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

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

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tools/sigproc.h	Fri May 20 15:19:45 2011 +0100
@@ -0,0 +1,45 @@
+
+#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() ;