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GrAtscBitTimingLoop.h

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00001 /* -*- c++ -*- */
00002 /*
00003  * Copyright 2002 Free Software Foundation, Inc.
00004  * 
00005  * This file is part of GNU Radio
00006  * 
00007  * GNU Radio is free software; you can redistribute it and/or modify
00008  * it under the terms of the GNU General Public License as published by
00009  * the Free Software Foundation; either version 2, or (at your option)
00010  * any later version.
00011  * 
00012  * GNU Radio is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00015  * GNU General Public License for more details.
00016  * 
00017  * You should have received a copy of the GNU General Public License
00018  * along with GNU Radio; see the file COPYING.  If not, write to
00019  * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
00020  * Boston, MA 02111-1307, USA.
00021  */
00022 
00023 #ifndef _GRATSCBITTIMINGLOOP_H_
00024 #define _GRATSCBITTIMINGLOOP_H_
00025 
00026 #include <gr_nco.h>
00027 #include <VrSigProc.h>
00028 #include <VrHistoryProc.h>
00029 #include <VrDecimatingSigProc.h>
00030 #include <interleaver_fifo.h>
00031 #include <gr_single_pole_iir.h>
00032 #include <gr_mmse_fir_interpolator.h>
00033 #include <atsc_slicer_agc.h>
00034 #include <stdio.h>
00035 #include <atsc_diag_output.h>
00036 
00037 
00044 class GrAtscBitTimingLoop : public VrDecimatingSigProc<float,float> {
00045 
00046  public:
00047 
00048   GrAtscBitTimingLoop ();
00049   virtual ~GrAtscBitTimingLoop () { };
00050 
00051   virtual const char *name () { return "GrAtscBitTimingLoop"; }
00052 
00053   virtual int forecast (VrSampleRange output,
00054                         VrSampleRange inputs[]);
00055 
00056   virtual int work (VrSampleRange output, void *o[],
00057                     VrSampleRange inputs[], void *i[]);
00058 
00059   // debug
00060   void set_mu (double a_mu) { mu = a_mu; }
00061   void set_no_update (bool a_no_update) { debug_no_update = a_no_update; }
00062   void set_loop_filter_tap (double tap)  { loop.set_taps (tap); }
00063   void set_timing_rate (double rate)     { d_timing_rate = rate; }
00064 
00065  protected:
00066 
00067   typedef float iType;
00068   typedef float oType;
00069 
00070   iType produce_sample (const iType *in, unsigned int &index);
00071   double filter_error (double e);
00072 
00073   VrSampleIndex                         next_input;
00074   gr_mmse_fir_interpolator              intr;
00075   double                                w;              // timing control word
00076   double                                mu;             // fractional delay
00077   iType                                 last_right;     // last right hand sample
00078   gr_single_pole_iir<double,double,double>      loop;
00079   bool                                  debug_no_update;// debug
00080 
00081   double                                d_loop_filter_tap;
00082   double                                d_timing_rate;
00083   
00084 #ifdef _BT_DIAG_OUTPUT_
00085   FILE                                  *fp_loop;
00086   FILE                                  *fp_ps;
00087 #endif
00088 };
00089 
00090 #endif // _GRATSCBITTIMINGLOOP_H_

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