#include "LPC.h" // http://kbs.cs.tu-berlin.de/~jutta/gsm/lpc.html #define P_MAX 8 /* order p of LPC analysis, typically 8..14 */ /* Invented by N. Levinson in 1947, modified by J. Durbin in 1959. */ double /* returns minimum mean square error */ levinson_durbin( double const * ac, /* in: [0...p] autocorrelation values */ double * ref, /* out: [0...p-1] reflection coef's */ double * lpc) /* [0...p