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<h1>ReedTable.h</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="preprocessor">#ifndef STK_REEDTABLE_H</span>
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<a name="l00002"></a>00002 <span class="preprocessor"></span><span class="preprocessor">#define STK_REEDTABLE_H</span>
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<a name="l00003"></a>00003 <span class="preprocessor"></span>
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<a name="l00004"></a>00004 <span class="preprocessor">#include "Function.h"</span>
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<a name="l00005"></a>00005
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<a name="l00006"></a>00006 <span class="keyword">namespace </span>stk {
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<a name="l00007"></a>00007
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<a name="l00008"></a>00008 <span class="comment">/***************************************************/</span>
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<a name="l00025"></a>00025 <span class="comment">/***************************************************/</span>
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<a name="l00026"></a>00026
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<a name="l00027"></a><a class="code" href="classstk_1_1ReedTable.html">00027</a> <span class="keyword">class </span><a class="code" href="classstk_1_1ReedTable.html" title="STK reed table class.">ReedTable</a> : <span class="keyword">public</span> <a class="code" href="classstk_1_1Function.html" title="STK abstract function parent class.">Function</a>
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<a name="l00028"></a>00028 {
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<a name="l00029"></a>00029 <span class="keyword">public</span>:
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<a name="l00031"></a><a class="code" href="classstk_1_1ReedTable.html#a138db7619ec28a4feeaf2a00988e4f0d">00031</a> <a class="code" href="classstk_1_1ReedTable.html#a138db7619ec28a4feeaf2a00988e4f0d" title="Default constructor.">ReedTable</a>( <span class="keywordtype">void</span> ) : offset_(0.6), slope_(-0.8) {};
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<a name="l00032"></a>00032
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<a name="l00034"></a>00034
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<a name="l00039"></a><a class="code" href="classstk_1_1ReedTable.html#ab40ffd675bd7242a210e8630f8919556">00039</a> <span class="keywordtype">void</span> <a class="code" href="classstk_1_1ReedTable.html#ab40ffd675bd7242a210e8630f8919556" title="Set the table offset value.">setOffset</a>( StkFloat offset ) { offset_ = offset; };
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<a name="l00040"></a>00040
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<a name="l00042"></a>00042
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<a name="l00047"></a><a class="code" href="classstk_1_1ReedTable.html#a968a97400ec6bd424634ff377fc6417a">00047</a> <span class="keywordtype">void</span> <a class="code" href="classstk_1_1ReedTable.html#a968a97400ec6bd424634ff377fc6417a" title="Set the table slope value.">setSlope</a>( StkFloat slope ) { slope_ = slope; };
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<a name="l00048"></a>00048
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<a name="l00050"></a>00050 StkFloat <a class="code" href="classstk_1_1ReedTable.html#a3c1607ed5712e2ab010d8c5e55e431f2" title="Take one sample input and map to one sample of output.">tick</a>( StkFloat input );
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<a name="l00051"></a>00051
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<a name="l00053"></a>00053
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<a name="l00061"></a>00061 <a class="code" href="classstk_1_1StkFrames.html" title="An STK class to handle vectorized audio data.">StkFrames</a>& <a class="code" href="classstk_1_1ReedTable.html#a3c1607ed5712e2ab010d8c5e55e431f2" title="Take one sample input and map to one sample of output.">tick</a>( <a class="code" href="classstk_1_1StkFrames.html" title="An STK class to handle vectorized audio data.">StkFrames</a>& frames, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> channel = 0 );
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<a name="l00062"></a>00062
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<a name="l00064"></a>00064
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<a name="l00072"></a>00072 <a class="code" href="classstk_1_1StkFrames.html" title="An STK class to handle vectorized audio data.">StkFrames</a>& <a class="code" href="classstk_1_1ReedTable.html#a3c1607ed5712e2ab010d8c5e55e431f2" title="Take one sample input and map to one sample of output.">tick</a>( <a class="code" href="classstk_1_1StkFrames.html" title="An STK class to handle vectorized audio data.">StkFrames</a>& iFrames, <a class="code" href="classstk_1_1StkFrames.html" title="An STK class to handle vectorized audio data.">StkFrames</a> &oFrames, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> iChannel = 0, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> oChannel = 0 );
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<a name="l00073"></a>00073
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<a name="l00074"></a>00074 <span class="keyword">protected</span>:
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<a name="l00075"></a>00075
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<a name="l00076"></a>00076 StkFloat offset_;
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<a name="l00077"></a>00077 StkFloat slope_;
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<a name="l00078"></a>00078
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<a name="l00079"></a>00079 };
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<a name="l00080"></a>00080
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<a name="l00081"></a><a class="code" href="classstk_1_1ReedTable.html#a3c1607ed5712e2ab010d8c5e55e431f2">00081</a> <span class="keyword">inline</span> StkFloat <a class="code" href="classstk_1_1ReedTable.html#a3c1607ed5712e2ab010d8c5e55e431f2" title="Take one sample input and map to one sample of output.">ReedTable :: tick</a>( StkFloat input )
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<a name="l00082"></a>00082 {
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<a name="l00083"></a>00083 <span class="comment">// The input is differential pressure across the reed.</span>
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<a name="l00084"></a>00084 lastFrame_[0] = offset_ + (slope_ * input);
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<a name="l00085"></a>00085
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<a name="l00086"></a>00086 <span class="comment">// If output is > 1, the reed has slammed shut and the</span>
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<a name="l00087"></a>00087 <span class="comment">// reflection function value saturates at 1.0.</span>
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<a name="l00088"></a>00088 <span class="keywordflow">if</span> ( lastFrame_[0] > 1.0) lastFrame_[0] = (StkFloat) 1.0;
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<a name="l00089"></a>00089
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<a name="l00090"></a>00090 <span class="comment">// This is nearly impossible in a physical system, but</span>
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<a name="l00091"></a>00091 <span class="comment">// a reflection function value of -1.0 corresponds to</span>
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<a name="l00092"></a>00092 <span class="comment">// an open end (and no discontinuity in bore profile).</span>
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<a name="l00093"></a>00093 <span class="keywordflow">if</span> ( lastFrame_[0] < -1.0) lastFrame_[0] = (StkFloat) -1.0;
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<a name="l00094"></a>00094
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<a name="l00095"></a>00095 <span class="keywordflow">return</span> lastFrame_[0];
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<a name="l00096"></a>00096 }
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<a name="l00097"></a>00097
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<a name="l00098"></a><a class="code" href="classstk_1_1ReedTable.html#a3455fa2dedb2c86fc825ec48296822be">00098</a> <span class="keyword">inline</span> <a class="code" href="classstk_1_1StkFrames.html" title="An STK class to handle vectorized audio data.">StkFrames</a>& <a class="code" href="classstk_1_1ReedTable.html#a3c1607ed5712e2ab010d8c5e55e431f2" title="Take one sample input and map to one sample of output.">ReedTable :: tick</a>( <a class="code" href="classstk_1_1StkFrames.html" title="An STK class to handle vectorized audio data.">StkFrames</a>& frames, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> channel )
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<a name="l00099"></a>00099 {
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<a name="l00100"></a>00100 <span class="preprocessor">#if defined(_STK_DEBUG_)</span>
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<a name="l00101"></a>00101 <span class="preprocessor"></span> <span class="keywordflow">if</span> ( channel >= frames.<a class="code" href="classstk_1_1StkFrames.html#aec7ef9c46675a24111aa6e2fda3ba870" title="Return the number of channels represented by the data.">channels</a>() ) {
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<a name="l00102"></a>00102 oStream_ << <span class="stringliteral">"ReedTable::tick(): channel and StkFrames arguments are incompatible!"</span>;
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<a name="l00103"></a>00103 <a class="code" href="classstk_1_1Stk.html#a48ac73a0d8ca28445ba1a054e1f061ff" title="Static function for error reporting and handling using c-strings.">handleError</a>( StkError::FUNCTION_ARGUMENT );
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<a name="l00104"></a>00104 }
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<a name="l00105"></a>00105 <span class="preprocessor">#endif</span>
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<a name="l00106"></a>00106 <span class="preprocessor"></span>
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<a name="l00107"></a>00107 StkFloat *samples = &frames[channel];
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<a name="l00108"></a>00108 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> hop = frames.<a class="code" href="classstk_1_1StkFrames.html#aec7ef9c46675a24111aa6e2fda3ba870" title="Return the number of channels represented by the data.">channels</a>();
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<a name="l00109"></a>00109 <span class="keywordflow">for</span> ( <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i=0; i<frames.<a class="code" href="classstk_1_1StkFrames.html#a05b1ab6fa750a8221a7d65c30e0cdab9" title="Return the number of sample frames represented by the data.">frames</a>(); i++, samples += hop ) {
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<a name="l00110"></a>00110 *samples = offset_ + (slope_ * *samples);
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<a name="l00111"></a>00111 <span class="keywordflow">if</span> ( *samples > 1.0) *samples = 1.0;
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<a name="l00112"></a>00112 <span class="keywordflow">if</span> ( *samples < -1.0) *samples = -1.0;
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<a name="l00113"></a>00113 }
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<a name="l00114"></a>00114
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<a name="l00115"></a>00115 lastFrame_[0] = *(samples-hop);
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<a name="l00116"></a>00116 <span class="keywordflow">return</span> frames;
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<a name="l00117"></a>00117 }
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<a name="l00118"></a>00118
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<a name="l00119"></a><a class="code" href="classstk_1_1ReedTable.html#ae682fdc0a6ec68a9f858f5cd6889113d">00119</a> <span class="keyword">inline</span> <a class="code" href="classstk_1_1StkFrames.html" title="An STK class to handle vectorized audio data.">StkFrames</a>& <a class="code" href="classstk_1_1ReedTable.html#a3c1607ed5712e2ab010d8c5e55e431f2" title="Take one sample input and map to one sample of output.">ReedTable :: tick</a>( <a class="code" href="classstk_1_1StkFrames.html" title="An STK class to handle vectorized audio data.">StkFrames</a>& iFrames, <a class="code" href="classstk_1_1StkFrames.html" title="An STK class to handle vectorized audio data.">StkFrames</a>& oFrames, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> iChannel, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> oChannel )
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<a name="l00120"></a>00120 {
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<a name="l00121"></a>00121 <span class="preprocessor">#if defined(_STK_DEBUG_)</span>
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<a name="l00122"></a>00122 <span class="preprocessor"></span> <span class="keywordflow">if</span> ( iChannel >= iFrames.<a class="code" href="classstk_1_1StkFrames.html#aec7ef9c46675a24111aa6e2fda3ba870" title="Return the number of channels represented by the data.">channels</a>() || oChannel >= oFrames.<a class="code" href="classstk_1_1StkFrames.html#aec7ef9c46675a24111aa6e2fda3ba870" title="Return the number of channels represented by the data.">channels</a>() ) {
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<a name="l00123"></a>00123 oStream_ << <span class="stringliteral">"ReedTable::tick(): channel and StkFrames arguments are incompatible!"</span>;
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<a name="l00124"></a>00124 <a class="code" href="classstk_1_1Stk.html#a48ac73a0d8ca28445ba1a054e1f061ff" title="Static function for error reporting and handling using c-strings.">handleError</a>( StkError::FUNCTION_ARGUMENT );
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<a name="l00125"></a>00125 }
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<a name="l00126"></a>00126 <span class="preprocessor">#endif</span>
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<a name="l00127"></a>00127 <span class="preprocessor"></span>
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<a name="l00128"></a>00128 StkFloat *iSamples = &iFrames[iChannel];
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<a name="l00129"></a>00129 StkFloat *oSamples = &oFrames[oChannel];
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<a name="l00130"></a>00130 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> iHop = iFrames.<a class="code" href="classstk_1_1StkFrames.html#aec7ef9c46675a24111aa6e2fda3ba870" title="Return the number of channels represented by the data.">channels</a>(), oHop = oFrames.<a class="code" href="classstk_1_1StkFrames.html#aec7ef9c46675a24111aa6e2fda3ba870" title="Return the number of channels represented by the data.">channels</a>();
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<a name="l00131"></a>00131 <span class="keywordflow">for</span> ( <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i=0; i<iFrames.<a class="code" href="classstk_1_1StkFrames.html#a05b1ab6fa750a8221a7d65c30e0cdab9" title="Return the number of sample frames represented by the data.">frames</a>(); i++, iSamples += iHop, oSamples += oHop ) {
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<a name="l00132"></a>00132 *oSamples = offset_ + (slope_ * *iSamples);
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<a name="l00133"></a>00133 <span class="keywordflow">if</span> ( *oSamples > 1.0) *oSamples = 1.0;
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<a name="l00134"></a>00134 <span class="keywordflow">if</span> ( *oSamples < -1.0) *oSamples = -1.0;
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<a name="l00135"></a>00135 }
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<a name="l00136"></a>00136
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<a name="l00137"></a>00137 lastFrame_[0] = *(oSamples-oHop);
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<a name="l00138"></a>00138 <span class="keywordflow">return</span> iFrames;
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<a name="l00139"></a>00139 }
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<a name="l00140"></a>00140
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<a name="l00141"></a>00141 } <span class="comment">// stk namespace</span>
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<a name="l00142"></a>00142
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<a name="l00143"></a>00143 <span class="preprocessor">#endif</span>
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</pre></div></div>
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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>©1995-2011 Perry R. Cook and Gary P. Scavone. All Rights Reserved.</td></tr>
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