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Diffstat (limited to 'codecs/ilbc/syntFilter.c')
-rw-r--r-- | codecs/ilbc/syntFilter.c | 108 |
1 files changed, 0 insertions, 108 deletions
diff --git a/codecs/ilbc/syntFilter.c b/codecs/ilbc/syntFilter.c deleted file mode 100644 index bb7f7a559..000000000 --- a/codecs/ilbc/syntFilter.c +++ /dev/null @@ -1,108 +0,0 @@ - -/****************************************************************** - - iLBC Speech Coder ANSI-C Source Code - - syntFilter.c - - Copyright (C) The Internet Society (2004). - All Rights Reserved. - -******************************************************************/ - -#include "iLBC_define.h" -#include "syntFilter.h" - -/*----------------------------------------------------------------* - * LP synthesis filter. - *---------------------------------------------------------------*/ - -void syntFilter( - float *Out, /* (i/o) Signal to be filtered */ - float *a, /* (i) LP parameters */ - int len, /* (i) Length of signal */ - float *mem /* (i/o) Filter state */ -){ - int i, j; - float *po, *pi, *pa, *pm; - - po=Out; - - /* Filter first part using memory from past */ - - for (i=0; i<LPC_FILTERORDER; i++) { - pi=&Out[i-1]; - pa=&a[1]; - pm=&mem[LPC_FILTERORDER-1]; - for (j=1; j<=i; j++) { - *po-=(*pa++)*(*pi--); - } - for (j=i+1; j<LPC_FILTERORDER+1; j++) { - *po-=(*pa++)*(*pm--); - } - po++; - } - - /* Filter last part where the state is entierly in - the output vector */ - - for (i=LPC_FILTERORDER; i<len; i++) { - - - pi=&Out[i-1]; - pa=&a[1]; - for (j=1; j<LPC_FILTERORDER+1; j++) { - *po-=(*pa++)*(*pi--); - } - po++; - } - - /* Update state vector */ - - memcpy(mem, &Out[len-LPC_FILTERORDER], - LPC_FILTERORDER*sizeof(float)); -} - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |