From 9ae4104e30ceab7b57df543199253bfa552d42f7 Mon Sep 17 00:00:00 2001
From: mattf <mattf@5390a7c7-147a-4af0-8ec9-7488f05a26cb>
Date: Fri, 24 Feb 2006 19:51:14 +0000
Subject: Make DC removal compile time option

git-svn-id: http://svn.digium.com/svn/zaptel/trunk@969 5390a7c7-147a-4af0-8ec9-7488f05a26cb
---
 mg2ec.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

(limited to 'mg2ec.h')

diff --git a/mg2ec.h b/mg2ec.h
index 8ad9a92..b175388 100644
--- a/mg2ec.h
+++ b/mg2ec.h
@@ -41,6 +41,7 @@
 #define FREE(a) free(a)
 #endif
 
+
 #define ABS(a) abs(a!=-32768?a:-32767)
 
 #define RESTORE_COEFFS {\
@@ -64,6 +65,8 @@
 /* Bring in definitions for the various constants and thresholds */
 #include "mg2ec_const.h"
 
+#define DC_NORMALIZE
+
 #ifndef NULL
 #define NULL 0
 #endif
@@ -155,7 +158,9 @@ struct echo_can_state {
 	short lastsig[256];
 	int lastpos;
 	int backup;
+#ifdef DC_NORMALIZE
 	int dc_estimate;
+#endif
 
 };
 
@@ -258,15 +263,19 @@ static inline void init_cc(struct echo_can_state *ec, int N, int maxy, int maxu)
 
 static inline void echo_can_free(struct echo_can_state *ec)
 {
+#ifdef DC_NORMALIZE
 	printk("EC: DC bias calculated: %d V\n", ec->dc_estimate >> 15);
+#endif
 	FREE(ec);
 }
 
+#ifdef DC_NORMALIZE
 short inline dc_removal(int *dc_estimate, short samp)
 {
 	*dc_estimate += ((((int)samp << 15) - *dc_estimate) >> 9);
 	return samp - (*dc_estimate >> 15);
 }
+#endif
 
 static inline short echo_can_update(struct echo_can_state *ec, short iref, short isig) 
 {
@@ -283,7 +292,9 @@ static inline short echo_can_update(struct echo_can_state *ec, short iref, short
 	/* ... */
 	int two_beta_i;
 
+#ifdef DC_NORMALIZE
 	isig = dc_removal(&ec->dc_estimate, isig);
+#endif
 	
 	/* flow A on pg. 428 */
 	/* eq. (16): high-pass filter the input to generate the next value;
-- 
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