You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
77 lines
3.0 KiB
77 lines
3.0 KiB
5 years ago
|
/*
|
||
|
|
* 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
|