Ryo Od
/
NucleoF446_EnvelopeGenerator_AR
AR Envelope Generator
main.cpp@0:a08920b1cb6d, 2017-08-15 (annotated)
- Committer:
- ryood
- Date:
- Tue Aug 15 13:52:49 2017 +0000
- Revision:
- 0:a08920b1cb6d
AR Envelope Generator.
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
ryood | 0:a08920b1cb6d | 1 | /* |
ryood | 0:a08920b1cb6d | 2 | * Nucleo F446 内蔵DACでエンベロープ波形発生 |
ryood | 0:a08920b1cb6d | 3 | * |
ryood | 0:a08920b1cb6d | 4 | * 2017.08.14 |
ryood | 0:a08920b1cb6d | 5 | * |
ryood | 0:a08920b1cb6d | 6 | */ |
ryood | 0:a08920b1cb6d | 7 | |
ryood | 0:a08920b1cb6d | 8 | #include "mbed.h" |
ryood | 0:a08920b1cb6d | 9 | |
ryood | 0:a08920b1cb6d | 10 | #define UART_TRACE (0) |
ryood | 0:a08920b1cb6d | 11 | #define TITLE_STR1 ("Envelope Generator") |
ryood | 0:a08920b1cb6d | 12 | #define TITLE_STR2 ("20170814") |
ryood | 0:a08920b1cb6d | 13 | |
ryood | 0:a08920b1cb6d | 14 | #define PI_F (3.1415926f) |
ryood | 0:a08920b1cb6d | 15 | #define SAMPLING_RATE (48000) |
ryood | 0:a08920b1cb6d | 16 | #define SAMPLING_PERIOD (1.0f/SAMPLING_RATE) |
ryood | 0:a08920b1cb6d | 17 | #define ENVELOPE_UPDATE_RATE SAMPLING_RATE |
ryood | 0:a08920b1cb6d | 18 | |
ryood | 0:a08920b1cb6d | 19 | AnalogOut Dac1(PA_4); |
ryood | 0:a08920b1cb6d | 20 | |
ryood | 0:a08920b1cb6d | 21 | class EnvelopeAR |
ryood | 0:a08920b1cb6d | 22 | { |
ryood | 0:a08920b1cb6d | 23 | public: |
ryood | 0:a08920b1cb6d | 24 | EnvelopeAR(int _attack, int _release, float _v0, float _v1, float _v2, float _attackTauRatio=0.36f, float _releaseTauRatio=0.36f) : |
ryood | 0:a08920b1cb6d | 25 | amplitude(_v0), |
ryood | 0:a08920b1cb6d | 26 | v0(_v0), |
ryood | 0:a08920b1cb6d | 27 | v1(_v1), |
ryood | 0:a08920b1cb6d | 28 | v2(_v2), |
ryood | 0:a08920b1cb6d | 29 | vLast(_v0), |
ryood | 0:a08920b1cb6d | 30 | attackTauRatio(_attackTauRatio), |
ryood | 0:a08920b1cb6d | 31 | releaseTauRatio(_releaseTauRatio) { |
ryood | 0:a08920b1cb6d | 32 | setAttack(_attack); |
ryood | 0:a08920b1cb6d | 33 | setRelease(_release); |
ryood | 0:a08920b1cb6d | 34 | } |
ryood | 0:a08920b1cb6d | 35 | |
ryood | 0:a08920b1cb6d | 36 | ~EnvelopeAR() {} |
ryood | 0:a08920b1cb6d | 37 | |
ryood | 0:a08920b1cb6d | 38 | void setAttack(int _attack) { |
ryood | 0:a08920b1cb6d | 39 | attack = _attack; |
ryood | 0:a08920b1cb6d | 40 | tau0 = attack * attackTauRatio; |
ryood | 0:a08920b1cb6d | 41 | } |
ryood | 0:a08920b1cb6d | 42 | int getAttack() { |
ryood | 0:a08920b1cb6d | 43 | return attack; |
ryood | 0:a08920b1cb6d | 44 | } |
ryood | 0:a08920b1cb6d | 45 | |
ryood | 0:a08920b1cb6d | 46 | void setRelease(int _release) { |
ryood | 0:a08920b1cb6d | 47 | release = _release; |
ryood | 0:a08920b1cb6d | 48 | tau1 = release * releaseTauRatio; |
ryood | 0:a08920b1cb6d | 49 | } |
ryood | 0:a08920b1cb6d | 50 | int getRelease() { |
ryood | 0:a08920b1cb6d | 51 | return release; |
ryood | 0:a08920b1cb6d | 52 | } |
ryood | 0:a08920b1cb6d | 53 | |
ryood | 0:a08920b1cb6d | 54 | void setAttackTauRatio(float _attackTauRatio) { |
ryood | 0:a08920b1cb6d | 55 | attackTauRatio = _attackTauRatio; |
ryood | 0:a08920b1cb6d | 56 | tau0 = attack * attackTauRatio; |
ryood | 0:a08920b1cb6d | 57 | } |
ryood | 0:a08920b1cb6d | 58 | float getAttackTauRatio() { |
ryood | 0:a08920b1cb6d | 59 | return attackTauRatio; |
ryood | 0:a08920b1cb6d | 60 | } |
ryood | 0:a08920b1cb6d | 61 | |
ryood | 0:a08920b1cb6d | 62 | void setReleaseTauRatio(float _releaseTauRatio) { |
ryood | 0:a08920b1cb6d | 63 | releaseTauRatio = _releaseTauRatio; |
ryood | 0:a08920b1cb6d | 64 | tau1 = release * releaseTauRatio; |
ryood | 0:a08920b1cb6d | 65 | } |
ryood | 0:a08920b1cb6d | 66 | float getReleaseTauRatio() { |
ryood | 0:a08920b1cb6d | 67 | return releaseTauRatio; |
ryood | 0:a08920b1cb6d | 68 | } |
ryood | 0:a08920b1cb6d | 69 | |
ryood | 0:a08920b1cb6d | 70 | float getTau0() { |
ryood | 0:a08920b1cb6d | 71 | return tau0; |
ryood | 0:a08920b1cb6d | 72 | } |
ryood | 0:a08920b1cb6d | 73 | float getTau1() { |
ryood | 0:a08920b1cb6d | 74 | return tau1; |
ryood | 0:a08920b1cb6d | 75 | } |
ryood | 0:a08920b1cb6d | 76 | |
ryood | 0:a08920b1cb6d | 77 | void setV0(float _v0) { |
ryood | 0:a08920b1cb6d | 78 | v0 = _v0; |
ryood | 0:a08920b1cb6d | 79 | } |
ryood | 0:a08920b1cb6d | 80 | float getV0() { |
ryood | 0:a08920b1cb6d | 81 | return v0; |
ryood | 0:a08920b1cb6d | 82 | } |
ryood | 0:a08920b1cb6d | 83 | void setV1(float _v1) { |
ryood | 0:a08920b1cb6d | 84 | v1 = _v1; |
ryood | 0:a08920b1cb6d | 85 | } |
ryood | 0:a08920b1cb6d | 86 | float getV1() { |
ryood | 0:a08920b1cb6d | 87 | return v1; |
ryood | 0:a08920b1cb6d | 88 | } |
ryood | 0:a08920b1cb6d | 89 | void setV2(float _v2) { |
ryood | 0:a08920b1cb6d | 90 | v2 = _v2; |
ryood | 0:a08920b1cb6d | 91 | } |
ryood | 0:a08920b1cb6d | 92 | float getV2() { |
ryood | 0:a08920b1cb6d | 93 | return v2; |
ryood | 0:a08920b1cb6d | 94 | } |
ryood | 0:a08920b1cb6d | 95 | |
ryood | 0:a08920b1cb6d | 96 | float getAmplitude() { |
ryood | 0:a08920b1cb6d | 97 | return amplitude; |
ryood | 0:a08920b1cb6d | 98 | } |
ryood | 0:a08920b1cb6d | 99 | float getAmplitude(int tick) { |
ryood | 0:a08920b1cb6d | 100 | if (tick < attack) { |
ryood | 0:a08920b1cb6d | 101 | // attackの処理 |
ryood | 0:a08920b1cb6d | 102 | amplitude = v0 + (v1 - v0) * (1 - expf(-(float)tick / tau0)); |
ryood | 0:a08920b1cb6d | 103 | vLast = amplitude; |
ryood | 0:a08920b1cb6d | 104 | } else { |
ryood | 0:a08920b1cb6d | 105 | // releaseの処理 |
ryood | 0:a08920b1cb6d | 106 | amplitude = (vLast - v2) * (expf(-(float)(tick - attack) / tau1)) + v2; |
ryood | 0:a08920b1cb6d | 107 | } |
ryood | 0:a08920b1cb6d | 108 | return amplitude; |
ryood | 0:a08920b1cb6d | 109 | } |
ryood | 0:a08920b1cb6d | 110 | |
ryood | 0:a08920b1cb6d | 111 | private: |
ryood | 0:a08920b1cb6d | 112 | int attack; |
ryood | 0:a08920b1cb6d | 113 | int release; |
ryood | 0:a08920b1cb6d | 114 | float amplitude; |
ryood | 0:a08920b1cb6d | 115 | float v0; |
ryood | 0:a08920b1cb6d | 116 | float v1; |
ryood | 0:a08920b1cb6d | 117 | float v2; |
ryood | 0:a08920b1cb6d | 118 | float vLast; |
ryood | 0:a08920b1cb6d | 119 | float tau0; |
ryood | 0:a08920b1cb6d | 120 | float tau1; |
ryood | 0:a08920b1cb6d | 121 | float attackTauRatio; |
ryood | 0:a08920b1cb6d | 122 | float releaseTauRatio; |
ryood | 0:a08920b1cb6d | 123 | }; |
ryood | 0:a08920b1cb6d | 124 | |
ryood | 0:a08920b1cb6d | 125 | //EnvelopeAR(int _attack, int _release, float _v0, float _v1, float _v2, float _attackTauRatio=0.36f, float _releaseTauRatio=0.36f) : |
ryood | 0:a08920b1cb6d | 126 | EnvelopeAR envelopeAmplitude(50, 200, 0.99f, 1.0f, 0.0f, 0.36f, 0.36f); |
ryood | 0:a08920b1cb6d | 127 | |
ryood | 0:a08920b1cb6d | 128 | volatile int envelopeTicks; |
ryood | 0:a08920b1cb6d | 129 | volatile int envelopeLength; |
ryood | 0:a08920b1cb6d | 130 | volatile float amplitude; |
ryood | 0:a08920b1cb6d | 131 | |
ryood | 0:a08920b1cb6d | 132 | int bpm; |
ryood | 0:a08920b1cb6d | 133 | |
ryood | 0:a08920b1cb6d | 134 | void generateEnvelope() |
ryood | 0:a08920b1cb6d | 135 | { |
ryood | 0:a08920b1cb6d | 136 | // Amplitude Envelope |
ryood | 0:a08920b1cb6d | 137 | amplitude = envelopeAmplitude.getAmplitude(envelopeTicks); |
ryood | 0:a08920b1cb6d | 138 | |
ryood | 0:a08920b1cb6d | 139 | #if UART_TRACE |
ryood | 0:a08920b1cb6d | 140 | printf("%8d\t%8d\t%f\r\n", envelopeLength, envelopeTicks, amplitude); |
ryood | 0:a08920b1cb6d | 141 | #endif |
ryood | 0:a08920b1cb6d | 142 | |
ryood | 0:a08920b1cb6d | 143 | Dac1.write(amplitude); |
ryood | 0:a08920b1cb6d | 144 | |
ryood | 0:a08920b1cb6d | 145 | envelopeTicks++; |
ryood | 0:a08920b1cb6d | 146 | if (envelopeTicks >= envelopeLength) { |
ryood | 0:a08920b1cb6d | 147 | envelopeTicks = 0; |
ryood | 0:a08920b1cb6d | 148 | } |
ryood | 0:a08920b1cb6d | 149 | } |
ryood | 0:a08920b1cb6d | 150 | |
ryood | 0:a08920b1cb6d | 151 | void update() |
ryood | 0:a08920b1cb6d | 152 | { |
ryood | 0:a08920b1cb6d | 153 | generateEnvelope(); |
ryood | 0:a08920b1cb6d | 154 | } |
ryood | 0:a08920b1cb6d | 155 | |
ryood | 0:a08920b1cb6d | 156 | //------------------------------------------------------------------------------ |
ryood | 0:a08920b1cb6d | 157 | // ここでパラメータを設定 |
ryood | 0:a08920b1cb6d | 158 | //------------------------------------------------------------------------------ |
ryood | 0:a08920b1cb6d | 159 | void setParams() |
ryood | 0:a08920b1cb6d | 160 | { |
ryood | 0:a08920b1cb6d | 161 | bpm = 120.0f; |
ryood | 0:a08920b1cb6d | 162 | |
ryood | 0:a08920b1cb6d | 163 | envelopeLength = 60 * ENVELOPE_UPDATE_RATE / bpm; |
ryood | 0:a08920b1cb6d | 164 | |
ryood | 0:a08920b1cb6d | 165 | envelopeAmplitude.setAttack(envelopeLength * 0.1f); |
ryood | 0:a08920b1cb6d | 166 | envelopeAmplitude.setRelease(envelopeLength * 0.6f); |
ryood | 0:a08920b1cb6d | 167 | envelopeAmplitude.setV0(0.99f); |
ryood | 0:a08920b1cb6d | 168 | envelopeAmplitude.setV1(1.0f); |
ryood | 0:a08920b1cb6d | 169 | envelopeAmplitude.setV2(0.0f); |
ryood | 0:a08920b1cb6d | 170 | envelopeAmplitude.setAttackTauRatio(0.36f); |
ryood | 0:a08920b1cb6d | 171 | envelopeAmplitude.setReleaseTauRatio(0.6f); |
ryood | 0:a08920b1cb6d | 172 | } |
ryood | 0:a08920b1cb6d | 173 | |
ryood | 0:a08920b1cb6d | 174 | int main() |
ryood | 0:a08920b1cb6d | 175 | { |
ryood | 0:a08920b1cb6d | 176 | #if UART_TRACE |
ryood | 0:a08920b1cb6d | 177 | printf("%s %s\r\n", TITLE_STR1, TITLE_STR2); |
ryood | 0:a08920b1cb6d | 178 | #endif |
ryood | 0:a08920b1cb6d | 179 | |
ryood | 0:a08920b1cb6d | 180 | setParams(); |
ryood | 0:a08920b1cb6d | 181 | envelopeTicks = 0; |
ryood | 0:a08920b1cb6d | 182 | |
ryood | 0:a08920b1cb6d | 183 | Ticker samplingTicker; |
ryood | 0:a08920b1cb6d | 184 | samplingTicker.attach(&update, SAMPLING_PERIOD); |
ryood | 0:a08920b1cb6d | 185 | |
ryood | 0:a08920b1cb6d | 186 | for (;;) {} |
ryood | 0:a08920b1cb6d | 187 | } |