From d6128309337f93967c95be07bd0a6297c65c359a Mon Sep 17 00:00:00 2001 From: Holger Wirtz Date: Tue, 17 Sep 2019 15:35:51 +0200 Subject: [PATCH] Adding a fixed biquad filter at the output of the modulated delay. --- MicroMDAEPiano.ino | 40 ++++++++++++++++++++++++++++------------ 1 file changed, 28 insertions(+), 12 deletions(-) diff --git a/MicroMDAEPiano.ino b/MicroMDAEPiano.ino index 93e07d4..17957a5 100644 --- a/MicroMDAEPiano.ino +++ b/MicroMDAEPiano.ino @@ -54,10 +54,12 @@ 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; +AudioMixer4 modchorus_fbk_mixer_r; +AudioMixer4 modchorus_fbk_mixer_l; +AudioFilterBiquad modchorus_filter_r; +AudioFilterBiquad modchorus_filter_l; AudioSynthWaveform modulator; AudioConnection patchCord0(queue_r, peak_r); AudioConnection patchCord1(queue_l, peak_l); @@ -74,20 +76,22 @@ 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); -AudioConnection patchCord18(freeverb_l, 0, mixer_l, 1); -AudioConnection patchCord19(mixer_r, volume_r); -AudioConnection patchCord20(mixer_l, volume_l); +AudioConnection patchCord15(modchorus_r, modchorus_filter_r); +AudioConnection patchCord16(modchorus_l, modchorus_filter_l); +AudioConnection patchCord17(modchorus_filter_r, 0, mixer_r, 2); +AudioConnection patchCord18(modchorus_filter_l, 0, mixer_l, 2); +AudioConnection patchCord19(freeverb_r, 0, mixer_r, 1); +AudioConnection patchCord20(freeverb_l, 0, mixer_l, 1); +AudioConnection patchCord21(mixer_r, volume_r); +AudioConnection patchCord22(mixer_l, volume_l); #ifdef USB_AUDIO AudioOutputUSB usb1; -AudioConnection patchCord21(volume_r, 0, usb1, 0); -AudioConnection patchCord22(volume_l, 0, usb1, 1); +AudioConnection patchCord23(volume_r, 0, usb1, 0); +AudioConnection patchCord24(volume_l, 0, usb1, 1); #endif AudioOutputI2S i2s1; -AudioConnection patchCord23(volume_r, 0, i2s1, 0); -AudioConnection patchCord24(volume_l, 0, i2s1, 1); +AudioConnection patchCord25(volume_r, 0, i2s1, 0); +AudioConnection patchCord26(volume_l, 0, i2s1, 1); AudioControlSGTL5000 sgtl5000_1; // Objects @@ -248,6 +252,18 @@ void setup() #endif modchorus_r.offset(15.0); modchorus_l.offset(15.0); + // Butterworth filter, 12 db/octave + modchorus_filter_r.setLowpass(0, 6000, 0.707); + modchorus_filter_l.setLowpass(0, 6000, 0.707); + // Linkwitz-Riley filter, 48 dB/octave + //modchorus_filter_r.setLowpass(0, 6000, 0.54); + //modchorus_filter_r.setLowpass(1, 6000, 1.3); + //modchorus_filter_r.setLowpass(2, 6000, 0.54); + //modchorus_filter_r.setLowpass(3, 6000, 1.3); + //modchorus_filter_l.setLowpass(0, 6000, 0.54); + //modchorus_filter_l.setLowpass(1, 6000, 1.3); + //modchorus_filter_l.setLowpass(2, 6000, 0.54); + //modchorus_filter_l.setLowpass(3, 6000, 1.3); modchorus_fbk_mixer_r.gain(0, 1.0); modchorus_fbk_mixer_l.gain(0, 1.0); modchorus_fbk_mixer_r.gain(1, 0.0);