From 57b90920feace95b08b4eadc1986ebba41764869 Mon Sep 17 00:00:00 2001
From: Jonathan Naylor <naylorjs@yahoo.com>
Date: Thu, 7 Jul 2016 21:46:54 +0100
Subject: [PATCH] Add additional filters.

---
 DMRTX.cpp | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/DMRTX.cpp b/DMRTX.cpp
index 9b937d6..e6238dd 100644
--- a/DMRTX.cpp
+++ b/DMRTX.cpp
@@ -23,11 +23,31 @@
 #include "Globals.h"
 #include "DMRSlotType.h"
 
+// Uncomment one of the following to change the filter
+#define USE8
+// #define USE6
+// #define USE4
+
+#if defined(USE8)
 // Generated using rcosdesign(0.2, 8, 5, 'sqrt') in MATLAB
 static q15_t DMR_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 DMR_C4FSK_FILTER_LEN = 42U;
+#elif defined(USE6)
+// Generated using rcosdesign(0.2, 6, 5, 'sqrt') in MATLAB
+static q15_t DMR_C4FSK_FILTER[] = {-554, 112, 911, 1474, 1452, 684, -676, -2147, -3045, -2710, -772,  2671, 7005,
+                                   11253, 14352, 15486, 14352, 11253, 7005, 2671, -772, -2710, -3045, -2147, -676,
+                                   684, 1452, 1474, 911, 112, -554, 0};
+const uint16_t DMR_C4FSK_FILTER_LEN = 32U;
+#elif defined(USE4)
+// Generated using rcosdesign(0.2, 4, 5, 'sqrt') in MATLAB
+static q15_t DMR_C4FSK_FILTER[] = {688, -680, -2158, -3060, -2724, -775, 2684, 7041, 11310, 14425, 15565, 14425,
+                                   11310, 7041, 2684, -775, -2724, -3060, -2158, -680, 688, 0};
+const uint16_t DMR_C4FSK_FILTER_LEN = 22U;
+#else
+#error "Must define one of USE8, USE6, or USE4."
+#endif
 
 const q15_t DMR_LEVELA[] = { 640,  640 , 640,  640,  640};
 const q15_t DMR_LEVELB[] = { 213,  213,  213,  213,  213};