Merge branch 'upstream' into dfsg-orig

[debian/gnuradio] / gr-atsc / src / lib / GrAtscBitTimingLoop2.h

diff --git a/gr-atsc/src/lib/GrAtscBitTimingLoop2.h b/gr-atsc/src/lib/GrAtscBitTimingLoop2.h
new file mode 100644 (file)
index 0000000..c03e64a
--- /dev/null
+++ b/gr-atsc/src/lib/GrAtscBitTimingLoop2.h
@@ -0,0 +1,80 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2002 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 _GRATSCBITTIMINGLOOP2_H_
+#define _GRATSCBITTIMINGLOOP2_H_
+
+#include <gr_nco.h>
+#include <VrSigProc.h>
+#include <VrHistoryProc.h>
+#include <VrDecimatingSigProc.h>
+#include <interleaver_fifo.h>
+#include <gr_single_pole_iir.h>
+#include <gr_mmse_fir_interpolator.h>
+
+/*!
+ * \brief ATSC BitTimingLoop
+ *
+ * This class accepts a single real input and produces a single real output
+ */
+
+class GrAtscBitTimingLoop2 : public VrDecimatingSigProc<float,float> {
+
+ public:
+
+  GrAtscBitTimingLoop2 ();
+  virtual ~GrAtscBitTimingLoop2 () { };
+
+  virtual const char *name () { return "GrAtscBitTimingLoop2"; }
+
+  virtual int forecast (VrSampleRange output,
+                       VrSampleRange inputs[]);
+
+  virtual int work (VrSampleRange output, void *o[],
+                   VrSampleRange inputs[], void *i[]);
+
+  // debug
+  void set_mu (float a_mu) {
+    assert (0 <= a_mu && a_mu <= 1.9);
+    use_right_p = a_mu < 1.0;
+    mu = a_mu - floor (a_mu);
+    cerr << "BTL2:  mu: " << mu << " use_right_p: " << use_right_p << endl;
+  }
+
+ protected:
+
+  typedef float iType;
+  typedef float oType;
+
+  iType produce_sample (const iType *in, unsigned int &index);
+  float filter_error (float e);
+
+  VrSampleIndex                                next_input;
+  gr_single_pole_iir<float,float,float>        dc;             // used to estimate DC component
+  gr_mmse_fir_interpolator             intr;
+  float                                        mu;             // fractional delay
+  iType                                        last_right;     // last right hand sample
+
+  bool                                 use_right_p;    // ...else middle
+};
+
+#endif // _GRATSCBITTIMINGLOOP2_H_