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gr_fxpt_nco.h

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00001 /* -*- c++ -*- */
00002 /*
00003  * Copyright 2002,2004 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_NCO_H
00023 #define INCLUDED_GR_FXPT_NCO_H
00024 
00025 #include <gr_fxpt.h>
00026 
00030 class gr_fxpt_nco {
00031   gr_int32      d_phase;
00032   gr_int32      d_phase_inc;
00033 
00034 public:
00035   gr_fxpt_nco () : d_phase (0), d_phase_inc (0) {}
00036 
00037   ~gr_fxpt_nco () {}
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   // angle_rate is in radians / step
00049   void set_freq (float angle_rate){
00050     d_phase_inc = gr_fxpt::float_to_fixed (angle_rate);
00051   }
00052 
00053   // angle_rate is a delta in radians / step
00054   void adjust_freq (float delta_angle_rate)
00055   {
00056     d_phase_inc += gr_fxpt::float_to_fixed (delta_angle_rate);
00057   }
00058 
00059   // increment current phase angle
00060 
00061   void step () 
00062   { 
00063     d_phase += d_phase_inc;
00064   }
00065 
00066   void step (int n)
00067   {
00068     d_phase += d_phase_inc * n;
00069   }
00070 
00071   // units are radians / step
00072   float get_phase () const { return gr_fxpt::fixed_to_float (d_phase); }
00073   float get_freq () const { return gr_fxpt::fixed_to_float (d_phase_inc); }
00074 
00075   // compute sin and cos for current phase angle
00076   void sincos (float *sinx, float *cosx) const
00077   {
00078     *sinx = gr_fxpt::sin (d_phase);
00079     *cosx = gr_fxpt::cos (d_phase);
00080   }
00081 
00082   // compute cos or sin for current phase angle
00083   float cos () const { return gr_fxpt::cos (d_phase); }
00084   float sin () const { return gr_fxpt::sin (d_phase); }
00085 };
00086 
00087 #endif /* INCLUDED_GR_FXPT_NCO_H */

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