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Reverb system using parallel structure of comb filters and cascade structure of allpass filters for ST Nucleo F401RE.
Dependencies: UITDSP_ADDA mbed
main.cpp
- Committer:
- MikamiUitOpen
- Date:
- 2015-07-25
- Revision:
- 5:3568300a78d8
- Parent:
- 3:c0d8eec43a4e
File content as of revision 5:3568300a78d8:
//-------------------------------------------------------------- // Reverb system using comb filter and allpass filter // sw number = even : No reverb // sw number = odd : Reverb // 2015/07/25, Copyright (c) 2015 MIKAMI, Naoki //-------------------------------------------------------------- #include "ADC_BuiltIn.hpp" // for ADC not using interrupt #include "DAC_MCP4921.hpp" // for DAC MCP4921, MCP4922 #include "reverb_unit.hpp" using namespace Mikami; const int FS_ = 12000; // Sampling frequency: 12 kHz ADC_BuiltIn adc_(A0, FS_); // for AD DAC_MCP4921 myDac_; // for DA const float G_C_ = 0.8f; const float G_A_ = 0.6f; const float G0_ = 1.0f - G_C_; CombFilter<887> cm1(G_C_); CombFilter<1153> cm2(G_C_); CombFilter<1499> cm3(G_C_); AllpassFilter<97> ap1(G_A_); AllpassFilter<131> ap2(G_A_); DigitalIn sw_(D2, PullDown); int main() { myDac_.ScfClockTim3(500000); // cutoff frequency: 5 kHz while (true) { float xn = adc_.Read(); // Read from A0 //----------------------------------------------- xn = G0_*xn; // parallel part using comb filters float yn = cm1.Execute(xn) + cm2.Execute(xn) + cm3.Execute(xn); // cascade part using allpass filters yn = ap2.Execute(ap1.Execute(yn)); // add direct input signal yn = yn + xn; if (sw_.read() == 0) yn = xn; // no reverb //----------------------------------------------- myDac_.Write(yn); // Write to DAC } }