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