Software Implementation in C++
Figure 3.3 gives a C++ program for implementing the same filter using the Synthesis Tool Kit (STK). The example writes a sound file containing white-noise followed by filtered-noise from the example filter.
/* main.cpp - filtered white noise example */ #include "Noise.h" /* Synthesis Tool Kit (STK) class */ #include "Filter.h" /* STK class */ #include "FileWvOut.h" /* STK class */ #include <cmath> /* for pow() */ #include <vector> int main() { Noise *theNoise = new Noise(); // Noise source /* Set up the filter */ StkFloat bCoefficients[5] = {1,0,0,pow(0.5,3)}; std::vector<StkFloat> b(bCoefficients, bCoefficients+5); StkFloat aCoefficients[7] = {1,0,0,0,0,pow(0.9,5)}; std::vector<StkFloat> a(aCoefficients, aCoefficients+7); Filter *theFilter = new Filter; theFilter->setNumerator(b); theFilter->setDenominator(a); FileWvOut output("main"); /* write to main.wav */ /* Generate one second of white noise */ StkFloat amp = 0.1; // noise amplitude for (long i=0;i<SRATE;i++) { output.tick(amp*theNoise->tick()); } /* Generate filtered noise for comparison */ for (long i=0;i<SRATE;i++) { output.tick(theFilter->tick(amp*theNoise->tick())); } } |
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