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OpenAudio_ArduinoLibrary.h

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

filter_moog.cpp

@@ -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
+

filter_moog.h

@@ -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