不韋 呂 / Mbed 2 deprecated UIT2_ReverbSystem

Reverb system using parallel structure of comb filters and cascade structure of allpass filters for ST Nucleo F401RE.

Dependencies:   UITDSP_ADDA mbed

main.cpp@5:3568300a78d8, 2015-07-25 (annotated)

Committer:
MikamiUitOpen
Date:
Sat Jul 25 07:22:14 2015 +0000
Revision:
5:3568300a78d8
Parent:
3:c0d8eec43a4e 
6

Who changed what in which revision?

UserRevisionLine numberNew contents of line
MikamiUitOpen 0:72e321f29769 1 //--------------------------------------------------------------
MikamiUitOpen 1:51c85e0a6e1e 2 // Reverb system using comb filter and allpass filter
MikamiUitOpen 5:3568300a78d8 3 // sw number = even : No reverb
MikamiUitOpen 5:3568300a78d8 4 // sw number = odd : Reverb
MikamiUitOpen 5:3568300a78d8 5 // 2015/07/25, Copyright (c) 2015 MIKAMI, Naoki
MikamiUitOpen 0:72e321f29769 6 //--------------------------------------------------------------
MikamiUitOpen 0:72e321f29769 7
MikamiUitOpen 5:3568300a78d8 8 #include "ADC_BuiltIn.hpp" // for ADC not using interrupt
MikamiUitOpen 5:3568300a78d8 9 #include "DAC_MCP4921.hpp" // for DAC MCP4921, MCP4922
MikamiUitOpen 0:72e321f29769 10 #include "reverb_unit.hpp"
MikamiUitOpen 0:72e321f29769 11
MikamiUitOpen 0:72e321f29769 12 using namespace Mikami;
MikamiUitOpen 0:72e321f29769 13
MikamiUitOpen 5:3568300a78d8 14 const int FS_ = 12000; // Sampling frequency: 12 kHz
MikamiUitOpen 5:3568300a78d8 15 ADC_BuiltIn adc_(A0, FS_); // for AD
MikamiUitOpen 5:3568300a78d8 16 DAC_MCP4921 myDac_; // for DA
MikamiUitOpen 0:72e321f29769 17
MikamiUitOpen 0:72e321f29769 18 const float G_C_ = 0.8f;
MikamiUitOpen 0:72e321f29769 19 const float G_A_ = 0.6f;
MikamiUitOpen 0:72e321f29769 20 const float G0_ = 1.0f - G_C_;
MikamiUitOpen 0:72e321f29769 21 CombFilter<887> cm1(G_C_);
MikamiUitOpen 0:72e321f29769 22 CombFilter<1153> cm2(G_C_);
MikamiUitOpen 0:72e321f29769 23 CombFilter<1499> cm3(G_C_);
MikamiUitOpen 0:72e321f29769 24 AllpassFilter<97> ap1(G_A_);
MikamiUitOpen 0:72e321f29769 25 AllpassFilter<131> ap2(G_A_);
MikamiUitOpen 0:72e321f29769 26
MikamiUitOpen 0:72e321f29769 27 DigitalIn sw_(D2, PullDown);
MikamiUitOpen 0:72e321f29769 28
MikamiUitOpen 0:72e321f29769 29 int main()
MikamiUitOpen 0:72e321f29769 30 {
MikamiUitOpen 3:c0d8eec43a4e 31 myDac_.ScfClockTim3(500000); // cutoff frequency: 5 kHz
MikamiUitOpen 0:72e321f29769 32
MikamiUitOpen 0:72e321f29769 33 while (true)
MikamiUitOpen 0:72e321f29769 34 {
MikamiUitOpen 0:72e321f29769 35 float xn = adc_.Read(); // Read from A0
MikamiUitOpen 0:72e321f29769 36 //-----------------------------------------------
MikamiUitOpen 0:72e321f29769 37
MikamiUitOpen 0:72e321f29769 38 xn = G0_*xn;
MikamiUitOpen 0:72e321f29769 39 // parallel part using comb filters
MikamiUitOpen 0:72e321f29769 40 float yn = cm1.Execute(xn) + cm2.Execute(xn)
MikamiUitOpen 0:72e321f29769 41 + cm3.Execute(xn);
MikamiUitOpen 0:72e321f29769 42 // cascade part using allpass filters
MikamiUitOpen 0:72e321f29769 43 yn = ap2.Execute(ap1.Execute(yn));
MikamiUitOpen 0:72e321f29769 44 // add direct input signal
MikamiUitOpen 0:72e321f29769 45 yn = yn + xn;
MikamiUitOpen 0:72e321f29769 46
MikamiUitOpen 0:72e321f29769 47 if (sw_.read() == 0) yn = xn; // no reverb
MikamiUitOpen 0:72e321f29769 48
MikamiUitOpen 0:72e321f29769 49 //-----------------------------------------------
MikamiUitOpen 0:72e321f29769 50 myDac_.Write(yn); // Write to DAC
MikamiUitOpen 0:72e321f29769 51 }
MikamiUitOpen 0:72e321f29769 52 }