1 files changed, 59 insertions, 0 deletions
diff --git a/trunk/codecs/ilbc/hpOutput.c b/trunk/codecs/ilbc/hpOutput.c
new file mode 100644
index 000000000..fdc0f6db9
--- /dev/null
+++ b/trunk/codecs/ilbc/hpOutput.c
@@ -0,0 +1,59 @@
+
+/******************************************************************
+
+    iLBC Speech Coder ANSI-C Source Code
+
+    hpOutput.c 
+
+    Copyright (C) The Internet Society (2004). 
+    All Rights Reserved.
+
+
+
+******************************************************************/
+
+#include "constants.h"
+#include "hpOutput.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++;
+    }
+}
+
+