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Finish Noise. Finish Random except TRIG input.

tags/v1.3.0
Andrew Belt 4 years ago
parent
7a4d7dac43
commit
9630825950
8 changed files with 2273 additions and 28 deletions
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  1. +3
    -1
      CHANGELOG.md
  2. +16
    -0
      plugin.json
  3. +327
    -0
      res/Noise.svg
  4. +1483
    -0
      res/Random.svg
  5. +231
    -0
      src/Noise.cpp
  6. +182
    -0
      src/Random.cpp
  7. +4
    -2
      src/plugin.cpp
  8. +27
    -25
      src/plugin.hpp

+ 3
- 1
CHANGELOG.md View File

@@ -1,5 +1,7 @@
### ??? (in development)
### 1.3.0 (in development)
- Add Random and Noise modules.
- Make VCA-1 display polyphonic CV.
- Add VU meters to level sliders in Mixer.

### 1.2.1 (2019-08-10)
- Fix VCO hard sync bug, resulting in aliasing.


+ 16
- 0
plugin.json View File

@@ -228,6 +228,22 @@
"Quantizer",
"Polyphonic"
]
},
{
"slug": "Random",
"name": "Random",
"description": "Random CV generator",
"tags": [
"Random"
]
},
{
"slug": "Noise",
"name": "Noise",
"description": "Multicolored noise generator",
"tags": [
"Noise"
]
}
]
}

+ 327
- 0
res/Noise.svg View File

@@ -0,0 +1,327 @@
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res/Random.svg
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src/Noise.cpp View File

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#include "plugin.hpp"


/** Based on "The Voss algorithm"
http://www.firstpr.com.au/dsp/pink-noise/
*/
template <int QUALITY = 8>
struct PinkNoiseGenerator {
int frame = -1;
float values[QUALITY] = {};

float process() {
int lastFrame = frame;
frame++;
if (frame >= (1 << QUALITY))
frame = 0;
int diff = lastFrame ^ frame;

float sum = 0.f;
for (int i = 0; i < QUALITY; i++) {
if (diff & (1 << i)) {
values[i] = random::uniform() - 0.5f;
}
sum += values[i];
}
return sum;
}
};


/**
a_0 is normalized to 1 and omitted from the `a` array, so its indices are shifted down by 1.
*/
template <int B_ORDER, int A_ORDER>
struct IIRFilter {
float b[B_ORDER] = {};
float a[A_ORDER - 1] = {};
float xState[B_ORDER] = {};
float yState[A_ORDER - 1] = {};

void setCoefficients(const float* b, const float* a) {
for (int i = 0; i < B_ORDER; i++) {
this->b[i] = b[i];
}
for (int i = 1; i < A_ORDER; i++) {
this->a[i - 1] = a[i - 1];
}
}

float process(float x) {
// Shift x state
for (int i = B_ORDER - 1; i >= 1; i--) {
xState[i] = xState[i - 1];
}
xState[0] = x;

float y = 0.f;
// Add x state
for (int i = 0; i < B_ORDER; i++) {
y += b[i] * xState[i];
}
// Subtract y state
for (int i = 1; i < A_ORDER; i++) {
y -= a[i - 1] * yState[i - 1];
}
// Shift y state
for (int i = A_ORDER - 1; i >= 2; i--) {
yState[i - 1] = yState[i - 2];
}
yState[0] = y;
return y;
}
};


struct InverseAWeightingFFTFilter {
static constexpr int BUFFER_LEN = 1024;

alignas(16) float inputBuffer[BUFFER_LEN] = {};
alignas(16) float outputBuffer[BUFFER_LEN] = {};
int frame = 0;
dsp::RealFFT fft;

InverseAWeightingFFTFilter() : fft(BUFFER_LEN) {}

float process(float deltaTime, float x) {
inputBuffer[frame] = x;
if (++frame >= BUFFER_LEN) {
frame = 0;
alignas(16) float freqBuffer[BUFFER_LEN * 2];
fft.rfft(inputBuffer, freqBuffer);

for (int i = 0; i < BUFFER_LEN; i++) {
float f = 1 / deltaTime / 2 / BUFFER_LEN * i;
float amp = 0.f;
if (80.f <= f && f <= 20000.f) {
float f2 = f * f;
// Inverse A-weighted curve
amp = ((424.36f + f2) * std::sqrt((11599.3f + f2) * (544496.f + f2)) * (148693636.f + f2)) / (148693636.f * f2 * f2);
}
freqBuffer[2 * i + 0] *= amp / BUFFER_LEN;
freqBuffer[2 * i + 1] *= amp / BUFFER_LEN;
}

fft.irfft(freqBuffer, outputBuffer);
}
return outputBuffer[frame];
}
};




struct Noise : Module {
enum ParamIds {
NUM_PARAMS
};
enum InputIds {
NUM_INPUTS
};
enum OutputIds {
WHITE_OUTPUT,
PINK_OUTPUT,
RED_OUTPUT,
VIOLET_OUTPUT,
BLUE_OUTPUT,
GRAY_OUTPUT,
BLACK_OUTPUT,
NUM_OUTPUTS
};
enum LightIds {
NUM_LIGHTS
};

dsp::ClockDivider blackDivider;
PinkNoiseGenerator<8> pinkNoiseGenerator;
IIRFilter<2, 2> redFilter;
float lastWhite = 0.f;
float lastPink = 0.f;
InverseAWeightingFFTFilter grayFilter;

// For calibrating levels
// float meanSqr = 0.f;

Noise() {
config(NUM_PARAMS, NUM_INPUTS, NUM_OUTPUTS, NUM_LIGHTS);

// Hard-code coefficients for Butterworth lowpass with cutoff 20 Hz @ 44.1kHz.
const float b[] = {0.00425611, 0.00425611};
const float a[] = {-0.99148778};
redFilter.setCoefficients(b, a);
}

void process(const ProcessArgs& args) override {
// All noise is calibrated to 1 RMS.
// Then they should be scaled to match the RMS of a sine wave with 5V amplitude.
const float gain = 5.f / std::sqrt(2.f);

if (outputs[WHITE_OUTPUT].isConnected() || outputs[RED_OUTPUT].isConnected() || outputs[VIOLET_OUTPUT].isConnected() || outputs[GRAY_OUTPUT].isConnected()) {
// White noise: equal power density
float white = random::normal();
outputs[WHITE_OUTPUT].setVoltage(white * gain);

// Red/Brownian noise: -6dB/oct
if (outputs[RED_OUTPUT].isConnected()) {
float red = redFilter.process(white) / 0.0645f;
outputs[RED_OUTPUT].setVoltage(red * gain);
}

// Violet/purple noise: 6dB/oct
if (outputs[VIOLET_OUTPUT].isConnected()) {
float violet = (white - lastWhite) / 1.41f;
lastWhite = white;
outputs[VIOLET_OUTPUT].setVoltage(violet * gain);
}

// Gray noise: psychoacoustic equal loudness curve, specifically inverted A-weighted
if (outputs[GRAY_OUTPUT].isConnected()) {
float gray = grayFilter.process(args.sampleTime, white) / 1.67f;
outputs[GRAY_OUTPUT].setVoltage(gray * gain);
}
}

if (outputs[PINK_OUTPUT].isConnected() || outputs[BLUE_OUTPUT].isConnected()) {
// Pink noise: -3dB/oct
float pink = pinkNoiseGenerator.process() / 0.816f;
outputs[PINK_OUTPUT].setVoltage(pink * gain);

// Blue noise: 3dB/oct
if (outputs[BLUE_OUTPUT].isConnected()) {
float blue = (pink - lastPink) / 0.705f;
lastPink = pink;
outputs[BLUE_OUTPUT].setVoltage(blue * gain);
}
}

// Black noise: uniform noise
// Note: I made this definition up.
if (outputs[BLACK_OUTPUT].isConnected()) {
float u = random::uniform();
outputs[BLACK_OUTPUT].setVoltage(u * 10.f - 5.f);
}

// meanSqr += (std::pow(gray, 2.f) - meanSqr) * args.sampleTime / 10.f;
// DEBUG("%f", std::sqrt(meanSqr));
}
};


struct NoiseWidget : ModuleWidget {
NoiseWidget(Noise* module) {
setModule(module);
setPanel(APP->window->loadSvg(asset::plugin(pluginInstance, "res/Noise.svg")));

addChild(createWidget<ScrewSilver>(Vec(RACK_GRID_WIDTH, 0)));
addChild(createWidget<ScrewSilver>(Vec(box.size.x - 2 * RACK_GRID_WIDTH, 0)));
addChild(createWidget<ScrewSilver>(Vec(RACK_GRID_WIDTH, RACK_GRID_HEIGHT - RACK_GRID_WIDTH)));
addChild(createWidget<ScrewSilver>(Vec(box.size.x - 2 * RACK_GRID_WIDTH, RACK_GRID_HEIGHT - RACK_GRID_WIDTH)));

addOutput(createOutputCentered<PJ301MPort>(mm2px(Vec(7.621, 21.727)), module, Noise::WHITE_OUTPUT));
addOutput(createOutputCentered<PJ301MPort>(mm2px(Vec(7.621, 36.726)), module, Noise::PINK_OUTPUT));
addOutput(createOutputCentered<PJ301MPort>(mm2px(Vec(7.621, 51.727)), module, Noise::RED_OUTPUT));
addOutput(createOutputCentered<PJ301MPort>(mm2px(Vec(7.621, 66.727)), module, Noise::VIOLET_OUTPUT));
addOutput(createOutputCentered<PJ301MPort>(mm2px(Vec(7.621, 81.727)), module, Noise::BLUE_OUTPUT));
addOutput(createOutputCentered<PJ301MPort>(mm2px(Vec(7.621, 96.727)), module, Noise::GRAY_OUTPUT));
addOutput(createOutputCentered<PJ301MPort>(mm2px(Vec(7.621, 111.727)), module, Noise::BLACK_OUTPUT));
}
};


Model* modelNoise = createModel<Noise, NoiseWidget>("Noise");

+ 182
- 0
src/Random.cpp View File

@@ -0,0 +1,182 @@
#include "plugin.hpp"


struct Random : Module {
enum ParamIds {
RATE_PARAM,
SHAPE_PARAM,
OFFSET_PARAM,
RELATIVE_PARAM,
NUM_PARAMS
};
enum InputIds {
RATE_INPUT,
SHAPE_INPUT,
TRIGGER_INPUT,
EXTERNAL_INPUT,
NUM_INPUTS
};
enum OutputIds {
STEPPED_OUTPUT,
LINEAR_OUTPUT,
SMOOTH_OUTPUT,
EXPONENTIAL_OUTPUT,
NUM_OUTPUTS
};
enum LightIds {
RATE_LIGHT,
SHAPE_LIGHT,
NUM_LIGHTS
};

float lastValue = 0.f;
float value = 0.f;
float clockPhase = 0.f;

Random() {
config(NUM_PARAMS, NUM_INPUTS, NUM_OUTPUTS, NUM_LIGHTS);
configParam(RATE_PARAM, std::log2(0.001f), std::log2(1000.f), std::log2(2.f), "Rate", " Hz", 2);
configParam(SHAPE_PARAM, 0.f, 1.f, 0.f, "Shape", "%", 0, 100);
configParam(OFFSET_PARAM, 0.f, 1.f, 0.f, "Offset");
configParam(RELATIVE_PARAM, 0.f, 1.f, 0.f, "Quantize");
}

void process(const ProcessArgs& args) override {
// TODO TRIG input

// Clock
float rate = params[RATE_PARAM].getValue();
rate += inputs[RATE_PARAM].getVoltage();
float clockFreq = std::pow(2.f, rate);
float deltaPhase = std::fmin(clockFreq * args.sampleTime, 0.5f);
clockPhase += deltaPhase;
if (clockPhase >= 1.f) {
clockPhase -= 1.f;
lastValue = value;
if (inputs[EXTERNAL_INPUT].isConnected()) {
value = inputs[EXTERNAL_INPUT].getVoltage() / 10.f;
}
else {
// Choose a new random value
bool relative = params[RELATIVE_PARAM].getValue() > 0.f;
bool uni = params[OFFSET_PARAM].getValue() > 0.f;
if (relative) {
// Switch to uni if bi
if (!uni)
value += 0.5f;
float deltaValue = random::normal();
// Bias based on value
deltaValue -= (value - 0.5f) * 2.f;
// Scale delta and accumulate value
const float stdDev = 1 / 10.f;
deltaValue *= stdDev;
value += deltaValue;
value = clamp(value, 0.f, 1.f);
// Switch back to bi
if (!uni)
value -= 0.5f;
}
else {
value = random::uniform();
if (!uni)
value -= 0.5f;
}
}
lights[RATE_LIGHT].setBrightness(1.f);
}

// Shape
float shape = params[SHAPE_PARAM].getValue();
shape += inputs[SHAPE_INPUT].getVoltage() / 10.f;
shape = clamp(shape, 0.f, 1.f);

// Stepped
if (outputs[STEPPED_OUTPUT].isConnected()) {
float steps = std::floor(std::pow(shape + 1, 4));
float v = std::ceil(clockPhase * steps) / steps;
v = rescale(v, 0.f, 1.f, lastValue, value);
outputs[STEPPED_OUTPUT].setVoltage(v * 10.f);
}

// Linear
if (outputs[LINEAR_OUTPUT].isConnected()) {
float slope = 1 / (1 - shape);
float v;
if (slope < 1e6f) {
v = std::fmin(clockPhase * slope, 1.f);
}
else {
v = 1.f;
}
v = rescale(v, 0.f, 1.f, lastValue, value);
outputs[LINEAR_OUTPUT].setVoltage(v * 10.f);
}

// Exp
if (outputs[EXPONENTIAL_OUTPUT].isConnected()) {
float b = std::pow(1.f - shape, 4);
float v;
if (0.999f < b) {
v = clockPhase;
}
else if (1e-20f < b) {
v = (std::pow(b, clockPhase) - 1.f) / (b - 1.f);
}
else {
v = 1.f;
}
v = rescale(v, 0.f, 1.f, lastValue, value);
outputs[EXPONENTIAL_OUTPUT].setVoltage(v * 10.f);
}

// Smooth
if (outputs[SMOOTH_OUTPUT].isConnected()) {
float p = 1 / (1 - shape);
float v;
if (p < 1e6f) {
v = std::fmin(clockPhase * p, 1.f);
v = std::cos(M_PI * v);
}
else {
v = -1.f;
}
v = rescale(v, 1.f, -1.f, lastValue, value);
outputs[SMOOTH_OUTPUT].setVoltage(v * 10.f);
}

// Lights
lights[RATE_LIGHT].setSmoothBrightness(0.f, args.sampleTime);
lights[SHAPE_LIGHT].setBrightness(shape);
}
};


struct RandomWidget : ModuleWidget {
RandomWidget(Random* module) {
setModule(module);
setPanel(APP->window->loadSvg(asset::plugin(pluginInstance, "res/Random.svg")));

addChild(createWidget<ScrewSilver>(Vec(RACK_GRID_WIDTH, 0)));
addChild(createWidget<ScrewSilver>(Vec(box.size.x - 2 * RACK_GRID_WIDTH, 0)));
addChild(createWidget<ScrewSilver>(Vec(RACK_GRID_WIDTH, RACK_GRID_HEIGHT - RACK_GRID_WIDTH)));
addChild(createWidget<ScrewSilver>(Vec(box.size.x - 2 * RACK_GRID_WIDTH, RACK_GRID_HEIGHT - RACK_GRID_WIDTH)));

addParam(createLightParamCentered<LEDLightSlider<GreenLight>>(mm2px(Vec(7.215, 31.358)), module, Random::RATE_PARAM, Random::RATE_LIGHT));
addParam(createLightParamCentered<LEDLightSlider<GreenLight>>(mm2px(Vec(18.214, 31.358)), module, Random::SHAPE_PARAM, Random::SHAPE_LIGHT));
addParam(createParamCentered<CKSS>(mm2px(Vec(7.214, 78.498)), module, Random::OFFSET_PARAM));
addParam(createParamCentered<CKSS>(mm2px(Vec(18.214, 78.498)), module, Random::RELATIVE_PARAM));

addInput(createInputCentered<PJ301MPort>(mm2px(Vec(7.214, 51.227)), module, Random::RATE_INPUT));
addInput(createInputCentered<PJ301MPort>(mm2px(Vec(18.214, 51.227)), module, Random::SHAPE_INPUT));
addInput(createInputCentered<PJ301MPort>(mm2px(Vec(7.214, 64.763)), module, Random::TRIGGER_INPUT));
addInput(createInputCentered<PJ301MPort>(mm2px(Vec(18.214, 64.763)), module, Random::EXTERNAL_INPUT));

addOutput(createOutputCentered<PJ301MPort>(mm2px(Vec(7.214, 96.727)), module, Random::STEPPED_OUTPUT));
addOutput(createOutputCentered<PJ301MPort>(mm2px(Vec(18.214, 96.727)), module, Random::LINEAR_OUTPUT));
addOutput(createOutputCentered<PJ301MPort>(mm2px(Vec(7.214, 112.182)), module, Random::SMOOTH_OUTPUT));
addOutput(createOutputCentered<PJ301MPort>(mm2px(Vec(18.214, 112.182)), module, Random::EXPONENTIAL_OUTPUT));
}
};


Model* modelRandom = createModel<Random, RandomWidget>("Random");

+ 4
- 2
src/plugin.cpp View File

@@ -1,9 +1,9 @@
#include "plugin.hpp"


Plugin *pluginInstance;
Plugin* pluginInstance;

void init(rack::Plugin *p) {
void init(rack::Plugin* p) {
pluginInstance = p;

p->addModel(modelVCO);
@@ -25,6 +25,8 @@ void init(rack::Plugin *p) {
p->addModel(modelSequentialSwitch2);
p->addModel(modelOctave);
p->addModel(modelQuantizer);
p->addModel(modelRandom);
p->addModel(modelNoise);
p->addModel(modelSplit);
p->addModel(modelMerge);
p->addModel(modelSum);


+ 27
- 25
src/plugin.hpp View File

@@ -4,29 +4,31 @@
using namespace rack;


extern Plugin *pluginInstance;
extern Plugin* pluginInstance;

extern Model *modelVCO;
extern Model *modelVCO2;
extern Model *modelVCF;
extern Model *modelVCA_1;
extern Model *modelVCA;
extern Model *modelLFO;
extern Model *modelLFO2;
extern Model *modelDelay;
extern Model *modelADSR;
extern Model *modelVCMixer;
extern Model *model_8vert;
extern Model *modelUnity;
extern Model *modelMutes;
extern Model *modelScope;
extern Model *modelSEQ3;
extern Model *modelSequentialSwitch1;
extern Model *modelSequentialSwitch2;
extern Model *modelOctave;
extern Model *modelQuantizer;
extern Model *modelSplit;
extern Model *modelMerge;
extern Model *modelSum;
extern Model *modelViz;
extern Model *modelMidSide;
extern Model* modelVCO;
extern Model* modelVCO2;
extern Model* modelVCF;
extern Model* modelVCA_1;
extern Model* modelVCA;
extern Model* modelLFO;
extern Model* modelLFO2;
extern Model* modelDelay;
extern Model* modelADSR;
extern Model* modelVCMixer;
extern Model* model_8vert;
extern Model* modelUnity;
extern Model* modelMutes;
extern Model* modelScope;
extern Model* modelSEQ3;
extern Model* modelSequentialSwitch1;
extern Model* modelSequentialSwitch2;
extern Model* modelOctave;
extern Model* modelQuantizer;
extern Model* modelRandom;
extern Model* modelNoise;
extern Model* modelSplit;
extern Model* modelMerge;
extern Model* modelSum;
extern Model* modelViz;
extern Model* modelMidSide;

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