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DragonSifu 7 years ago committed by GitHub
parent 4f7edfcc61
commit e8258cc0aa
  1. 1
      OpenAudio_ArduinoLibrary.h
  2. 105
      filter_moog.cpp
  3. 65
      filter_moog.h

@ -22,6 +22,7 @@
#include "play_queue_f32.h" #include "play_queue_f32.h"
#include "record_queue_f32.h" #include "record_queue_f32.h"
#include "filter_moog_f32.h" #include "filter_moog_f32.h"
#include "filter_moog.h"
#include "synth_pinknoise_f32.h" #include "synth_pinknoise_f32.h"
#include "synth_sine_f32.h" #include "synth_sine_f32.h"
#include "synth_waveform_F32.h" #include "synth_waveform_F32.h"

@ -0,0 +1,105 @@
/* Audio Library for Teensy 3.X
* Copyright (c) 2014, Paul Stoffregen, paul@pjrc.com
*
* Development of this audio library was funded by PJRC.COM, LLC by sales of
* Teensy and Audio Adaptor boards. Please support PJRC's efforts to develop
* open source software by purchasing Teensy or other PJRC products.
*
* 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.
*/
#include "filter_moog.h"
#if defined(KINETISK)
void AudioFilterMoog::update_fixed(const int16_t *in,int16_t *lp)
{
const float MAX_INT = 32678.0;
for (int i = 0; i < AUDIO_BLOCK_SAMPLES; i++) {
float cs = (float)in[i];
cs=cs/MAX_INT;
cs = tanhf(cs * driv);
y_a = y_a + g * (tanhf(cs - q * ((y_d_1 + y_d)/2) - tanhf(y_a)));
y_b = y_b + g * (tanhf(y_a) - tanhf(y_b));
y_c = y_c + g * (tanhf(y_b) - tanhf(y_c));
y_d_1 = y_d;
y_d = y_d + g * (tanhf(y_c) - tanhf(y_d));
cs=y_d*MAX_INT;
lp[i] = (int16_t)cs;
}
}
void AudioFilterMoog::update_variable(const int16_t *in,const int16_t *ctl, int16_t *lp)
{
const float MAX_INT = 32678.0;
int over=1;
float cs = (float)ctl[0];
cs=cs/MAX_INT;
float nf=basef*(exp2f(cs*oct));
// Serial.println(nf);
frequency(nf,false);
update_fixed(in,lp) ;
}
void AudioFilterMoog::update(void)
{
audio_block_t *input_block=NULL, *control_block=NULL;
audio_block_t *lowpass_block=NULL;
input_block = receiveReadOnly(0);
control_block = receiveReadOnly(1);
if (!input_block) {
if (control_block) release(control_block);
return;
}
lowpass_block = allocate();
if (!lowpass_block) {
release(input_block);
if (control_block) release(control_block);
return;
}
if (control_block) {
update_variable(input_block->data, control_block->data, lowpass_block->data);
release(control_block);
} else {
update_fixed(input_block->data, lowpass_block->data);
}
release(input_block);
transmit(lowpass_block, 0);
release(lowpass_block);
return;
}
#elif defined(KINETISL)
void AudioFilterMoog::update(void)
{
audio_block_t *block;
block = receiveReadOnly(0);
if (block) release(block);
block = receiveReadOnly(1);
if (block) release(block);
}
#endif

@ -0,0 +1,65 @@
#ifndef filter_moog_h_
#define filter_moog_h_
#include "Arduino.h"
#include "AudioStream.h"
#include "arm_math.h"
class AudioFilterMoog: public AudioStream
{
float g;
float q;
float driv;
float oct;
float basef;
float y_a;
float y_b;
float y_c;
float y_d;
float y_d_1;
public:
AudioFilterMoog() : AudioStream(2, inputQueueArray) {
frequency(1000);
resonance(1);
drive(1);
octave(1);
y_a = 0;
y_b = 0;
y_c = 0;
y_d = 0;
y_d_1 = 0;
}
void resonance(float qi) {
if (qi < 0.7) qi = 0.7;
else if (qi > 5.0) qi = 5.0;
q=qi;
}
void drive(float d) {
if (d > 10.0f) d = 10.0f;
if (d < 0.1f) d = 0.1f;
driv = d;
}
void octave(float n) {
if (n < 0.0) n = 0.0;
else if (n > 6.9999) n = 6.9999;
oct=n;
}
void frequency(float freq,bool setf=true) {
if (freq < 20.0) freq = 20.0;
else if (freq > AUDIO_SAMPLE_RATE_EXACT/2.5) freq = AUDIO_SAMPLE_RATE_EXACT/2.5;
g = 1 - expf(-2 * tanf(2 * M_PI * freq/(2 * AUDIO_SAMPLE_RATE_EXACT)));
if(setf)
basef=freq;
}
virtual void update(void);
private:
void update_fixed(const int16_t *in,int16_t *lp);
void update_variable(const int16_t *in, const int16_t *ctl, int16_t *lp);
audio_block_t *inputQueueArray[2];
};
#endif
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