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energy.c
Package: 一个类似QQ的软件源码.rar [view]
Upload User: zslianheng
Upload Date: 2013-04-03
Package Size: 946k
Code Size: 2k
Category:
Linux-Unix program
Development Platform:
Visual C++
- /*
- $Log: energy.c,v $
- Revision 1.1.1.1 2002/07/28 05:23:27 freeman_yong
- lpc10 codec
- * 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 1.1.1.1 2002/07/28 05:23:27 freeman_yong
- /* lpc10 codec
- /*
- * 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_ */