window.c

来自「speech signal process tools」· C语言 代码 · 共 27 行

/*
| This material contains proprietary software of Entropic Processing, Inc.   
| Any reproduction, distribution, or publication without the the prior	   
| written permission of Entropic Processing, Inc. is strictly prohibited.
| Any public distribution of copies of this work authorized in writing by
| Entropic Processing, Inc. must bear the notice			
|								
|              "Copyright 1986 Entropic Processing, Inc."
*/
#ifdef SCCS
static char *sccs_id = "@(#)window.c	1.2 4/29/86";
#endif
void
hamming (data,size) /* perform Hamming window on data */
float data[];
int size;
{
    float   twopibyn;
    double  cos ();
    int     i;

    twopibyn = 6.283185307 / (size-1);
    for (i = 0; i < size; i++)
	data[i] = data[i] * (0.54 - 0.46 * cos ((double) twopibyn * i));
}