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<div id="projectname">libsdr
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 <span id="projectnumber">0.1.0</span>
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<div id="projectbrief">A simple SDR library</div>
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="preprocessor">#ifndef __SDR_MATH_HH__</span></div>
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<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="preprocessor">#define __SDR_MATH_HH__</span></div>
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<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> </div>
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<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="preprocessor">#include <inttypes.h></span></div>
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<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> </div>
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<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="keyword">namespace </span><a class="code" href="namespacesdr.html">sdr</a> {</div>
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<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> </div>
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<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="keyword">template</span> <<span class="keyword">class</span> iScalar, <span class="keyword">class</span> oScalar> oScalar fast_atan2(iScalar a, iScalar b);</div>
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<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> </div>
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<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="keyword">template</span> <> <span class="keyword">inline</span> int16_t fast_atan2<int8_t, int16_t>(int8_t a, int8_t b) {</div>
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<div class="line"><a name="l00013"></a><span class="lineno"> 13</span>  <span class="keyword">const</span> int32_t pi4 = (1<<12);</div>
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<div class="line"><a name="l00014"></a><span class="lineno"> 14</span>  <span class="keyword">const</span> int32_t pi34 = 3*(1<<12);</div>
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<div class="line"><a name="l00015"></a><span class="lineno"> 15</span>  int32_t aabs, angle;</div>
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<div class="line"><a name="l00016"></a><span class="lineno"> 16</span>  <span class="keywordflow">if</span> ((0 == a) && (0 == b)) { <span class="keywordflow">return</span> 0; }</div>
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<div class="line"><a name="l00017"></a><span class="lineno"> 17</span>  aabs = (a >= 0) ? a : -a;</div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span>  <span class="keywordflow">if</span> (b >= 0) { angle = pi4 - pi4*(b-aabs) / (b+aabs); }</div>
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<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>  <span class="keywordflow">else</span> { angle = pi34 - pi4*(b+aabs) / (aabs-b); }</div>
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<div class="line"><a name="l00020"></a><span class="lineno"> 20</span>  <span class="keywordflow">return</span> (a >= 0) ? angle : -angle;</div>
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<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> }</div>
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<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> </div>
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<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="keyword">template</span> <> <span class="keyword">inline</span> int16_t fast_atan2<uint8_t, int16_t>(uint8_t ua, uint8_t ub) {</div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  int8_t a = (int16_t(ua)-(1<<7));</div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  int8_t b = (int16_t(ub)-(1<<7));</div>
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<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  <span class="keywordflow">return</span> fast_atan2<int8_t, int16_t>(a,b);</div>
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<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> }</div>
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<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> </div>
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<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="keyword">template</span> <> <span class="keyword">inline</span> int16_t fast_atan2<int16_t, int16_t>(int16_t a, int16_t b) {</div>
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<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  <span class="comment">//return (1<<15)*(std::atan2(float(a), float(b))/M_PI);</span></div>
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<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  <span class="keyword">const</span> int32_t pi4 = (1<<12);</div>
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<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  <span class="keyword">const</span> int32_t pi34 = 3*(1<<12);</div>
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<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  int32_t aabs, angle;</div>
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<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  <span class="keywordflow">if</span> ((0 == a) && (0 == b)) { <span class="keywordflow">return</span> 0; }</div>
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<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  aabs = (a >= 0) ? a : -a;</div>
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<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  <span class="keywordflow">if</span> (b >= 0) { angle = pi4 - pi4*(b-aabs) / (b+aabs); }</div>
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<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  <span class="keywordflow">else</span> { angle = pi34 - pi4*(b+aabs) / (aabs-b); }</div>
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<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  <span class="keywordflow">return</span> (a >= 0) ? angle : -angle;</div>
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<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> }</div>
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<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> </div>
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<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> </div>
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<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> }</div>
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<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="preprocessor">#endif // MATH_HH</span></div>
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<div class="ttc" id="namespacesdr_html"><div class="ttname"><a href="namespacesdr.html">sdr</a></div><div class="ttdef"><b>Definition:</b> autocast.hh:8</div></div>
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