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OpenAudio_ArduinoLibrary/synth_GaussianWhiteNoise_F32.h

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/*
* synth_GaussianWhiteNoise_F32.h
* W7PUA 15 June 2020
*
* Thanks to PJRC and Pau Stoffregen for the Teensy processor, Teensyduino
* and Teensy Audio. Thanks to Chip Audette for the F32 extension
* work. Alll of that makes this possible. Bob
*
* Copyright (c) 2020 Bob Larkin
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice, development funding notice, and this permission
* notice shall be included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
/* This noise source is very close to a Gaussian distribution with mean of
* zero and a standard deviation specified by amplitude(). Default amlitude
* is 0.0 (off). Time requirements:
* For generating a block of 128, Teensy 3.6, 121 microseconds
* For generating a block of 128, Teensy 4.0, 36 microseconds
*/
#ifndef synth_GaussianWhiteNoise_f32_h_
#define synth_GaussianWhiteNoise_f32_h_
#include "Arduino.h"
#include "AudioStream_F32.h"
// Temporary timing test
#define TEST_TIME_GWN 0
#define FL_ONE 0X3F800000
#define FL_MASK 0X007FFFFF
class AudioSynthGaussian_F32 : public AudioStream_F32
{
//GUI: inputs:0, outputs:1 //this line used for automatic generation of GUI node
//GUI: shortName:Gaussianwhitenoise //this line used for automatic generation of GUI node
public:
AudioSynthGaussian_F32() : AudioStream_F32(0, NULL) { }
// Allow for changing block size?
AudioSynthGaussian_F32(const AudioSettings_F32 &settings) : AudioStream_F32(0, NULL) { }
// Gaussian amplitude is specified by the 1-sigma (standard deviation) value.
// sd=0.0 is un-enabled.
void amplitude(float _sd) {
sd = _sd; // Enduring copy
if (sd<0.0) sd=0.0;
}
// Add printError(uint16_t e) - not currently used.
virtual void update(void);
private:
uint16_t blockSize = AUDIO_BLOCK_SAMPLES;
uint32_t idum = 12345;
float32_t sd = 0.0; // Default to off
uint16_t errorPrint = 0;
// *Temporary* - TEST_TIME allows measuring time in microseconds for each part of the update()
#if TEST_TIME_GWN
elapsedMicros tElapse;
int32_t iitt = 999000; // count up to a million during startup
#endif
};
#endif