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gr_fxpt_vco.h

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00001 /* -*- c++ -*- */
00002 /*
00003  * Copyright 2002,2004,2005 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 #ifndef INCLUDED_GR_FXPT_VCO_H
00023 #define INCLUDED_GR_FXPT_VCO_H
00024 
00025 #include <gr_fxpt.h>
00026 #include <gr_complex.h>
00027 
00031 class gr_fxpt_vco {
00032   gr_int32      d_phase;
00033 
00034 public:
00035   gr_fxpt_vco () : d_phase (0) {}
00036 
00037   ~gr_fxpt_vco () {}
00038 
00039   // radians
00040   void set_phase (float angle) {
00041     d_phase = gr_fxpt::float_to_fixed (angle);
00042   }
00043 
00044   void adjust_phase (float delta_phase) {
00045     d_phase += gr_fxpt::float_to_fixed (delta_phase);
00046   }
00047 
00048   float get_phase () const { return gr_fxpt::fixed_to_float (d_phase); }
00049 
00050   // compute sin and cos for current phase angle
00051   void sincos (float *sinx, float *cosx) const
00052   {
00053     *sinx = gr_fxpt::sin (d_phase);
00054     *cosx = gr_fxpt::cos (d_phase);
00055   }
00056 
00057   // compute a block at a time
00058   void cos (float *output, const float *input, int noutput_items, float k, float ampl = 1.0)
00059   {
00060     for (int i = 0; i < noutput_items; i++){
00061       output[i] = (float)(gr_fxpt::cos (d_phase) * ampl);
00062       adjust_phase(input[i] * k);
00063     }
00064   }
00065 
00066   // compute cos or sin for current phase angle
00067   float cos () const { return gr_fxpt::cos (d_phase); }
00068   float sin () const { return gr_fxpt::sin (d_phase); }
00069 };
00070 
00071 #endif /* INCLUDED_GR_FXPT_VCO_H */

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