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1 /*
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2 * FeedbackOscillator.h
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3 *
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4 * Created on: June 8, 2014
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5 * Author: Andrew McPherson
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6 */
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7
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8 #ifndef FEEDBACKOSCILLATOR_H
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9 #define FEEDBACKOSCILLATOR_H
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10
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11 class FeedbackOscillator
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12 {
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13 public:
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14 FeedbackOscillator();
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15 ~FeedbackOscillator();
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16
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17 // Initialise the settings for the feedback oscillator
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18 void initialise(int maxTableSize, float hpfCutoffFrequency, float matrixSampleRate);
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19
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20 // Process one sample and store the output value
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21 // Returns the length of table to interpolate; or 0 if nothing to process further
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22 int process(float input, float *output);
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23
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24 float *wavetable() { return wavetableRead; }
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25
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26 private:
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27 float coeffs[3]; // Coefficients of first-order high-pass filter
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28 float lastInput; // last input sample for HPF
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29 float lastOutput; // last output sample of HPF
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30 bool triggered; // whether we are currently saving samples
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31 bool canTrigger; // whether we are able to begin saving samples
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32 int wavetableMaxLength; // how long the stored wavetable can be
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33 int sampleCount; // how many samples have elapsed
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34 int lastTriggerCount; // sample count when we last triggered
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35
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36 float *wavetable1, *wavetable2; // Two wavetables where we record samples
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37 float *wavetableRead, *wavetableWrite; // Pointers to the above wavetables
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38 int wavetableWritePointer; // Where we are currently writing
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39 };
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40
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41 #endif
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