1 files changed, 58 insertions, 0 deletions
diff --git a/gr-noaa/lib/noaa_hrpt_sync_fb.h b/gr-noaa/lib/noaa_hrpt_sync_fb.h
new file mode 100644
index 000000000..a9416b9ea
--- /dev/null
+++ b/gr-noaa/lib/noaa_hrpt_sync_fb.h
@@ -0,0 +1,58 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2009 Free Software Foundation, Inc.
+ * 
+ * This file is part of GNU Radio
+ * 
+ * GNU Radio is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ * 
+ * GNU Radio is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef INCLUDED_NOAA_HRPT_SYNC_FB_H
+#define INCLUDED_NOAA_HRPT_SYNC_FB_H
+
+#include <gr_block.h>
+
+class noaa_hrpt_sync_fb;
+typedef boost::shared_ptr<noaa_hrpt_sync_fb> noaa_hrpt_sync_fb_sptr;
+
+noaa_hrpt_sync_fb_sptr
+noaa_make_hrpt_sync_fb(float alpha, float beta, float sps, float max_offset);
+
+class noaa_hrpt_sync_fb : public gr_block
+{
+  friend noaa_hrpt_sync_fb_sptr noaa_make_hrpt_sync_fb(float alpha, float beta, float sps, float max_offset);
+  noaa_hrpt_sync_fb(float alpha, float beta, float sps, float max_offset);
+
+  float d_alpha;		// 1st order loop constant
+  float d_beta;			// 2nd order loop constant
+  float d_sps;                  // samples per symbol
+  float d_max_offset;		// Maximum frequency offset for d_sps, samples/symbol
+  float d_phase;		// Instantaneous symbol phase
+  float d_freq;			// Instantaneous symbol frequency, samples/symbol
+  int   d_last_sign;            // Tracks zero crossings
+
+ public:
+  int general_work(int noutput_items,
+		   gr_vector_int &ninput_items,
+		   gr_vector_const_void_star &input_items,
+		   gr_vector_void_star &output_items);
+
+  void set_alpha(float alpha) { d_alpha = alpha; }
+  void set_beta(float beta) { d_beta = beta; }
+  void set_max_offset(float max_offset) { d_max_offset = max_offset; }
+};
+
+#endif /* INCLUDED_NOAA_HRPT_SYNC_FB_H */