From a4814bf351349e0c73de85782ef5e8ca459a4666 Mon Sep 17 00:00:00 2001
From: Jonathan Naylor <naylorjs@yahoo.com>
Date: Wed, 9 Mar 2016 07:01:08 +0000
Subject: [PATCH] Reduce the C4FSK filter length significantly.

---
 Config.h       | 2 +-
 IO.cpp         | 6 ++----
 SerialPort.cpp | 2 +-
 3 files changed, 4 insertions(+), 6 deletions(-)

diff --git a/Config.h b/Config.h
index 83adc12..9189105 100644
--- a/Config.h
+++ b/Config.h
@@ -19,7 +19,7 @@
 #if !defined(CONFIG_H)
 #define  CONFIG_H
 
-#define  WANT_DEBUG
+// #define  WANT_DEBUG
 
 // Allow the use of the COS line to lockout the modem
 // #define USE_COS_AS_LOCKOUT
diff --git a/IO.cpp b/IO.cpp
index 42cedb6..779a3f7 100644
--- a/IO.cpp
+++ b/IO.cpp
@@ -21,10 +21,8 @@
 #include "IO.h"
 
 // Generated using rcosdesign(0.2, 8, 5, 'sqrt') in MATLAB
-static q15_t   C4FSK_FILTER[] = {401, 104, -340, -731, -847, -553, 112, 909, 1472, 1450, 683, -675, -2144, -3040, -2706, -770, 2667, 6995,
-                                 11237, 14331, 15464, 14331, 11237, 6995, 2667, -770, -2706, -3040, -2144, -675, 683, 1450, 1472, 909, 112,
-                                 -553, -847, -731, -340, 104, 401, 0};
-const uint16_t C4FSK_FILTER_LEN = 42U;
+static q15_t   C4FSK_FILTER[] = {2667, 6995, 11237, 14331, 15464, 14331, 11237, 6995, 2667, 0};
+const uint16_t C4FSK_FILTER_LEN = 10U;
 
 // Generated using gaussfir(0.5, 4, 5) in MATLAB
 static q15_t   GMSK_FILTER[] = {8, 104, 760, 3158, 7421, 9866, 7421, 3158, 760, 104, 8, 0};
diff --git a/SerialPort.cpp b/SerialPort.cpp
index 31508bf..b6f3357 100644
--- a/SerialPort.cpp
+++ b/SerialPort.cpp
@@ -57,7 +57,7 @@ const uint8_t MMDVM_DEBUG4       = 0xF4U;
 const uint8_t MMDVM_DEBUG5       = 0xF5U;
 const uint8_t MMDVM_SAMPLES      = 0xF8U;
 
-const uint8_t HARDWARE[]         = "MMDVM 20160308 (D-Star/DMR/System Fusion)";
+const uint8_t HARDWARE[]         = "MMDVM 20160309 (D-Star/DMR/System Fusion)";
 
 const uint8_t PROTOCOL_VERSION   = 1U;