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.
107 lines
3.3 KiB
107 lines
3.3 KiB
/* 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_f32.h"
|
|
|
|
|
|
|
|
#if defined(KINETISK)
|
|
|
|
void AudioFilterMoog_F32::update_fixed(const float *in,float *lp)
|
|
{
|
|
for (int i = 0; i < 2*AUDIO_BLOCK_SAMPLES; i++) {
|
|
float cs = tanhf(in[i/2] * 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));
|
|
lp[i/2] = y_d;
|
|
}
|
|
}
|
|
|
|
|
|
void AudioFilterMoog_F32::update_variable(const float *in,const float *ctl, float *lp)
|
|
{
|
|
int over=2;
|
|
float nf=basef*(exp2f(ctl[0/over]*oct));
|
|
frequency(nf,false);
|
|
for (int i = 0; i < 2*AUDIO_BLOCK_SAMPLES; i++) {
|
|
float cs = tanhf(in[i/over] * 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));
|
|
lp[i/over] = y_d;
|
|
}
|
|
}
|
|
|
|
|
|
void AudioFilterMoog_F32::update(void)
|
|
{
|
|
audio_block_f32_t *input_block=NULL, *control_block=NULL;
|
|
audio_block_f32_t *lowpass_block=NULL;
|
|
|
|
input_block = receiveReadOnly_f32(0);
|
|
control_block = receiveReadOnly_f32(1);
|
|
if (!input_block) {
|
|
if (control_block) release(control_block);
|
|
return;
|
|
}
|
|
lowpass_block = allocate_f32();
|
|
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);
|
|
}
|
|
AudioStream_F32::release(input_block);
|
|
AudioStream_F32::transmit(lowpass_block, 0);
|
|
AudioStream_F32::release(lowpass_block);
|
|
return;
|
|
}
|
|
|
|
#elif defined(KINETISL)
|
|
|
|
void AudioFilterMoog_F32::update(void)
|
|
{
|
|
audio_block_f32_t *block;
|
|
|
|
block = receiveReadOnly_f32(0);
|
|
if (block) AudioStream_F32::release(block);
|
|
block = receiveReadOnly_f32(1);
|
|
if (block) AudioStream_F32::release(block);
|
|
}
|
|
|
|
#endif
|
|
|
|
|