From 86d994ad42a376ca22aa40cd0f583fe20388bbdd Mon Sep 17 00:00:00 2001
From: Jens Ahrensfeld <jens@jayfield.org>
Date: Thu, 10 Jan 2019 09:52:27 +0000
Subject: [PATCH] - reduced spurious detection of preamble

git-svn-id: http://moon:8086/svn/software/trunk/projects/GnuRadio@398 b431acfa-c32f-4a4a-93f1-934dc6c82436
---
 gr-jay/lib/preamble_sync_impl.cc | 26 +++++++++++++++++++++++---
 1 file changed, 23 insertions(+), 3 deletions(-)

diff --git a/gr-jay/lib/preamble_sync_impl.cc b/gr-jay/lib/preamble_sync_impl.cc
index 2912c1c..9bfca19 100644
--- a/gr-jay/lib/preamble_sync_impl.cc
+++ b/gr-jay/lib/preamble_sync_impl.cc
@@ -81,6 +81,7 @@ int preamble_sync_impl::general_work (int noutput_items, gr_vector_int &ninput_i
 			{
 				m_state = PreambleSlow;
 				m_wordCount = 0;
+				m_dataCount = 0;
 				fprintf(stderr, "Reset\n");
 			}
 			continue;
@@ -107,8 +108,18 @@ int preamble_sync_impl::general_work (int noutput_items, gr_vector_int &ninput_i
 			case PreambleSlow:
 				if ((m_word & 0xFF) == 0xCC)
 				{
-					m_wordSize = 1;
-					m_stateNext = SyncSlow;
+					m_wordSize = 8;
+					m_dataCount++;
+					if (m_dataCount == 8)
+					{
+						m_wordSize = 1;
+						m_stateNext = SyncSlow;
+					}
+					
+				}
+				else
+				{
+					m_dataCount = 0;
 				}
 				break;
 			case SyncSlow:
@@ -133,8 +144,17 @@ int preamble_sync_impl::general_work (int noutput_items, gr_vector_int &ninput_i
 				if ((m_word & 0xFF) == 0xAA)
 				{
 					m_wordSize = 8;
+					m_dataCount++;					
+					if (m_dataCount == 32)
+					{
+						m_wordSize = 8;
+						m_dataCount = 0;
+						m_stateNext = SyncFast;
+					}
+				}
+				else
+				{
 					m_dataCount = 0;
-					m_stateNext = SyncFast;
 				}
 				break;
 			case SyncFast: