diff --git a/IO.cpp b/IO.cpp
index 9ef3b7a..ba5922e 100644
--- a/IO.cpp
+++ b/IO.cpp
@@ -45,8 +45,8 @@ static q15_t NXDN_0_2_FILTER[] = {201, 174, 140, 99, 52, 0, -55, -112, -170, -22
 								  -365, -325, -278, -226, -170, -112, -55, 0, 52, 99, 140, 174, 201, 0};
 const uint16_t NXDN_0_2_FILTER_LEN = 162U;
 
-static q15_t NXDN_ISINC_FILTER[] = {790, -1085, -1073, -553, 747, 2341, 3156, 2152, -893, -4915, -7834, -7536, -3102, 4441, 12354, 17394, 17394,
-                                   12354, 4441, -3102, -7536, -7834, -4915, -893, 2152, 3156, 2341, 747, -553, -1073, -1085, 790};
+static q15_t NXDN_ISINC_FILTER[] = {7616, -1333, -1856, -2611, -3399, -4006, -4230, -3918, -2988, -1458, 561, 2867, 5200, 7276, 8832, 9665,
+                                    9665, 8832, 7276, 5200, 2867, 561, -1458, -2988, -3918, -4230, -4006, -3399, -2611, -1856, -1333, 7616};
 const uint16_t NXDN_ISINC_FILTER_LEN = 32U;
 
 // Generated using gaussfir(0.5, 4, 10) in MATLAB