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MicroMDAEPiano
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Fixed initial modulated delay offset when loading a sound.

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Removed modulated_delay internal feedback loop and added an "external" feedback lopp with a mixer.
dev
Holger Wirtz 5 years ago
parent 9c3dcb17d5
commit 7c93f655a9
5 changed files with 38 additions and 28 deletions
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  1. 32
      MicroMDAEPiano.ino
  2. 13
      UI.hpp
  3. 4
      config.h
  4. 14
      effect_modulated_delay.cpp
  5. 3
      effect_modulated_delay.h

32
MicroMDAEPiano.ino
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@ -54,6 +54,8 @@ AudioMixer4 mixer_l;
AudioAmplifier volume_r;
AudioAmplifier volume_l;
AudioAmplifier inverter;
AudioMixer4 modchorus_fbk_mixer_r;
AudioMixer4 modchorus_fbk_mixer_l;
AudioEffectModulatedDelay modchorus_r;
AudioEffectModulatedDelay modchorus_l;
AudioSynthWaveform modulator;
@ -61,13 +63,17 @@ AudioConnection patchCord0(queue_r, peak_r);
AudioConnection patchCord1(queue_l, peak_l);
AudioConnection patchCord2(queue_r, freeverb_r);
AudioConnection patchCord3(queue_l, freeverb_l);
AudioConnection patchCord4(queue_r, 0, modchorus_r, 0);
AudioConnection patchCord5(queue_l, 0, modchorus_l, 0);
AudioConnection patchCord8(modulator, 0, modchorus_r, 1);
AudioConnection patchCord9(modulator, inverter);
AudioConnection patchCord10(inverter, 0, modchorus_l, 1);
AudioConnection patchCord11(queue_r, 0, mixer_r, 0);
AudioConnection patchCord12(queue_l, 0, mixer_l, 0);
AudioConnection patchCord4(queue_r, 0, modchorus_fbk_mixer_r, 0);
AudioConnection patchCord5(queue_l, 0, modchorus_fbk_mixer_l, 0);
AudioConnection patchCord6(modchorus_fbk_mixer_r, 0, modchorus_r, 0);
AudioConnection patchCord7(modchorus_fbk_mixer_l, 0, modchorus_l, 0);
AudioConnection patchCord8(modchorus_r, 0, modchorus_r, 1);
AudioConnection patchCord9(modchorus_l, 0, modchorus_l, 1);
AudioConnection patchCord10(modulator, 0, modchorus_r, 1);
AudioConnection patchCord11(modulator, inverter);
AudioConnection patchCord12(inverter, 0, modchorus_l, 1);
AudioConnection patchCord13(queue_r, 0, mixer_r, 0);
AudioConnection patchCord14(queue_l, 0, mixer_l, 0);
AudioConnection patchCord15(modchorus_r, 0, mixer_r, 2);
AudioConnection patchCord16(modchorus_l, 0, mixer_l, 2);
AudioConnection patchCord17(freeverb_r, 0, mixer_r, 1);
@ -235,11 +241,19 @@ void setup()
modulator.phase(0);
modulator.amplitude(1.0);
modulator.offset(0.0);
#ifdef MOD_STEREO
inverter.gain(-1.0); // change phase for second modulated delay (faked stereo mode)
#else
inverter.gain(1.0);
#endif
modchorus_r.offset(15.0);
modchorus_l.offset(15.0);
modchorus_r.feedback(0.25);
modchorus_l.feedback(0.25);
//modchorus_r.feedback(0.25);
//modchorus_l.feedback(0.25);
modchorus_fbk_mixer_r.gain(0, 0.75);
modchorus_fbk_mixer_l.gain(0, 0.75);
modchorus_fbk_mixer_r.gain(1, 0.25);
modchorus_fbk_mixer_l.gain(1, 0.25);
// internal mixing of original signal(0), reverb(1) and chorus(2)
mixer_r.gain(VOL_MAIN, 0.5);

13
UI.hpp
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@ -126,6 +126,8 @@ extern AudioEffectFreeverb freeverb_l;
extern AudioSynthWaveform modulator;
extern AudioEffectModulatedDelay modchorus_r;
extern AudioEffectModulatedDelay modchorus_l;
extern AudioMixer4 modchorus_fbk_mixer_r;
extern AudioMixer4 modchorus_fbk_mixer_l;
extern AudioMixer4 mixer_r;
extern AudioMixer4 mixer_l;
extern AudioAmplifier volume_r;
@ -2206,8 +2208,13 @@ void set_chorus_feedback(uint8_t value)
Serial.print(F("Set CHORUS_FEEDBACK "));
Serial.println(value);
#endif
modchorus_r.feedback(mapfloat(float(value), ENC_CHORUS_FEEDBACK_MIN, ENC_CHORUS_FEEDBACK_MAX, 0.0, 1.0));
modchorus_l.feedback(mapfloat(float(value), ENC_CHORUS_FEEDBACK_MIN, ENC_CHORUS_FEEDBACK_MAX, 0.0, 1.0));
//modchorus_r.feedback(mapfloat(float(value), ENC_CHORUS_FEEDBACK_MIN, ENC_CHORUS_FEEDBACK_MAX, 0.0, 1.0));
//modchorus_l.feedback(mapfloat(float(value), ENC_CHORUS_FEEDBACK_MIN, ENC_CHORUS_FEEDBACK_MAX, 0.0, 1.0));
float tmp = mapfloat(float(value), ENC_CHORUS_FEEDBACK_MIN, ENC_CHORUS_FEEDBACK_MAX, 0.0, 0.5);
modchorus_fbk_mixer_r.gain(0, 1.0 - tmp);
modchorus_fbk_mixer_l.gain(0, 1.0 - tmp);
modchorus_fbk_mixer_r.gain(1, tmp);
modchorus_fbk_mixer_l.gain(1, tmp);
configuration.chorus_feedback = value;
}
@ -2630,7 +2637,7 @@ void handle_ui(void)
if (encoder_tmp != encoder_value[RIGHT_ENCODER])
{
// value up/down
set_chorus_delay(encoder_tmp);
set_chorus_delay(encoder_tmp / 10);
menu_system.update();
}
}

4
config.h
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@ -30,6 +30,9 @@
// ATTENTION! For better latency you have to redefine AUDIO_BLOCK_SAMPLES from
// 128 to 64 in <ARDUINO-IDE-DIR>/cores/teensy3/AudioStream.h
// arecord -f cd -Dhw:1,0 /tmp/bla.wav
// aplaymidi -p 20:0 test.mid
//*************************************************************************************************
//* DEVICE SETTINGS
//*************************************************************************************************
@ -57,6 +60,7 @@
// CHORUS parameters
#define CHORUS_DELAY_LENGTH_SAMPLES (16*AUDIO_BLOCK_SAMPLES) // one AUDIO_BLOCK_SAMPLES = 2.902ms
#define WAVEFORM_MOD WAVEFORM_TRIANGLE // WAVEFORM_SINE WAVEFORM_TRIANGLE WAVEFORM_SAWTOOTH WAVEFORM_SAWTOOTH_REVERSE
//#define MOD_STEREO 1
//*************************************************************************************************
//* DEBUG OUTPUT SETTINGS
//*************************************************************************************************

14
effect_modulated_delay.cpp
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@ -51,8 +51,6 @@ boolean AudioEffectModulatedDelay::begin(short *delayline, int d_length)
_delay_length = 0;
_delay_offset = 0.0;
_cb_index = 0;
_feedback = 0.0;
_feedback_value = 0;
if (delayline == NULL) {
return (false);
@ -82,16 +80,6 @@ float AudioEffectModulatedDelay::offset(float offset_value) // in ms
return (floor(offset_frames / AUDIO_SAMPLE_RATE * 1000));
}
void AudioEffectModulatedDelay::feedback(float feedback_level)
{
if (feedback_level < 0.0)
feedback_level = 0.0;
else if (feedback_level > 1.0)
feedback_level = 1.0;
_feedback = feedback_level / 2;
}
void AudioEffectModulatedDelay::update(void)
{
audio_block_t *block;
@ -122,7 +110,7 @@ void AudioEffectModulatedDelay::update(void)
// write data into circular buffer (delayline)
if (_cb_index >= _delay_length)
_cb_index = 0;
_delayline[_cb_index] = (*bp * (1.0 - _feedback)) + (_feedback_value * _feedback);
_delayline[_cb_index] = *bp;
// calculate the modulation-index as a floating point number for interpolation
mod_index = *mp * MODULATION_MAX_FACTOR * _delay_length;

3
effect_modulated_delay.h
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@ -45,7 +45,6 @@ class AudioEffectModulatedDelay :
boolean begin(short *delayline, int delay_length);
virtual void update(void);
virtual float offset(float offset_value);
virtual void feedback(float feedback_value);
private:
void set_modulator_filter_coeffs(void);
@ -54,8 +53,6 @@ class AudioEffectModulatedDelay :
uint16_t _cb_index; // current write pointer of the circular buffer
uint16_t _delay_offset; // number of samples for the read offset of the modulation inside the circular buffer
uint16_t _delay_length; // calculated number of samples of the delay
float32_t _feedback;
int16_t _feedback_value;
int16_t cb_mod_index; // current read pointer with modulation for the circular buffer
};

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