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<h1>gr_nco.h</h1> </div>
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<a href="gr__nco_8h.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/* -*- c++ -*- */</span>
<a name="l00002"></a>00002 <span class="comment">/*</span>
<a name="l00003"></a>00003 <span class="comment"> * Copyright 2002 Free Software Foundation, Inc.</span>
<a name="l00004"></a>00004 <span class="comment"> * </span>
<a name="l00005"></a>00005 <span class="comment"> * This file is part of GNU Radio</span>
<a name="l00006"></a>00006 <span class="comment"> * </span>
<a name="l00007"></a>00007 <span class="comment"> * GNU Radio is free software; you can redistribute it and/or modify</span>
<a name="l00008"></a>00008 <span class="comment"> * it under the terms of the GNU General Public License as published by</span>
<a name="l00009"></a>00009 <span class="comment"> * the Free Software Foundation; either version 3, or (at your option)</span>
<a name="l00010"></a>00010 <span class="comment"> * any later version.</span>
<a name="l00011"></a>00011 <span class="comment"> * </span>
<a name="l00012"></a>00012 <span class="comment"> * GNU Radio is distributed in the hope that it will be useful,</span>
<a name="l00013"></a>00013 <span class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<a name="l00014"></a>00014 <span class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span>
<a name="l00015"></a>00015 <span class="comment"> * GNU General Public License for more details.</span>
<a name="l00016"></a>00016 <span class="comment"> * </span>
<a name="l00017"></a>00017 <span class="comment"> * You should have received a copy of the GNU General Public License</span>
<a name="l00018"></a>00018 <span class="comment"> * along with GNU Radio; see the file COPYING. If not, write to</span>
<a name="l00019"></a>00019 <span class="comment"> * the Free Software Foundation, Inc., 51 Franklin Street,</span>
<a name="l00020"></a>00020 <span class="comment"> * Boston, MA 02110-1301, USA.</span>
<a name="l00021"></a>00021 <span class="comment"> */</span>
<a name="l00022"></a>00022 <span class="preprocessor">#ifndef _GR_NCO_H_</span>
<a name="l00023"></a>00023 <span class="preprocessor"></span><span class="preprocessor">#define _GR_NCO_H_</span>
<a name="l00024"></a>00024 <span class="preprocessor"></span>
<a name="l00025"></a>00025
<a name="l00026"></a>00026 <span class="preprocessor">#include <vector></span>
<a name="l00027"></a>00027 <span class="preprocessor">#include <gr_sincos.h></span>
<a name="l00028"></a>00028 <span class="preprocessor">#include <cmath></span>
<a name="l00029"></a>00029 <span class="preprocessor">#include <gr_complex.h></span>
<a name="l00030"></a>00030 <span class="comment"></span>
<a name="l00031"></a>00031 <span class="comment">/*!</span>
<a name="l00032"></a>00032 <span class="comment"> * \brief base class template for Numerically Controlled Oscillator (NCO)</span>
<a name="l00033"></a>00033 <span class="comment"> * \ingroup misc</span>
<a name="l00034"></a>00034 <span class="comment"> */</span>
<a name="l00035"></a>00035
<a name="l00036"></a>00036
<a name="l00037"></a>00037 <span class="comment">//FIXME Eventually generalize this to fixed point</span>
<a name="l00038"></a>00038
<a name="l00039"></a>00039 <span class="keyword">template</span><<span class="keyword">class</span> o_type, <span class="keyword">class</span> i_type>
<a name="l00040"></a><a class="code" href="classgr__nco.html">00040</a> <span class="keyword">class </span><a class="code" href="classgr__nco.html" title="base class template for Numerically Controlled Oscillator (NCO)">gr_nco</a> {
<a name="l00041"></a>00041 <span class="keyword">public</span>:
<a name="l00042"></a><a class="code" href="classgr__nco.html#a2559257b4b1ef02dc1b4a8da4f49e583">00042</a> <a class="code" href="classgr__nco.html#a2559257b4b1ef02dc1b4a8da4f49e583">gr_nco</a> () : <a class="code" href="classgr__nco.html#a987170cc17a73fbee7174339931a10ec">phase</a> (0), <a class="code" href="classgr__nco.html#a2059238c2da93a471fce526bdd2dc6e2">phase_inc</a>(0) {}
<a name="l00043"></a>00043
<a name="l00044"></a><a class="code" href="classgr__nco.html#a9e9f508bff7e014c64a6dce17bffbfa9">00044</a> <span class="keyword">virtual</span> <a class="code" href="classgr__nco.html#a9e9f508bff7e014c64a6dce17bffbfa9">~gr_nco</a> () {}
<a name="l00045"></a>00045
<a name="l00046"></a>00046 <span class="comment">// radians</span>
<a name="l00047"></a><a class="code" href="classgr__nco.html#a0f06623da940487d6c546997debb0af0">00047</a> <span class="keywordtype">void</span> <a class="code" href="classgr__nco.html#a0f06623da940487d6c546997debb0af0">set_phase</a> (<span class="keywordtype">double</span> angle) {
<a name="l00048"></a>00048 <a class="code" href="classgr__nco.html#a987170cc17a73fbee7174339931a10ec">phase</a> = angle;
<a name="l00049"></a>00049 }
<a name="l00050"></a>00050
<a name="l00051"></a><a class="code" href="classgr__nco.html#adebaf4df7e9d941bef8d15785dfff6cd">00051</a> <span class="keywordtype">void</span> <a class="code" href="classgr__nco.html#adebaf4df7e9d941bef8d15785dfff6cd">adjust_phase</a> (<span class="keywordtype">double</span> delta_phase) {
<a name="l00052"></a>00052 <a class="code" href="classgr__nco.html#a987170cc17a73fbee7174339931a10ec">phase</a> += delta_phase;
<a name="l00053"></a>00053 }
<a name="l00054"></a>00054
<a name="l00055"></a>00055
<a name="l00056"></a>00056 <span class="comment">// angle_rate is in radians / step</span>
<a name="l00057"></a><a class="code" href="classgr__nco.html#a0fb6a20fc445d8c5d204edea99d6c429">00057</a> <span class="keywordtype">void</span> <a class="code" href="classgr__nco.html#a0fb6a20fc445d8c5d204edea99d6c429">set_freq</a> (<span class="keywordtype">double</span> angle_rate){
<a name="l00058"></a>00058 <a class="code" href="classgr__nco.html#a2059238c2da93a471fce526bdd2dc6e2">phase_inc</a> = angle_rate;
<a name="l00059"></a>00059 }
<a name="l00060"></a>00060
<a name="l00061"></a>00061 <span class="comment">// angle_rate is a delta in radians / step</span>
<a name="l00062"></a><a class="code" href="classgr__nco.html#aaaefdc0f44d2d0a75078ccecaa5cf0a0">00062</a> <span class="keywordtype">void</span> <a class="code" href="classgr__nco.html#aaaefdc0f44d2d0a75078ccecaa5cf0a0">adjust_freq</a> (<span class="keywordtype">double</span> delta_angle_rate)
<a name="l00063"></a>00063 {
<a name="l00064"></a>00064 <a class="code" href="classgr__nco.html#a2059238c2da93a471fce526bdd2dc6e2">phase_inc</a> += delta_angle_rate;
<a name="l00065"></a>00065 }
<a name="l00066"></a>00066
<a name="l00067"></a>00067 <span class="comment">// increment current phase angle</span>
<a name="l00068"></a>00068
<a name="l00069"></a><a class="code" href="classgr__nco.html#a81fa5f973481363ccae81e815ec629a3">00069</a> <span class="keywordtype">void</span> <a class="code" href="classgr__nco.html#a81fa5f973481363ccae81e815ec629a3">step</a> ()
<a name="l00070"></a>00070 {
<a name="l00071"></a>00071 <a class="code" href="classgr__nco.html#a987170cc17a73fbee7174339931a10ec">phase</a> += <a class="code" href="classgr__nco.html#a2059238c2da93a471fce526bdd2dc6e2">phase_inc</a>;
<a name="l00072"></a>00072 <span class="keywordflow">if</span> (fabs (<a class="code" href="classgr__nco.html#a987170cc17a73fbee7174339931a10ec">phase</a>) > M_PI){
<a name="l00073"></a>00073
<a name="l00074"></a>00074 <span class="keywordflow">while</span> (<a class="code" href="classgr__nco.html#a987170cc17a73fbee7174339931a10ec">phase</a> > M_PI)
<a name="l00075"></a>00075 <a class="code" href="classgr__nco.html#a987170cc17a73fbee7174339931a10ec">phase</a> -= 2*M_PI;
<a name="l00076"></a>00076
<a name="l00077"></a>00077 <span class="keywordflow">while</span> (<a class="code" href="classgr__nco.html#a987170cc17a73fbee7174339931a10ec">phase</a> < -M_PI)
<a name="l00078"></a>00078 <a class="code" href="classgr__nco.html#a987170cc17a73fbee7174339931a10ec">phase</a> += 2*M_PI;
<a name="l00079"></a>00079 }
<a name="l00080"></a>00080 }
<a name="l00081"></a>00081
<a name="l00082"></a><a class="code" href="classgr__nco.html#a1e43537bf60084cdece096a286e24c36">00082</a> <span class="keywordtype">void</span> <a class="code" href="classgr__nco.html#a81fa5f973481363ccae81e815ec629a3">step</a> (<span class="keywordtype">int</span> n)
<a name="l00083"></a>00083 {
<a name="l00084"></a>00084 <a class="code" href="classgr__nco.html#a987170cc17a73fbee7174339931a10ec">phase</a> += <a class="code" href="classgr__nco.html#a2059238c2da93a471fce526bdd2dc6e2">phase_inc</a> * n;
<a name="l00085"></a>00085 <span class="keywordflow">if</span> (fabs (<a class="code" href="classgr__nco.html#a987170cc17a73fbee7174339931a10ec">phase</a>) > M_PI){
<a name="l00086"></a>00086
<a name="l00087"></a>00087 <span class="keywordflow">while</span> (<a class="code" href="classgr__nco.html#a987170cc17a73fbee7174339931a10ec">phase</a> > M_PI)
<a name="l00088"></a>00088 <a class="code" href="classgr__nco.html#a987170cc17a73fbee7174339931a10ec">phase</a> -= 2*M_PI;
<a name="l00089"></a>00089
<a name="l00090"></a>00090 <span class="keywordflow">while</span> (<a class="code" href="classgr__nco.html#a987170cc17a73fbee7174339931a10ec">phase</a> < -M_PI)
<a name="l00091"></a>00091 <a class="code" href="classgr__nco.html#a987170cc17a73fbee7174339931a10ec">phase</a> += 2*M_PI;
<a name="l00092"></a>00092 }
<a name="l00093"></a>00093 }
<a name="l00094"></a>00094
<a name="l00095"></a>00095 <span class="comment">// units are radians / step</span>
<a name="l00096"></a><a class="code" href="classgr__nco.html#a5152bb2a0d45a3ca2db5e6156e39dabe">00096</a> <span class="keywordtype">double</span> <a class="code" href="classgr__nco.html#a5152bb2a0d45a3ca2db5e6156e39dabe">get_phase</a> ()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> <a class="code" href="classgr__nco.html#a987170cc17a73fbee7174339931a10ec">phase</a>; }
<a name="l00097"></a><a class="code" href="classgr__nco.html#a8681ddce0197120e4f6a84ccca12839e">00097</a> <span class="keywordtype">double</span> <a class="code" href="classgr__nco.html#a8681ddce0197120e4f6a84ccca12839e">get_freq</a> ()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> <a class="code" href="classgr__nco.html#a2059238c2da93a471fce526bdd2dc6e2">phase_inc</a>; }
<a name="l00098"></a>00098
<a name="l00099"></a>00099 <span class="comment">// compute sin and cos for current phase angle</span>
<a name="l00100"></a>00100 <span class="keywordtype">void</span> <a class="code" href="classgr__nco.html#a201edc7a5d1399c3886658ea4b570342">sincos</a> (<span class="keywordtype">float</span> *sinx, <span class="keywordtype">float</span> *cosx) <span class="keyword">const</span>;
<a name="l00101"></a>00101
<a name="l00102"></a>00102 <span class="comment">// compute cos or sin for current phase angle</span>
<a name="l00103"></a><a class="code" href="classgr__nco.html#ab991c608a8d90c9af9ae5ea608acfa6e">00103</a> <span class="keywordtype">float</span> <a class="code" href="classgr__nco.html#ab991c608a8d90c9af9ae5ea608acfa6e">cos</a> ()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> <a class="code" href="classgr__nco.html#ab991c608a8d90c9af9ae5ea608acfa6e">std::cos</a> (<a class="code" href="classgr__nco.html#a987170cc17a73fbee7174339931a10ec">phase</a>); }
<a name="l00104"></a><a class="code" href="classgr__nco.html#ac3b1e9a0be5aecc1538487c41cf51b32">00104</a> <span class="keywordtype">float</span> <a class="code" href="classgr__nco.html#ac3b1e9a0be5aecc1538487c41cf51b32">sin</a> ()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> <a class="code" href="classgr__nco.html#ac3b1e9a0be5aecc1538487c41cf51b32">std::sin</a> (<a class="code" href="classgr__nco.html#a987170cc17a73fbee7174339931a10ec">phase</a>); }
<a name="l00105"></a>00105
<a name="l00106"></a>00106 <span class="comment">// compute a block at a time</span>
<a name="l00107"></a>00107 <span class="keywordtype">void</span> <a class="code" href="classgr__nco.html#ac3b1e9a0be5aecc1538487c41cf51b32">sin</a> (<span class="keywordtype">float</span> *output, <span class="keywordtype">int</span> noutput_items, <span class="keywordtype">double</span> ampl = 1.0);
<a name="l00108"></a>00108 <span class="keywordtype">void</span> <a class="code" href="classgr__nco.html#ab991c608a8d90c9af9ae5ea608acfa6e">cos</a> (<span class="keywordtype">float</span> *output, <span class="keywordtype">int</span> noutput_items, <span class="keywordtype">double</span> ampl = 1.0);
<a name="l00109"></a>00109 <span class="keywordtype">void</span> <a class="code" href="classgr__nco.html#a201edc7a5d1399c3886658ea4b570342">sincos</a> (<a class="code" href="gr__complex_8h.html#aec4bfe41433369afae9327f1b0bc9109">gr_complex</a> *output, <span class="keywordtype">int</span> noutput_items, <span class="keywordtype">double</span> ampl = 1.0);
<a name="l00110"></a>00110 <span class="keywordtype">void</span> <a class="code" href="classgr__nco.html#ac3b1e9a0be5aecc1538487c41cf51b32">sin</a> (<span class="keywordtype">short</span> *output, <span class="keywordtype">int</span> noutput_items, <span class="keywordtype">double</span> ampl = 1.0);
<a name="l00111"></a>00111 <span class="keywordtype">void</span> <a class="code" href="classgr__nco.html#ab991c608a8d90c9af9ae5ea608acfa6e">cos</a> (<span class="keywordtype">short</span> *output, <span class="keywordtype">int</span> noutput_items, <span class="keywordtype">double</span> ampl = 1.0);
<a name="l00112"></a>00112 <span class="keywordtype">void</span> <a class="code" href="classgr__nco.html#ac3b1e9a0be5aecc1538487c41cf51b32">sin</a> (<span class="keywordtype">int</span> *output, <span class="keywordtype">int</span> noutput_items, <span class="keywordtype">double</span> ampl = 1.0);
<a name="l00113"></a>00113 <span class="keywordtype">void</span> <a class="code" href="classgr__nco.html#ab991c608a8d90c9af9ae5ea608acfa6e">cos</a> (<span class="keywordtype">int</span> *output, <span class="keywordtype">int</span> noutput_items, <span class="keywordtype">double</span> ampl = 1.0);
<a name="l00114"></a>00114
<a name="l00115"></a>00115 <span class="keyword">protected</span>:
<a name="l00116"></a><a class="code" href="classgr__nco.html#a987170cc17a73fbee7174339931a10ec">00116</a> <span class="keywordtype">double</span> <a class="code" href="classgr__nco.html#a987170cc17a73fbee7174339931a10ec">phase</a>;
<a name="l00117"></a><a class="code" href="classgr__nco.html#a2059238c2da93a471fce526bdd2dc6e2">00117</a> <span class="keywordtype">double</span> <a class="code" href="classgr__nco.html#a2059238c2da93a471fce526bdd2dc6e2">phase_inc</a>;
<a name="l00118"></a>00118 };
<a name="l00119"></a>00119
<a name="l00120"></a>00120 <span class="keyword">template</span><<span class="keyword">class</span> o_type, <span class="keyword">class</span> i_type>
<a name="l00121"></a>00121 <span class="keywordtype">void</span>
<a name="l00122"></a><a class="code" href="classgr__nco.html#a201edc7a5d1399c3886658ea4b570342">00122</a> <a class="code" href="classgr__nco.html#a201edc7a5d1399c3886658ea4b570342">gr_nco<o_type,i_type>::sincos</a> (<span class="keywordtype">float</span> *sinx, <span class="keywordtype">float</span> *cosx)<span class="keyword"> const</span>
<a name="l00123"></a>00123 <span class="keyword"></span>{
<a name="l00124"></a>00124 <a class="code" href="gr__sincos_8h.html#a1233daa4d05a54c9ce6de62039ca4ddc">gr_sincosf</a> (phase, sinx, cosx);
<a name="l00125"></a>00125 }
<a name="l00126"></a>00126
<a name="l00127"></a>00127 <span class="keyword">template</span><<span class="keyword">class</span> o_type, <span class="keyword">class</span> i_type>
<a name="l00128"></a>00128 <span class="keywordtype">void</span>
<a name="l00129"></a><a class="code" href="classgr__nco.html#a3afb645f64eb06869fe58b3e14badfe2">00129</a> <a class="code" href="classgr__nco.html#ac3b1e9a0be5aecc1538487c41cf51b32">gr_nco<o_type,i_type>::sin</a> (<span class="keywordtype">float</span> *output, <span class="keywordtype">int</span> noutput_items, <span class="keywordtype">double</span> ampl)
<a name="l00130"></a>00130 {
<a name="l00131"></a>00131 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < noutput_items; i++){
<a name="l00132"></a>00132 output[i] = (float)(sin () * ampl);
<a name="l00133"></a>00133 step ();
<a name="l00134"></a>00134 }
<a name="l00135"></a>00135 }
<a name="l00136"></a>00136
<a name="l00137"></a>00137 <span class="keyword">template</span><<span class="keyword">class</span> o_type, <span class="keyword">class</span> i_type>
<a name="l00138"></a>00138 <span class="keywordtype">void</span>
<a name="l00139"></a><a class="code" href="classgr__nco.html#aafb7d1186603337e07998d9db3e204f7">00139</a> <a class="code" href="classgr__nco.html#ab991c608a8d90c9af9ae5ea608acfa6e">gr_nco<o_type,i_type>::cos</a> (<span class="keywordtype">float</span> *output, <span class="keywordtype">int</span> noutput_items, <span class="keywordtype">double</span> ampl)
<a name="l00140"></a>00140 {
<a name="l00141"></a>00141 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < noutput_items; i++){
<a name="l00142"></a>00142 output[i] = (float)(cos () * ampl);
<a name="l00143"></a>00143 step ();
<a name="l00144"></a>00144 }
<a name="l00145"></a>00145 }
<a name="l00146"></a>00146
<a name="l00147"></a>00147 <span class="keyword">template</span><<span class="keyword">class</span> o_type, <span class="keyword">class</span> i_type>
<a name="l00148"></a>00148 <span class="keywordtype">void</span>
<a name="l00149"></a><a class="code" href="classgr__nco.html#a10bbc185b6c9e4a65719a1add98191ae">00149</a> <a class="code" href="classgr__nco.html#ac3b1e9a0be5aecc1538487c41cf51b32">gr_nco<o_type,i_type>::sin</a> (<span class="keywordtype">short</span> *output, <span class="keywordtype">int</span> noutput_items, <span class="keywordtype">double</span> ampl)
<a name="l00150"></a>00150 {
<a name="l00151"></a>00151 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < noutput_items; i++){
<a name="l00152"></a>00152 output[i] = (short)(sin() * ampl);
<a name="l00153"></a>00153 step ();
<a name="l00154"></a>00154 }
<a name="l00155"></a>00155 }
<a name="l00156"></a>00156
<a name="l00157"></a>00157 <span class="keyword">template</span><<span class="keyword">class</span> o_type, <span class="keyword">class</span> i_type>
<a name="l00158"></a>00158 <span class="keywordtype">void</span>
<a name="l00159"></a><a class="code" href="classgr__nco.html#a2f8121120df7ef03f56d1467b251f3bc">00159</a> <a class="code" href="classgr__nco.html#ab991c608a8d90c9af9ae5ea608acfa6e">gr_nco<o_type,i_type>::cos</a> (<span class="keywordtype">short</span> *output, <span class="keywordtype">int</span> noutput_items, <span class="keywordtype">double</span> ampl)
<a name="l00160"></a>00160 {
<a name="l00161"></a>00161 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < noutput_items; i++){
<a name="l00162"></a>00162 output[i] = (short)(cos () * ampl);
<a name="l00163"></a>00163 step ();
<a name="l00164"></a>00164 }
<a name="l00165"></a>00165 }
<a name="l00166"></a>00166
<a name="l00167"></a>00167 <span class="keyword">template</span><<span class="keyword">class</span> o_type, <span class="keyword">class</span> i_type>
<a name="l00168"></a>00168 <span class="keywordtype">void</span>
<a name="l00169"></a><a class="code" href="classgr__nco.html#a874aca305fcec928991648cd74735dbb">00169</a> <a class="code" href="classgr__nco.html#ac3b1e9a0be5aecc1538487c41cf51b32">gr_nco<o_type,i_type>::sin</a> (<span class="keywordtype">int</span> *output, <span class="keywordtype">int</span> noutput_items, <span class="keywordtype">double</span> ampl)
<a name="l00170"></a>00170 {
<a name="l00171"></a>00171 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < noutput_items; i++){
<a name="l00172"></a>00172 output[i] = (int)(sin () * ampl);
<a name="l00173"></a>00173 step ();
<a name="l00174"></a>00174 }
<a name="l00175"></a>00175 }
<a name="l00176"></a>00176
<a name="l00177"></a>00177 <span class="keyword">template</span><<span class="keyword">class</span> o_type, <span class="keyword">class</span> i_type>
<a name="l00178"></a>00178 <span class="keywordtype">void</span>
<a name="l00179"></a><a class="code" href="classgr__nco.html#ad4310e211170d65c0347e38f1f1506f6">00179</a> <a class="code" href="classgr__nco.html#ab991c608a8d90c9af9ae5ea608acfa6e">gr_nco<o_type,i_type>::cos</a> (<span class="keywordtype">int</span> *output, <span class="keywordtype">int</span> noutput_items, <span class="keywordtype">double</span> ampl)
<a name="l00180"></a>00180 {
<a name="l00181"></a>00181 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < noutput_items; i++){
<a name="l00182"></a>00182 output[i] = (int)(cos () * ampl);
<a name="l00183"></a>00183 step ();
<a name="l00184"></a>00184 }
<a name="l00185"></a>00185 }
<a name="l00186"></a>00186
<a name="l00187"></a>00187 <span class="keyword">template</span><<span class="keyword">class</span> o_type, <span class="keyword">class</span> i_type>
<a name="l00188"></a>00188 <span class="keywordtype">void</span>
<a name="l00189"></a><a class="code" href="classgr__nco.html#a9803e92c387c52cba4a1aca3d86aa1eb">00189</a> <a class="code" href="classgr__nco.html#a201edc7a5d1399c3886658ea4b570342">gr_nco<o_type,i_type>::sincos</a> (<a class="code" href="gr__complex_8h.html#aec4bfe41433369afae9327f1b0bc9109">gr_complex</a> *output, <span class="keywordtype">int</span> noutput_items, <span class="keywordtype">double</span> ampl)
<a name="l00190"></a>00190 {
<a name="l00191"></a>00191 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < noutput_items; i++){
<a name="l00192"></a>00192 <span class="keywordtype">float</span> cosx, sinx;
<a name="l00193"></a>00193 sincos (&sinx, &cosx);
<a name="l00194"></a>00194 output[i] = <a class="code" href="gr__complex_8h.html#aec4bfe41433369afae9327f1b0bc9109">gr_complex</a>(cosx * ampl, sinx * ampl);
<a name="l00195"></a>00195 step ();
<a name="l00196"></a>00196 }
<a name="l00197"></a>00197 }
<a name="l00198"></a>00198 <span class="preprocessor">#endif </span><span class="comment">/* _NCO_H_ */</span>
</pre></div></div>
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