g++ [flags ...] file ... -l /isip/tools/lib/$ISIP_BINARY/lib_algo.a

#include <Spectrum.h>

Spectrum();
Spectrum(const Spectrum& arg);
boolean eq(const Spectrum& arg);
boolean setAlgorithm(ALGORITHM algorithm);
boolean setFtOrder(long order);

VectorFloat input;
VectorFloat output;
Spectrum spec;
input.assign(L"1.0, 2,0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0");
spec.compute(output, input);

• This example shows how to compute the spectrum of the sampled data:

  // isip include files
  //
  #include <Spectrum.h>
  
  // main program starts here
  //
  int main(int argc, const char **argv) {
    
    // declare a Spectrum object and an output vector
    //
    Spectrum spectrum;
    VectorFloat output;
  
    // generate 30 ms sine wave of frequency 1000Hz
    //
    long sample_freq = 8000;
    long num_samples  = 240;
  
    // set the input vector
    //
    VectorFloat input(num_samples);
    double step = Integral::TWO_PI * 1000.0 / (double)sample_freq;
    input.ramp(0, step); 
    input.sin();
  
    // set algorithm and implementation
    //
    spectrum.setAlgorithm(Spectrum::FOURIER);       
    spectrum.setImplementation(Spectrum::MAGNITUDE);
  
    // set the algorithm, implementation and order of the underlying
    // FourierTransform object
    //
    spectrum.setFtAlgorithm(FourierTransform::FFT);
    spectrum.setFtImplementation(FourierTransform::SPLIT_RADIX);  
    spectrum.setFtOrder((long)256);
  
    // compute the spectrum of input data
    //
    spectrum.compute(output, input);
  
    input.debug(L"input");
    spectrum.debug(L"spectrum");
    output.debug(L"output");
    
    // exit gracefully
    //
    Integral::exit();
  }
  

• none