16adf6de8c
This patch includes the iLBC source code for distribution with Asterisk. Clarification regarding the iLBC source code was provided by Google, and the appropriate licenses have been included in the codecs/ilbc folder. Review: https://reviewboard.asterisk.org/r/1675 Review: https://reviewboard.asterisk.org/r/1649 (closes issue: ASTERISK-18943) Reporter: Leif Madsen Tested by: Matt Jordan ........ Merged revisions 351450 from http://svn.asterisk.org/svn/asterisk/branches/1.8 ........ Merged revisions 351451 from http://svn.asterisk.org/svn/asterisk/branches/10 git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@351452 65c4cc65-6c06-0410-ace0-fbb531ad65f3
66 lines
1.3 KiB
C
66 lines
1.3 KiB
C
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/******************************************************************
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iLBC Speech Coder ANSI-C Source Code
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hpInput.c
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Copyright (C) The Internet Society (2004).
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All Rights Reserved.
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******************************************************************/
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#include "constants.h"
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/*----------------------------------------------------------------*
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* Input high-pass filter
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*---------------------------------------------------------------*/
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void hpInput(
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float *In, /* (i) vector to filter */
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int len, /* (i) length of vector to filter */
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float *Out, /* (o) the resulting filtered vector */
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float *mem /* (i/o) the filter state */
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){
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int i;
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float *pi, *po;
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/* all-zero section*/
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pi = &In[0];
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po = &Out[0];
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for (i=0; i<len; i++) {
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*po = hpi_zero_coefsTbl[0] * (*pi);
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*po += hpi_zero_coefsTbl[1] * mem[0];
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*po += hpi_zero_coefsTbl[2] * mem[1];
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mem[1] = mem[0];
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mem[0] = *pi;
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po++;
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pi++;
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}
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/* all-pole section*/
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po = &Out[0];
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for (i=0; i<len; i++) {
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*po -= hpi_pole_coefsTbl[1] * mem[2];
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*po -= hpi_pole_coefsTbl[2] * mem[3];
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mem[3] = mem[2];
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mem[2] = *po;
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po++;
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}
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}
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