不韋 呂
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UIT2_AllpassReverb
Reverb system using singlae allpass filter for ST Nucleo F401RE.
main.cpp@0:29f3efdfaee8, 2014-10-31 (annotated)
- Committer:
- MikamiUitOpen
- Date:
- Fri Oct 31 08:12:49 2014 +0000
- Revision:
- 0:29f3efdfaee8
- Child:
- 1:8f8550f46b19
1
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
MikamiUitOpen | 0:29f3efdfaee8 | 1 | //-------------------------------------------------------------- |
MikamiUitOpen | 0:29f3efdfaee8 | 2 | // Reverb system using all-pass filter |
MikamiUitOpen | 0:29f3efdfaee8 | 3 | // 2014/10/31, Copyright (c) 2014 MIKAMI, Naoki |
MikamiUitOpen | 0:29f3efdfaee8 | 4 | //-------------------------------------------------------------- |
MikamiUitOpen | 0:29f3efdfaee8 | 5 | |
MikamiUitOpen | 0:29f3efdfaee8 | 6 | #include "mbed.h" |
MikamiUitOpen | 0:29f3efdfaee8 | 7 | |
MikamiUitOpen | 0:29f3efdfaee8 | 8 | #include "ADC_Base.hpp" // for ADC not using interrupt |
MikamiUitOpen | 0:29f3efdfaee8 | 9 | #include "DAC_MCP4922.hpp" // for DAC MCP4922 |
MikamiUitOpen | 0:29f3efdfaee8 | 10 | #include "ScfClockTim3.hpp" // for clock supplied to SCF |
MikamiUitOpen | 0:29f3efdfaee8 | 11 | |
MikamiUitOpen | 0:29f3efdfaee8 | 12 | using namespace Mikami; |
MikamiUitOpen | 0:29f3efdfaee8 | 13 | |
MikamiUitOpen | 0:29f3efdfaee8 | 14 | const int FS_ = 12000; // Sampling frequency: 12 kHz |
MikamiUitOpen | 0:29f3efdfaee8 | 15 | ADC_Base adc_(A0, FS_); // for AD |
MikamiUitOpen | 0:29f3efdfaee8 | 16 | DAC_MCP4922 myDac_; // for DA |
MikamiUitOpen | 0:29f3efdfaee8 | 17 | |
MikamiUitOpen | 0:29f3efdfaee8 | 18 | const float G_A_ = 0.6f; |
MikamiUitOpen | 0:29f3efdfaee8 | 19 | const int M1 = 1153; |
MikamiUitOpen | 0:29f3efdfaee8 | 20 | float unD[M1]; |
MikamiUitOpen | 0:29f3efdfaee8 | 21 | |
MikamiUitOpen | 0:29f3efdfaee8 | 22 | DigitalIn sw_(D2, PullDown); |
MikamiUitOpen | 0:29f3efdfaee8 | 23 | |
MikamiUitOpen | 0:29f3efdfaee8 | 24 | int main() |
MikamiUitOpen | 0:29f3efdfaee8 | 25 | { |
MikamiUitOpen | 0:29f3efdfaee8 | 26 | ScfClockTim3(500000); // cutoff frequency: 5 kHz |
MikamiUitOpen | 0:29f3efdfaee8 | 27 | |
MikamiUitOpen | 0:29f3efdfaee8 | 28 | for (int n=0; n<M1; n++) unD[n] = 0.0f; |
MikamiUitOpen | 0:29f3efdfaee8 | 29 | int nD = 0; |
MikamiUitOpen | 0:29f3efdfaee8 | 30 | |
MikamiUitOpen | 0:29f3efdfaee8 | 31 | while (true) |
MikamiUitOpen | 0:29f3efdfaee8 | 32 | { |
MikamiUitOpen | 0:29f3efdfaee8 | 33 | float xn = adc_.Read(); // Read from A0 |
MikamiUitOpen | 0:29f3efdfaee8 | 34 | //----------------------------------------------- |
MikamiUitOpen | 0:29f3efdfaee8 | 35 | |
MikamiUitOpen | 0:29f3efdfaee8 | 36 | float yn; |
MikamiUitOpen | 0:29f3efdfaee8 | 37 | if (sw_.read() == 1) |
MikamiUitOpen | 0:29f3efdfaee8 | 38 | { |
MikamiUitOpen | 0:29f3efdfaee8 | 39 | float un = xn + G_A_*unD[nD]; |
MikamiUitOpen | 0:29f3efdfaee8 | 40 | yn = -G_A_*un + unD[nD]; |
MikamiUitOpen | 0:29f3efdfaee8 | 41 | unD[nD++] = un; |
MikamiUitOpen | 0:29f3efdfaee8 | 42 | if (nD >= M1) nD = 0; |
MikamiUitOpen | 0:29f3efdfaee8 | 43 | } |
MikamiUitOpen | 0:29f3efdfaee8 | 44 | else |
MikamiUitOpen | 0:29f3efdfaee8 | 45 | yn = xn; |
MikamiUitOpen | 0:29f3efdfaee8 | 46 | |
MikamiUitOpen | 0:29f3efdfaee8 | 47 | //----------------------------------------------- |
MikamiUitOpen | 0:29f3efdfaee8 | 48 | myDac_.Write(yn); // Write to DAC |
MikamiUitOpen | 0:29f3efdfaee8 | 49 | } |
MikamiUitOpen | 0:29f3efdfaee8 | 50 | } |
MikamiUitOpen | 0:29f3efdfaee8 | 51 |