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+/* -*- 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 <blocks/nco.h>
+#include <VrSigProc.h>
+#include <VrHistoryProc.h>
+#include <VrDecimatingSigProc.h>
+#include <atsc/interleaver_fifo.h>
+#include <filtersingle_pole_iir.h>
+#include <filter/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_