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<TITLE>The Synthesis ToolKit in C++ (STK)</TITLE>
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<a class="el" href="dir_000000.html">include</a></div>
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<h1>BiQuad.h</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/***************************************************/</span>
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<a name="l00013"></a>00013 <span class="comment">/***************************************************/</span>
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<a name="l00014"></a>00014
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<a name="l00015"></a>00015 <span class="preprocessor">#ifndef STK_BIQUAD_H</span>
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<a name="l00016"></a>00016 <span class="preprocessor"></span><span class="preprocessor">#define STK_BIQUAD_H</span>
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<a name="l00017"></a>00017 <span class="preprocessor"></span>
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<a name="l00018"></a>00018 <span class="preprocessor">#include "Filter.h"</span>
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<a name="l00019"></a>00019
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<a name="l00020"></a><a class="code" href="classBiQuad.html">00020</a> <span class="keyword">class </span><a class="code" href="classBiQuad.html">BiQuad</a> : <span class="keyword">protected</span> <a class="code" href="classFilter.html">Filter</a>
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<a name="l00021"></a>00021 {
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<a name="l00022"></a>00022 <span class="keyword">public</span>:
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<a name="l00023"></a>00023
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<a name="l00025"></a>00025 <a class="code" href="classBiQuad.html#a0">BiQuad</a>();
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<a name="l00026"></a>00026
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<a name="l00028"></a>00028 <span class="keyword">virtual</span> <a class="code" href="classBiQuad.html#a1">~BiQuad</a>();
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<a name="l00029"></a>00029
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<a name="l00031"></a><a class="code" href="classBiQuad.html#a2">00031</a> <span class="keywordtype">void</span> <a class="code" href="classBiQuad.html#a2">ignoreSampleRateChange</a>( <span class="keywordtype">bool</span> ignore = <span class="keyword">true</span> ) { ignoreSampleRateChange_ = ignore; };
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<a name="l00032"></a>00032
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<a name="l00034"></a>00034 <span class="keywordtype">void</span> <a class="code" href="classBiQuad.html#a3">clear</a>(<span class="keywordtype">void</span>);
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<a name="l00035"></a>00035
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<a name="l00037"></a>00037 <span class="keywordtype">void</span> <a class="code" href="classBiQuad.html#a4">setB0</a>(StkFloat b0);
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<a name="l00038"></a>00038
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<a name="l00040"></a>00040 <span class="keywordtype">void</span> <a class="code" href="classBiQuad.html#a5">setB1</a>(StkFloat b1);
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<a name="l00041"></a>00041
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<a name="l00043"></a>00043 <span class="keywordtype">void</span> <a class="code" href="classBiQuad.html#a6">setB2</a>(StkFloat b2);
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<a name="l00044"></a>00044
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<a name="l00046"></a>00046 <span class="keywordtype">void</span> <a class="code" href="classBiQuad.html#a7">setA1</a>(StkFloat a1);
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<a name="l00047"></a>00047
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<a name="l00049"></a>00049 <span class="keywordtype">void</span> <a class="code" href="classBiQuad.html#a8">setA2</a>(StkFloat a2);
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<a name="l00050"></a>00050
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<a name="l00052"></a>00052
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<a name="l00063"></a>00063 <span class="keywordtype">void</span> <a class="code" href="classBiQuad.html#a9">setResonance</a>(StkFloat frequency, StkFloat radius, <span class="keywordtype">bool</span> normalize = <span class="keyword">false</span>);
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<a name="l00064"></a>00064
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<a name="l00066"></a>00066
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<a name="l00072"></a>00072 <span class="keywordtype">void</span> <a class="code" href="classBiQuad.html#a10">setNotch</a>(StkFloat frequency, StkFloat radius);
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<a name="l00073"></a>00073
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<a name="l00075"></a>00075
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<a name="l00081"></a>00081 <span class="keywordtype">void</span> <a class="code" href="classBiQuad.html#a11">setEqualGainZeroes</a>();
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<a name="l00082"></a>00082
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<a name="l00084"></a>00084
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<a name="l00088"></a>00088 <span class="keywordtype">void</span> <a class="code" href="classBiQuad.html#a12">setGain</a>(StkFloat gain);
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<a name="l00089"></a>00089
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<a name="l00091"></a>00091 StkFloat <a class="code" href="classBiQuad.html#a13">getGain</a>(<span class="keywordtype">void</span>) <span class="keyword">const</span>;
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<a name="l00092"></a>00092
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<a name="l00094"></a>00094 StkFloat <a class="code" href="classBiQuad.html#a14">lastOut</a>(<span class="keywordtype">void</span>) <span class="keyword">const</span>;
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<a name="l00095"></a>00095
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<a name="l00097"></a>00097 <span class="keyword">virtual</span> StkFloat <a class="code" href="classBiQuad.html#a15">tick</a>(StkFloat sample);
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<a name="l00098"></a>00098
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<a name="l00100"></a>00100
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<a name="l00106"></a>00106 <span class="keyword">virtual</span> <a class="code" href="classStkFrames.html">StkFrames</a>& <a class="code" href="classBiQuad.html#a15">tick</a>( <a class="code" href="classStkFrames.html">StkFrames</a>& frames, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> channel = 0 );
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<a name="l00107"></a>00107
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<a name="l00108"></a>00108 <span class="keyword">protected</span>:
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<a name="l00109"></a>00109
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<a name="l00110"></a>00110 <span class="comment">// This function must be implemented in all subclasses. It is used</span>
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<a name="l00111"></a>00111 <span class="comment">// to get around a C++ problem with overloaded virtual functions.</span>
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<a name="l00112"></a>00112 <span class="keyword">virtual</span> StkFloat computeSample( StkFloat input );
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<a name="l00113"></a>00113 <span class="keyword">virtual</span> <span class="keywordtype">void</span> sampleRateChanged( StkFloat newRate, StkFloat oldRate );
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<a name="l00114"></a>00114 };
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<a name="l00115"></a>00115
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<a name="l00116"></a>00116 <span class="keyword">inline</span> StkFloat BiQuad :: computeSample( StkFloat input )
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<a name="l00117"></a>00117 {
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<a name="l00118"></a>00118 inputs_[0] = gain_ * input;
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<a name="l00119"></a>00119 outputs_[0] = b_[0] * inputs_[0] + b_[1] * inputs_[1] + b_[2] * inputs_[2];
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<a name="l00120"></a>00120 outputs_[0] -= a_[2] * outputs_[2] + a_[1] * outputs_[1];
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<a name="l00121"></a>00121 inputs_[2] = inputs_[1];
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<a name="l00122"></a>00122 inputs_[1] = inputs_[0];
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<a name="l00123"></a>00123 outputs_[2] = outputs_[1];
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<a name="l00124"></a>00124 outputs_[1] = outputs_[0];
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<a name="l00125"></a>00125
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<a name="l00126"></a>00126 <span class="keywordflow">return</span> outputs_[0];
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<a name="l00127"></a>00127 }
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<a name="l00128"></a>00128
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<a name="l00129"></a><a class="code" href="classBiQuad.html#a15">00129</a> <span class="keyword">inline</span> StkFloat <a class="code" href="classBiQuad.html#a15">BiQuad :: tick</a>( StkFloat input )
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<a name="l00130"></a>00130 {
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<a name="l00131"></a>00131 <span class="keywordflow">return</span> this->computeSample( input );
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<a name="l00132"></a>00132 }
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<a name="l00133"></a>00133
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<a name="l00134"></a><a class="code" href="classBiQuad.html#a16">00134</a> <span class="keyword">inline</span> <a class="code" href="classStkFrames.html">StkFrames</a>& <a class="code" href="classBiQuad.html#a15">BiQuad :: tick</a>( <a class="code" href="classStkFrames.html">StkFrames</a>& frames, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> channel )
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<a name="l00135"></a>00135 {
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<a name="l00136"></a>00136 <span class="keywordflow">return</span> <a class="code" href="classFilter.html#a10">Filter::tick</a>( frames, channel );
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<a name="l00137"></a>00137 }
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<a name="l00138"></a>00138
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<a name="l00139"></a>00139 <span class="preprocessor">#endif</span>
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</pre></div><HR>
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<table>
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<tr><td><A HREF="http://ccrma.stanford.edu/software/stk/"><I>The Synthesis ToolKit in C++ (STK)</I></A></td></tr>
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<tr><td>©1995-2007 Perry R. Cook and Gary P. Scavone. All Rights Reserved.</td></tr>
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