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