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<TITLE>The Synthesis ToolKit in C++ (STK)</TITLE>
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<h1>Twang.h</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="preprocessor">#ifndef STK_TWANG_H</span>
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<a name="l00002"></a>00002 <span class="preprocessor"></span><span class="preprocessor">#define STK_TWANG_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 "Stk.h"</span>
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<a name="l00005"></a>00005 <span class="preprocessor">#include "DelayA.h"</span>
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<a name="l00006"></a>00006 <span class="preprocessor">#include "DelayL.h"</span>
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<a name="l00007"></a>00007 <span class="preprocessor">#include "Fir.h"</span>
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<a name="l00008"></a>00008
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<a name="l00009"></a>00009 <span class="keyword">namespace </span>stk {
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<a name="l00010"></a>00010
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<a name="l00011"></a>00011 <span class="comment">/***************************************************/</span>
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<a name="l00032"></a>00032 <span class="comment">/***************************************************/</span>
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<a name="l00033"></a>00033
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<a name="l00034"></a><a class="code" href="classstk_1_1Twang.html">00034</a> <span class="keyword">class </span><a class="code" href="classstk_1_1Twang.html" title="STK enhanced plucked string class.">Twang</a> : <span class="keyword">public</span> <a class="code" href="classstk_1_1Stk.html" title="STK base class.">Stk</a>
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<a name="l00035"></a>00035 {
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<a name="l00036"></a>00036 <span class="keyword">public</span>:
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<a name="l00038"></a>00038 <a class="code" href="classstk_1_1Twang.html#a813e99ee79974707a3afbfcab963c086" title="Class constructor, taking the lowest desired playing frequency.">Twang</a>( StkFloat lowestFrequency = 50.0 );
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<a name="l00039"></a>00039
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<a name="l00041"></a>00041 <span class="keywordtype">void</span> <a class="code" href="classstk_1_1Twang.html#a7cdd4bf2e486239429f6d4f0f277cea9" title="Reset and clear all internal state.">clear</a>( <span class="keywordtype">void</span> );
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<a name="l00042"></a>00042
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<a name="l00044"></a>00044 <span class="keywordtype">void</span> <a class="code" href="classstk_1_1Twang.html#ae27aa429cbf49f0dd60f0cc6ef41c832" title="Set the delayline parameters to allow frequencies as low as specified.">setLowestFrequency</a>( StkFloat frequency );
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<a name="l00045"></a>00045
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<a name="l00047"></a>00047 <span class="keywordtype">void</span> <a class="code" href="classstk_1_1Twang.html#a0043b9d374b73b6660ec2d79475d602c" title="Set the delayline parameters for a particular frequency.">setFrequency</a>( StkFloat frequency );
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<a name="l00048"></a>00048
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<a name="l00050"></a>00050 <span class="keywordtype">void</span> <a class="code" href="classstk_1_1Twang.html#a48008e3cd55dad6ee846b47ab32f993f" title="Set the pluck or &quot;excitation&quot; position along the string (0.0 - 1.0).">setPluckPosition</a>( StkFloat position );
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<a name="l00051"></a>00051
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<a name="l00053"></a>00053
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<a name="l00059"></a>00059 <span class="keywordtype">void</span> <a class="code" href="classstk_1_1Twang.html#ad7921c51f38b4e6e32d7db48cc101068" title="Set the nominal loop gain.">setLoopGain</a>( StkFloat loopGain );
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<a name="l00060"></a>00060
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<a name="l00062"></a>00062
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<a name="l00067"></a>00067 <span class="keywordtype">void</span> <a class="code" href="classstk_1_1Twang.html#a7076c25dd3a06262b3bf927bc64bf89e" title="Set the loop filter coefficients.">setLoopFilter</a>( std::vector<StkFloat> coefficients );
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<a name="l00068"></a>00068
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<a name="l00070"></a>00070 <span class="comment">//const StkFrames& lastFrame( void ) const { return lastFrame_; };</span>
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<a name="l00071"></a>00071
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<a name="l00073"></a>00073 <span class="comment">// StkFloat lastOut( void ) { return lastFrame_[0]; };</span>
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<a name="l00074"></a><a class="code" href="classstk_1_1Twang.html#aa25943e277f1cc396074d6be2969f0be">00074</a> StkFloat <a class="code" href="classstk_1_1Twang.html#aa25943e277f1cc396074d6be2969f0be" title="Return an StkFrames reference to the last output sample frame.">lastOut</a>( <span class="keywordtype">void</span> ) { <span class="keywordflow">return</span> lastOutput_; };
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<a name="l00075"></a>00075
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<a name="l00077"></a>00077 StkFloat <a class="code" href="classstk_1_1Twang.html#a3441ff449e3f7a451873e67d4c680ce9" title="Compute and return one output sample.">tick</a>( StkFloat input );
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<a name="l00078"></a>00078
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<a name="l00080"></a>00080
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<a name="l00088"></a>00088 <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_1Twang.html#a3441ff449e3f7a451873e67d4c680ce9" title="Compute and return one output sample.">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="l00089"></a>00089
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<a name="l00091"></a>00091
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<a name="l00099"></a>00099 <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_1Twang.html#a3441ff449e3f7a451873e67d4c680ce9" title="Compute and return one output sample.">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="l00100"></a>00100
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<a name="l00101"></a>00101 <span class="keyword">protected</span>:
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<a name="l00102"></a>00102
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<a name="l00103"></a>00103 <a class="code" href="classstk_1_1DelayA.html" title="STK allpass interpolating delay line class.">DelayA</a> delayLine_;
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<a name="l00104"></a>00104 <a class="code" href="classstk_1_1DelayL.html" title="STK linear interpolating delay line class.">DelayL</a> combDelay_;
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<a name="l00105"></a>00105 <a class="code" href="classstk_1_1Fir.html" title="STK general finite impulse response filter class.">Fir</a> loopFilter_;
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<a name="l00106"></a>00106
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<a name="l00107"></a>00107 StkFloat lastOutput_;
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<a name="l00108"></a>00108 StkFloat frequency_;
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<a name="l00109"></a>00109 StkFloat loopGain_;
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<a name="l00110"></a>00110 StkFloat pluckPosition_;
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<a name="l00111"></a>00111 };
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<a name="l00112"></a>00112
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<a name="l00113"></a><a class="code" href="classstk_1_1Twang.html#a3441ff449e3f7a451873e67d4c680ce9">00113</a> <span class="keyword">inline</span> StkFloat <a class="code" href="classstk_1_1Twang.html#a3441ff449e3f7a451873e67d4c680ce9" title="Compute and return one output sample.">Twang :: tick</a>( StkFloat input )
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<a name="l00114"></a>00114 {
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<a name="l00115"></a>00115 lastOutput_ = delayLine_.<a class="code" href="classstk_1_1DelayA.html#ae602abe91560fb5f141db52333359b74" title="Input one sample to the filter and return one output.">tick</a>( input + loopFilter_.<a class="code" href="classstk_1_1Fir.html#afc5fd95f6bf72edaf4ee3060ca947793" title="Input one sample to the filter and return one output.">tick</a>( delayLine_.<a class="code" href="classstk_1_1DelayA.html#a4372d0e178af1cb6ca465affddfb1566" title="Return the last computed output value.">lastOut</a>() ) );
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<a name="l00116"></a>00116 lastOutput_ -= combDelay_.<a class="code" href="classstk_1_1DelayL.html#a1d01bbaf40cc20a0b70241bb8072da7f" title="Input one sample to the filter and return one output.">tick</a>( lastOutput_ ); <span class="comment">// comb filtering on output</span>
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<a name="l00117"></a>00117 lastOutput_ *= 0.5;
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<a name="l00118"></a>00118
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<a name="l00119"></a>00119 <span class="keywordflow">return</span> lastOutput_;
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<a name="l00120"></a>00120 }
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<a name="l00121"></a>00121
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<a name="l00122"></a><a class="code" href="classstk_1_1Twang.html#ae9e770c446e1459a5e89c0bc8285f5e3">00122</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_1Twang.html#a3441ff449e3f7a451873e67d4c680ce9" title="Compute and return one output sample.">Twang :: 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="l00123"></a>00123 {
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<a name="l00124"></a>00124 <span class="preprocessor">#if defined(_STK_DEBUG_)</span>
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<a name="l00125"></a>00125 <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="l00126"></a>00126 oStream_ << <span class="stringliteral">"Twang::tick(): channel and StkFrames arguments are incompatible!"</span>;
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<a name="l00127"></a>00127 <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="l00128"></a>00128 }
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<a name="l00129"></a>00129 <span class="preprocessor">#endif</span>
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<a name="l00130"></a>00130 <span class="preprocessor"></span>
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<a name="l00131"></a>00131 StkFloat *samples = &frames[channel];
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<a name="l00132"></a>00132 <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="l00133"></a>00133 <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="l00134"></a>00134 *samples = <a class="code" href="classstk_1_1Twang.html#a3441ff449e3f7a451873e67d4c680ce9" title="Compute and return one output sample.">tick</a>( *samples );
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<a name="l00135"></a>00135
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<a name="l00136"></a>00136 <span class="keywordflow">return</span> frames;
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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><a class="code" href="classstk_1_1Twang.html#a089ff55338a22647d94665d6adbeb7ae">00139</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_1Twang.html#a3441ff449e3f7a451873e67d4c680ce9" title="Compute and return one output sample.">Twang :: 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="l00140"></a>00140 {
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<a name="l00141"></a>00141 <span class="preprocessor">#if defined(_STK_DEBUG_)</span>
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<a name="l00142"></a>00142 <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="l00143"></a>00143 oStream_ << <span class="stringliteral">"Twang::tick(): channel and StkFrames arguments are incompatible!"</span>;
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<a name="l00144"></a>00144 <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="l00145"></a>00145 }
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<a name="l00146"></a>00146 <span class="preprocessor">#endif</span>
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<a name="l00147"></a>00147 <span class="preprocessor"></span>
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<a name="l00148"></a>00148 StkFloat *iSamples = &iFrames[iChannel];
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<a name="l00149"></a>00149 StkFloat *oSamples = &oFrames[oChannel];
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<a name="l00150"></a>00150 <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="l00151"></a>00151 <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="l00152"></a>00152 *oSamples = <a class="code" href="classstk_1_1Twang.html#a3441ff449e3f7a451873e67d4c680ce9" title="Compute and return one output sample.">tick</a>( *iSamples );
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<a name="l00153"></a>00153
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<a name="l00154"></a>00154 <span class="keywordflow">return</span> iFrames;
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<a name="l00155"></a>00155 }
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<a name="l00156"></a>00156
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<a name="l00157"></a>00157 } <span class="comment">// stk namespace</span>
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<a name="l00158"></a>00158
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<a name="l00159"></a>00159 <span class="preprocessor">#endif</span>
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<a name="l00160"></a>00160 <span class="preprocessor"></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>©1995-2012 Perry R. Cook and Gary P. Scavone. All Rights Reserved.</td></tr>
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