lpc10/energy.c

   1 /*
   2
   3  * Revision 1.1  1996/08/19  22:32:17  jaf
   4  * Initial revision
   5  *
   6
   7 */
   8
   9 /*  -- translated by f2c (version 19951025).
  10    You must link the resulting object file with the libraries:
  11         -lf2c -lm   (in that order)
  12 */
  13
  14 #include "f2c.h"
  15
  16 extern int energy_(integer *len, real *speech, real *rms);
  17
  18 /* ********************************************************************* */
  19
  20 /*      ENERGY Version 50 */
  21
  22 /*
  23  * Revision 1.1  1996/08/19  22:32:17  jaf
  24  * Initial revision
  25  * */
  26 /* Revision 1.3  1996/03/18  21:17:41  jaf */
  27 /* Just added a few comments about which array indices of the arguments */
  28 /* are used, and mentioning that this subroutine has no local state. */
  29
  30 /* Revision 1.2  1996/03/13  16:46:02  jaf */
  31 /* Comments added explaining that none of the local variables of this */
  32 /* subroutine need to be saved from one invocation to the next. */
  33
  34 /* Revision 1.1  1996/02/07 14:45:40  jaf */
  35 /* Initial revision */
  36
  37
  38 /* ********************************************************************* */
  39
  40 /* Compute RMS energy. */
  41
  42 /* Input: */
  43 /*  LEN    - Length of speech buffer */
  44 /*  SPEECH - Speech buffer */
  45 /*           Indices 1 through LEN read. */
  46 /* Output: */
  47 /*  RMS    - Root Mean Square energy */
  48
  49 /* This subroutine has no local state. */
  50
  51 /* Subroutine */ int energy_(integer *len, real *speech, real *rms)
  52 {
  53     /* System generated locals */
  54     integer i__1;
  55
  56     /* Builtin functions */
  57     double sqrt(doublereal);
  58
  59     /* Local variables */
  60     integer i__;
  61
  62 /*       Arguments */
  63 /*       Local variables that need not be saved */
  64     /* Parameter adjustments */
  65     --speech;
  66
  67     /* Function Body */
  68     *rms = 0.f;
  69     i__1 = *len;
  70     for (i__ = 1; i__ <= i__1; ++i__) {
  71         *rms += speech[i__] * speech[i__];
  72     }
  73     *rms = sqrt(*rms / *len);
  74     return 0;
  75 } /* energy_ */
  76