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81 lines
3.3 KiB
81 lines
3.3 KiB
4 days ago
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/* synth_UniformWhiteNoise_F32.h --- New July 2025
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Generates a block of uniformly distributed, uncorrelated, white
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noise of a range of (-level, +level) as set by amplitude(level)
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with a default value of level = 0.0. This replaces the class
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synth_whitenoise_F32 and corrects the need for I16 memory as well
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providing output that uses the full F32 mantissa of 24-bits.
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Method is xor shift 64 credited to George Marsaglia. See
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https://en.wikipedia.org/wiki/Xorshift and
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https://forum.pjrc.com/index.php?threads/teensy-4-1-random-number-generator.61125
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post 13 by #Nominal Animal.
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Bob Larkin July 2025. Thanks #grrrr
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Derived from synth_whitenoise_F32 that was
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extended by: Chip Audette, OpenAudio, Feb 2017
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License: MIT License. Use at your own risk.
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*/
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/* Audio Library for Teensy 3.X
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* Copyright (c) 2014, Paul Stoffregen, paul@pjrc.com
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*
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* Development of this audio library was funded by PJRC.COM, LLC by sales of
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* Teensy and Audio Adaptor boards. Please support PJRC's efforts to develop
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* open source software by purchasing Teensy or other PJRC products.
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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 does not support Teensy LC (KINETISL). Teensy 3.x and 4.x OK. **
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// Execution time 15 uSec for 128 size block on T4.x. 12 of these are
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// the conversionfrom uint32_t to F32 with offset for DC=0.
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#ifndef synth_uniform_white_noise_f32_h_
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#define synth_uniform_white_noise_f32_h_
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#include "Arduino.h"
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#include "AudioStream_F32.h"
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#include "utility/dspinst.h"
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class AudioSynthUniformWhiteNoise_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:uniformwhitenoise //this line used for automatic generation of GUI node
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public:
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AudioSynthUniformWhiteNoise_F32() : AudioStream_F32(0, NULL) { setDefaultValues(); }
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AudioSynthUniformWhiteNoise_F32(const AudioSettings_F32 &settings) :
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AudioStream_F32(0, NULL) { setDefaultValues(); }
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void setDefaultValues(void) {
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level = 0.0f;
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rnState = 1ULL + instance_count++;
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}
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void amplitude(float nL) {
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if (nL < 0.0) nL = 0.0;
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level = nL;
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}
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virtual void update(void);
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private:
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float32_t level = 0.0f;
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uint64_t rnState;
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uint64_t instance_count=0ULL;
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};
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#endif
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