rctoc.c

来自「speech signal process tools」· C语言 代码 · 共 40 行

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/*| 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 SCCSstatic char *sccs_id = "@(#)rctoc.c	1.2 4/29/86";#endifrctoc(rc,order,c,pgain)	/* convert reflection coefficients to filter coefficients */float rc[],c[],*pgain;int order;{    float   tmp,            ctmp[1000],            gain = 1.0;    int     i,            j;    for (i = 1; i <= order; i++) {	tmp = rc[i];	gain = gain * (1.0 - tmp * tmp);    /* 	printf("rc(%d) = %f, gain = %f\n",i,tmp,gain); */	if (i != 1) {	    for (j = 1; j < i; j++)		ctmp[j] = c[j] - tmp * c[i - j];	}	ctmp[i] = tmp;	for (j = 1; j <= i; j++)	    c[j] = ctmp[j];    }    *pgain = gain;}

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