energy.c

这是LPC-10压缩算法的源代码,愿共享之.也希望能赐与MELP方面的算法源码.

/*

$Log: energy.c,v $
 * Revision 1.1  1996/08/19  22:32:17  jaf
 * Initial revision
 *

*/

#ifdef P_R_O_T_O_T_Y_P_E_S
extern int energy_(integer *len, real *speech, real *rms);
#endif

/*  -- translated by f2c (version 19951025).
   You must link the resulting object file with the libraries:
	-lf2c -lm   (in that order)
*/

#include "f2c.h"

/* ********************************************************************* */

/* 	ENERGY Version 50 */

/* $Log: energy.c,v $
 * Revision 1.1  1996/08/19  22:32:17  jaf
 * Initial revision
 * */
/* Revision 1.3  1996/03/18  21:17:41  jaf */
/* Just added a few comments about which array indices of the arguments */
/* are used, and mentioning that this subroutine has no local state. */

/* Revision 1.2  1996/03/13  16:46:02  jaf */
/* Comments added explaining that none of the local variables of this */
/* subroutine need to be saved from one invocation to the next. */

/* Revision 1.1  1996/02/07 14:45:40  jaf */
/* Initial revision */


/* ********************************************************************* */

/* Compute RMS energy. */

/* Input: */
/*  LEN    - Length of speech buffer */
/*  SPEECH - Speech buffer */
/*           Indices 1 through LEN read. */
/* Output: */
/*  RMS    - Root Mean Square energy */

/* This subroutine has no local state. */

/* Subroutine */ int energy_(integer *len, real *speech, real *rms)
{
    /* System generated locals */
    integer i__1;

    /* Builtin functions */
    double sqrt(doublereal);

    /* Local variables */
    integer i__;

/*       Arguments */
/*       Local variables that need not be saved */
    /* Parameter adjustments */
    --speech;

    /* Function Body */
    *rms = 0.f;
    i__1 = *len;
    for (i__ = 1; i__ <= i__1; ++i__) {
	*rms += speech[i__] * speech[i__];
    }
    *rms = sqrt(*rms / *len);
    return 0;
} /* energy_ */