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93 lines
2.7 KiB
93 lines
2.7 KiB
7 years ago
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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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#ifndef filter_moog_f32_h_
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#define filter_moog_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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#include "arm_math.h"
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class AudioFilterMoog_F32: public AudioStream_F32
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{
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float g;
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float q;
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float driv;
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float oct;
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float basef;
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float y_a;
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float y_b;
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float y_c;
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float y_d;
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float y_d_1;
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public:
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AudioFilterMoog_F32() : AudioStream_F32(2, inputQueueArray) {
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frequency(1000);
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resonance(1);
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drive(1);
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octave(1);
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y_a = 0;
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y_b = 0;
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y_c = 0;
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y_d = 0;
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y_d_1 = 0;
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}
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void frequency(float freq,bool setf=true) {
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if (freq < 20.0) freq = 20.0;
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else if (freq > AUDIO_SAMPLE_RATE_EXACT/2.5) freq = AUDIO_SAMPLE_RATE_EXACT/2.5;
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g = 1 - expf(-2 * tanf(2 * M_PI * freq/(2 * AUDIO_SAMPLE_RATE_EXACT)));
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// Serial.println(freq);
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if(setf)
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basef=freq;
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}
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void resonance(float qi) {
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if (qi < 0.7) qi = 0.7;
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else if (qi > 5.0) qi = 5.0;
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q=qi;
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}
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void octave(float n) {
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if (n < 0.0) n = 0.0;
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else if (n > 6.9999) n = 6.9999;
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oct=n;
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}
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void drive(float d) {
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if (d > 10.0f) d = 10.0f;
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if (d < 0.1f) d = 0.1f;
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driv = d;
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}
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virtual void update(void);
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private:
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void update_fixed(const float *in,float *lp);
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void update_variable(const float *in, const float *ctl, float *lp);
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audio_block_f32_t *inputQueueArray[2];
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};
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#endif
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