annotate tools/sigproc.h @ 0:5242703e91d3 tip

Initial checkin for AIM92 aimR8.2 (last updated May 1997).

#define PI              3.14159265
#define TWOPI           6.2831853

#define MAXSHORT           32767.
#define MINSHORT        ( -32767. )

#define log2(x)         (log((double)x)/log(2.0))

typedef struct {
    float real;
    float imag;
} complex;

#define sq(x)           ((x)*(x))
#define Re(C)           (C)->real   /* cartesian form */
#define Im(C)           (C)->imag


/*
  V is m floats interpreted as m/2 complex numbers: (real,imag).
  mag: overwrite first m/2 floats with mod of m/2 complex numbers.
  phase: overwrite first m/2 floats with arg of m/2 complex numbers.
  fft: overwrite m floats with m/2 complex numbers (Fourier spectrum).
*/

#define mag(V,m)        Mod( (complex *)V, m>>1 )
#define phase(V,m)      Arg( (complex *)V, m>>1 )
#define fft(V,m,i)      realft( (float *)(V)-1, m>>1, i )


float mod();
float arg();


int   ispower();
int   getpower();

float ftos() ;

float *raised_cosine() ;
float *hamming()  ;
float *gauss_window() ;

short *getframe() ;