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| theme: jekyll-theme-tactile |
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@@ -162,4 +162,4 @@ void Biquad::calcBiquad(void) { | |
| } | ||
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| return; | ||
| } | ||
| } | ||
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| // | ||
| // DSPUtilities.cpp | ||
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| // | ||
| // | ||
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| #include "DSPUtilities.h" | ||
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| #ifndef DSP_UTILITIES | ||
| #define DSP_UTILITIES | ||
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| #include <cmath> | ||
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| //============================================================================== | ||
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| // Calculates the frequency of a given pitch (MIDI) value. | ||
| double pitchToFreq(double pitch) | ||
| { | ||
| return pow(2, (pitch - 69) / 12) * 440; | ||
| } | ||
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| //============================================================================== | ||
| // Calculates the pitch (MIDI) of a given frequency value | ||
| double freqToPitch(double freq) | ||
| { | ||
| return 69 + 12 * log2(freq / 440); | ||
| } | ||
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| //============================================================================== | ||
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| /** | ||
| Takes a value as input and clips it according to the min and max values. | ||
| Returns the input if (minValue <= in <= maxValue). | ||
| If (in < minValue), then return minValue. | ||
| If (in > maxValue), then return maxValue. | ||
| */ | ||
| double clipMinMax(double in, double minValue, double maxValue) | ||
| { | ||
| if (in < minValue) | ||
| return minValue; | ||
| else if (in > maxValue) | ||
| return maxValue; | ||
| else | ||
| return in; | ||
| } | ||
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| //============================================================================== | ||
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| /** | ||
| Takes a value as input and clips it according to the min value. | ||
| Returns the input if (minValue <= in). | ||
| If (in < minValue), then return minValue. | ||
| */ | ||
| double clipMin(double in, double minValue) | ||
| { | ||
| if (in < minValue) | ||
| return minValue; | ||
| else | ||
| return in; | ||
| } | ||
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| //============================================================================== | ||
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| /** | ||
| Crossfades linearly between two values (in0, in1). The value returned is | ||
| determined by the value of the xFadeCtrl argument. | ||
| xFadeCtrl Range: 0->1 | ||
| - xFadeCtrl = 0 (only in0 comes through) | ||
| - xFadeCtrl = 0.5 (equal mix of in0 and in1) | ||
| - xfadeCtrl = 1 (only in1 comes through) | ||
| */ | ||
| double xFadeLin(double xFadeCtrl, double in0, double in1) | ||
| { | ||
| // Clip the xFade parameter to only have range of 0->1 | ||
| xFadeCtrl = clipMinMax(xFadeCtrl, 0.0, 1.0); | ||
| // Perform crossfading and return the value | ||
| return (in0 * (1.0 - xFadeCtrl) + in1 * xFadeCtrl); | ||
| } | ||
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| //============================================================================== | ||
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| /** | ||
| Parabolic Controller Shaper: | ||
| "Bends" the controller curve torwards the X or Y axis. | ||
| input range: (-1..0..1) maps to output range: (-1..0..1). | ||
| bend range: (-1..0..1) | ||
| - bend = -1 (max bend towards X axis) | ||
| - bend = 0 (don't bend) | ||
| - bend = 1 (max bend towards Y axis) | ||
| */ | ||
| double parCtrlShaper(double input, double bend) | ||
| { | ||
| // clip input and bend because the shaper only works in that range. | ||
| input = clipMinMax(input, -1.0, 1.0); | ||
| bend = clipMinMax(bend, -1.0, 1.0); | ||
| return input * ((bend + 1) - fabs(input) * bend); | ||
| } | ||
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| //============================================================================== | ||
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| /** | ||
| Normalizes a range of values to the range 0->1. | ||
| (start/end should probably be the range of a parameter) | ||
| - input: the value to be normalized | ||
| - start: the start of the input's range | ||
| - end: the end of the input's range | ||
| Note: (start < end) and (start > end) are both valid. | ||
| */ | ||
| double normalizeRange(double input, double start, double end) | ||
| { | ||
| return (input - start) / (end - start); | ||
| } | ||
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| double resonanceToQ(double resonance) | ||
| { | ||
| return 1.0 / (2.0 * (1.0 - resonance)); | ||
| } | ||
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| //============================================================================== | ||
| #endif // DSP_UTILITIES | ||
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