float filter(float value);
cittecla 0:df3d4b033d11 29
cittecla 0:df3d4b033d11 30 private:
cittecla 0:df3d4b033d11 31
cittecla 0:df3d4b033d11 32 float period;
cittecla 0:df3d4b033d11 33 float frequency;
cittecla 0:df3d4b033d11 34 float a11, a12, a21, a22, b1, b2;
cittecla 0:df3d4b033d11 35 float x1, x2;
cittecla 0:df3d4b033d11 36 };
cittecla 0:df3d4b033d11 37
cittecla 0:df3d4b033d11 38 #endif /* LOWPASS_FILTER_H_ */