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1 /*
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2 *
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3 * Simple 1-Dimensional Waveguide
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4 *
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5 * Christian Heinrichs 04/2015
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6 *
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7 */
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8
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9 #ifndef WAVEGUIDE_H_
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10 #define WAVEGUIDE_H_
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11
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12 #include <cmath>
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13
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14 #ifndef WG_BUFFER_SIZE
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15 #define WG_BUFFER_SIZE 4096
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16 #endif
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17
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18 #ifndef FILTER_BUFFER_SIZE
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19 #define FILTER_BUFFER_SIZE 4
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20 #endif
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21
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22 #ifndef M_PI
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23 #define M_PI 3.14159265358979323846264338
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24 #endif
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25
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26 class Waveguide
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27 {
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28
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29 public:
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30
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31 Waveguide();
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32 void setup();
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33 float update(float in);
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34 void updateFilterCoeffs(float frequency);
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35 void setFrequency(float frequency);
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36
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37 private:
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38
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39 double _dt;
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40 float _periodInMilliseconds;
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41 int _periodInSamples;
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42
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43 float _buffer[WG_BUFFER_SIZE];
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44 int _readPtr;
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45
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46 float _filterBuffer_x[FILTER_BUFFER_SIZE];
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47 float _filterBuffer_y[FILTER_BUFFER_SIZE];
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48 float _hipBuffer_x[FILTER_BUFFER_SIZE];
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49 float _hipBuffer_y[FILTER_BUFFER_SIZE];
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50 int _filterReadPtr;
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51
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52 float b0_lp,b1_lp,b2_lp,a1_lp, a2_lp;
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53 float _lastY,_lastX;
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54
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55 };
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56
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57 #endif
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