--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/intercom/ilbc/hpOutput.c	Fri Jun 25 09:57:52 2010 +0200
@@ -0,0 +1,55 @@
+
+   /******************************************************************
+
+       iLBC Speech Coder ANSI-C Source Code
+
+       hpOutput.c
+
+       Copyright (C) The Internet Society (2004).
+       All Rights Reserved.
+
+   ******************************************************************/
+
+#include "constants.h"
+
+   /*----------------------------------------------------------------*
+    *  Output high-pass filter
+    *---------------------------------------------------------------*/
+
+void hpOutput(float *In,        /* (i) vector to filter */
+  int len,                      /* (i) length of vector to filter */
+  float *Out,                   /* (o) the resulting filtered vector */
+  float *mem                    /* (i/o) the filter state */
+  )
+{
+  int i;
+  float *pi, *po;
+
+  /* all-zero section */
+
+  pi = &In[0];
+  po = &Out[0];
+  for (i = 0; i < len; i++) {
+    *po = hpo_zero_coefsTbl[0] * (*pi);
+    *po += hpo_zero_coefsTbl[1] * mem[0];
+    *po += hpo_zero_coefsTbl[2] * mem[1];
+
+    mem[1] = mem[0];
+    mem[0] = *pi;
+    po++;
+    pi++;
+
+  }
+
+  /* all-pole section */
+
+  po = &Out[0];
+  for (i = 0; i < len; i++) {
+    *po -= hpo_pole_coefsTbl[1] * mem[2];
+    *po -= hpo_pole_coefsTbl[2] * mem[3];
+
+    mem[3] = mem[2];
+    mem[2] = *po;
+    po++;
+  }
+}