// generate sine waves in a linear scale of frequencies
//
#include <stdio.h>
#include <math.h>

#define PI (4*atan(1))
#define FS 8000.0 // audio sampling frequency

int main( void)
{
  double t, f;

  for( int i = 0; i < 1000; ++i)
  {
    t = i/FS; f = 500 + (i/100)*300;

    printf( "%g\n", sin(2*PI*f*t) );
  }

  return 0;
}

// assuming p1 is 3-point moving average:
// plot
// plot with args: | dft
// plot with args: | p1
// plot with args: | p1 | dft