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GrAtscBitTimingLoop2.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 _GRATSCBITTIMINGLOOP2_H_ 00024 #define _GRATSCBITTIMINGLOOP2_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 00040 class GrAtscBitTimingLoop2 : public VrDecimatingSigProc<float,float> { 00041 00042 public: 00043 00044 GrAtscBitTimingLoop2 (); 00045 virtual ~GrAtscBitTimingLoop2 () { }; 00046 00047 virtual const char *name () { return "GrAtscBitTimingLoop2"; } 00048 00049 virtual int forecast (VrSampleRange output, 00050 VrSampleRange inputs[]); 00051 00052 virtual int work (VrSampleRange output, void *o[], 00053 VrSampleRange inputs[], void *i[]); 00054 00055 // debug 00056 void set_mu (float a_mu) { 00057 assert (0 <= a_mu && a_mu <= 1.9); 00058 use_right_p = a_mu < 1.0; 00059 mu = a_mu - floor (a_mu); 00060 cerr << "BTL2: mu: " << mu << " use_right_p: " << use_right_p << endl; 00061 } 00062 00063 protected: 00064 00065 typedef float iType; 00066 typedef float oType; 00067 00068 iType produce_sample (const iType *in, unsigned int &index); 00069 float filter_error (float e); 00070 00071 VrSampleIndex next_input; 00072 gr_single_pole_iir<float,float,float> dc; // used to estimate DC component 00073 gr_mmse_fir_interpolator intr; 00074 float mu; // fractional delay 00075 iType last_right; // last right hand sample 00076 00077 bool use_right_p; // ...else middle 00078 }; 00079 00080 #endif // _GRATSCBITTIMINGLOOP2_H_

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