GNU Radio 2.x: gr_fxpt_vco.h Source File

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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 */