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<TITLE>The Synthesis ToolKit in C++ (STK)</TITLE>
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<h1>Bowed.h</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="preprocessor">#ifndef STK_BOWED_H</span>
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<a name="l00002"></a>00002 <span class="preprocessor"></span><span class="preprocessor">#define STK_BOWED_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 "Instrmnt.h"</span>
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<a name="l00005"></a>00005 <span class="preprocessor">#include "DelayL.h"</span>
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<a name="l00006"></a>00006 <span class="preprocessor">#include "BowTable.h"</span>
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<a name="l00007"></a>00007 <span class="preprocessor">#include "OnePole.h"</span>
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<a name="l00008"></a>00008 <span class="preprocessor">#include "BiQuad.h"</span>
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<a name="l00009"></a>00009 <span class="preprocessor">#include "SineWave.h"</span>
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<a name="l00010"></a>00010 <span class="preprocessor">#include "ADSR.h"</span>
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<a name="l00011"></a>00011
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<a name="l00012"></a>00012 <span class="keyword">namespace </span>stk {
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<a name="l00013"></a>00013
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<a name="l00014"></a>00014 <span class="comment">/***************************************************/</span>
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<a name="l00038"></a>00038 <span class="comment">/***************************************************/</span>
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<a name="l00039"></a>00039
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<a name="l00040"></a><a class="code" href="classstk_1_1Bowed.html">00040</a> <span class="keyword">class </span><a class="code" href="classstk_1_1Bowed.html" title="STK bowed string instrument class.">Bowed</a> : <span class="keyword">public</span> <a class="code" href="classstk_1_1Instrmnt.html" title="STK instrument abstract base class.">Instrmnt</a>
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<a name="l00041"></a>00041 {
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<a name="l00042"></a>00042 <span class="keyword">public</span>:
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<a name="l00044"></a>00044 <a class="code" href="classstk_1_1Bowed.html#a1b442f60bbec3d07d2dd322ff761c767" title="Class constructor, taking the lowest desired playing frequency.">Bowed</a>( StkFloat lowestFrequency = 8.0 );
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<a name="l00045"></a>00045
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<a name="l00047"></a>00047 <a class="code" href="classstk_1_1Bowed.html#a8067e4808bf7576922be4698f853c96c" title="Class destructor.">~Bowed</a>( <span class="keywordtype">void</span> );
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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_1Bowed.html#a8d522c36a35b86f90a06cf135fc83b11" title="Reset and clear all internal state.">clear</a>( <span class="keywordtype">void</span> );
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<a name="l00051"></a>00051
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<a name="l00053"></a>00053 <span class="keywordtype">void</span> <a class="code" href="classstk_1_1Bowed.html#a02dbcfbd0766fee8a2e75a8df809e62c" title="Set instrument parameters for a particular frequency.">setFrequency</a>( StkFloat frequency );
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<a name="l00054"></a>00054
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<a name="l00056"></a><a class="code" href="classstk_1_1Bowed.html#a7cf229e206a61259d381cf153a1c5096">00056</a> <span class="keywordtype">void</span> <a class="code" href="classstk_1_1Bowed.html#a7cf229e206a61259d381cf153a1c5096" title="Set vibrato gain.">setVibrato</a>( StkFloat gain ) { vibratoGain_ = gain; };
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<a name="l00057"></a>00057
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<a name="l00059"></a>00059 <span class="keywordtype">void</span> <a class="code" href="classstk_1_1Bowed.html#a519d511ddcc1cf23e897aeacdfe45020" title="Apply breath pressure to instrument with given amplitude and rate of increase.">startBowing</a>( StkFloat amplitude, StkFloat rate );
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<a name="l00060"></a>00060
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<a name="l00062"></a>00062 <span class="keywordtype">void</span> <a class="code" href="classstk_1_1Bowed.html#aae2a57d8e23536fd37a00af1fe07f21c" title="Decrease breath pressure with given rate of decrease.">stopBowing</a>( StkFloat rate );
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<a name="l00063"></a>00063
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<a name="l00065"></a>00065 <span class="keywordtype">void</span> <a class="code" href="classstk_1_1Bowed.html#a4ebaf6bd27d90975e7b0aea0ee727dc1" title="Start a note with the given frequency and amplitude.">noteOn</a>( StkFloat frequency, StkFloat amplitude );
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<a name="l00066"></a>00066
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<a name="l00068"></a>00068 <span class="keywordtype">void</span> <a class="code" href="classstk_1_1Bowed.html#ab86db568328b51e4adfae8b62987fc85" title="Stop a note with the given amplitude (speed of decay).">noteOff</a>( StkFloat amplitude );
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<a name="l00069"></a>00069
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<a name="l00071"></a>00071 <span class="keywordtype">void</span> <a class="code" href="classstk_1_1Bowed.html#ad066af9bb1340b6fcf9002d6922021f4" title="Perform the control change specified by number and value (0.0 - 128.0).">controlChange</a>( <span class="keywordtype">int</span> number, StkFloat value );
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<a name="l00072"></a>00072
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<a name="l00074"></a>00074 StkFloat <a class="code" href="classstk_1_1Bowed.html#a4d583369f0b22335fff8cee3ce6f2750" title="Compute and return one output sample.">tick</a>( <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> channel = 0 );
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<a name="l00075"></a>00075
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<a name="l00077"></a>00077
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<a name="l00084"></a>00084 <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_1Bowed.html#a4d583369f0b22335fff8cee3ce6f2750" 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="l00085"></a>00085
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<a name="l00086"></a>00086 <span class="keyword">protected</span>:
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<a name="l00087"></a>00087
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<a name="l00088"></a>00088 <a class="code" href="classstk_1_1DelayL.html" title="STK linear interpolating delay line class.">DelayL</a> neckDelay_;
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<a name="l00089"></a>00089 <a class="code" href="classstk_1_1DelayL.html" title="STK linear interpolating delay line class.">DelayL</a> bridgeDelay_;
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<a name="l00090"></a>00090 <a class="code" href="classstk_1_1BowTable.html" title="STK bowed string table class.">BowTable</a> bowTable_;
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<a name="l00091"></a>00091 <a class="code" href="classstk_1_1OnePole.html" title="STK one-pole filter class.">OnePole</a> stringFilter_;
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<a name="l00092"></a>00092 <a class="code" href="classstk_1_1BiQuad.html" title="STK biquad (two-pole, two-zero) filter class.">BiQuad</a> bodyFilters_[6];
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<a name="l00093"></a>00093 <a class="code" href="classstk_1_1SineWave.html" title="STK sinusoid oscillator class.">SineWave</a> vibrato_;
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<a name="l00094"></a>00094 <a class="code" href="classstk_1_1ADSR.html" title="STK ADSR envelope class.">ADSR</a> adsr_;
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<a name="l00095"></a>00095
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<a name="l00096"></a>00096 <span class="keywordtype">bool</span> bowDown_;
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<a name="l00097"></a>00097 StkFloat maxVelocity_;
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<a name="l00098"></a>00098 StkFloat baseDelay_;
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<a name="l00099"></a>00099 StkFloat vibratoGain_;
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<a name="l00100"></a>00100 StkFloat betaRatio_;
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<a name="l00101"></a>00101
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<a name="l00102"></a>00102 };
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<a name="l00103"></a>00103
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<a name="l00104"></a><a class="code" href="classstk_1_1Bowed.html#a4d583369f0b22335fff8cee3ce6f2750">00104</a> <span class="keyword">inline</span> StkFloat <a class="code" href="classstk_1_1Bowed.html#a4d583369f0b22335fff8cee3ce6f2750" title="Compute and return one output sample.">Bowed :: tick</a>( <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> )
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<a name="l00105"></a>00105 {
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<a name="l00106"></a>00106 StkFloat bowVelocity = maxVelocity_ * adsr_.<a class="code" href="classstk_1_1ADSR.html#af2c0869f86210a55f4f668172373c975" title="Compute and return one output sample.">tick</a>();
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<a name="l00107"></a>00107 StkFloat bridgeReflection = -stringFilter_.<a class="code" href="classstk_1_1OnePole.html#a3c83b6d43f76bec06f11caa9de76881e" title="Input one sample to the filter and return one output.">tick</a>( bridgeDelay_.<a class="code" href="classstk_1_1DelayL.html#a16810ca38fab79276bb8ec51447623a9" title="Return the last computed output value.">lastOut</a>() );
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<a name="l00108"></a>00108 StkFloat nutReflection = -neckDelay_.<a class="code" href="classstk_1_1DelayL.html#a16810ca38fab79276bb8ec51447623a9" title="Return the last computed output value.">lastOut</a>();
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<a name="l00109"></a>00109 StkFloat stringVelocity = bridgeReflection + nutReflection;
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<a name="l00110"></a>00110 StkFloat deltaV = bowVelocity - stringVelocity; <span class="comment">// Differential velocity</span>
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<a name="l00111"></a>00111
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<a name="l00112"></a>00112 StkFloat newVelocity = 0.0;
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<a name="l00113"></a>00113 <span class="keywordflow">if</span> ( bowDown_ )
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<a name="l00114"></a>00114 newVelocity = deltaV * bowTable_.<a class="code" href="classstk_1_1BowTable.html#a8dc58c69ecda1471dce6d142cb5f4b19" title="Take one sample input and map to one sample of output.">tick</a>( deltaV ); <span class="comment">// Non-Linear bow function</span>
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<a name="l00115"></a>00115 neckDelay_.<a class="code" href="classstk_1_1DelayL.html#a1d01bbaf40cc20a0b70241bb8072da7f" title="Input one sample to the filter and return one output.">tick</a>( bridgeReflection + newVelocity); <span class="comment">// Do string propagations</span>
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<a name="l00116"></a>00116 bridgeDelay_.<a class="code" href="classstk_1_1DelayL.html#a1d01bbaf40cc20a0b70241bb8072da7f" title="Input one sample to the filter and return one output.">tick</a>(nutReflection + newVelocity);
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<a name="l00117"></a>00117
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<a name="l00118"></a>00118 <span class="keywordflow">if</span> ( vibratoGain_ > 0.0 ) {
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<a name="l00119"></a>00119 neckDelay_.<a class="code" href="classstk_1_1DelayL.html#a80dd30628502a7c3b37ff045176eb91f" title="Set the delay-line length.">setDelay</a>( (baseDelay_ * (1.0 - betaRatio_) ) +
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<a name="l00120"></a>00120 (baseDelay_ * vibratoGain_ * vibrato_.<a class="code" href="classstk_1_1SineWave.html#a31a55627bf8064919b5e063059260eda" title="Compute and return one output sample.">tick</a>()) );
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<a name="l00121"></a>00121 }
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<a name="l00122"></a>00122
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<a name="l00123"></a>00123 lastFrame_[0] = 0.1248 * bodyFilters_[5].<a class="code" href="classstk_1_1BiQuad.html#a648086962c3cddcaa09c46a002c3e635" title="Input one sample to the filter and return a reference to one output.">tick</a>( bodyFilters_[4].<a class="code" href="classstk_1_1Bowed.html#a4d583369f0b22335fff8cee3ce6f2750" title="Compute and return one output sample.">tick</a>( bodyFilters_[3].<a class="code" href="classstk_1_1Bowed.html#a4d583369f0b22335fff8cee3ce6f2750" title="Compute and return one output sample.">tick</a>( bodyFilters_[2].<a class="code" href="classstk_1_1Bowed.html#a4d583369f0b22335fff8cee3ce6f2750" title="Compute and return one output sample.">tick</a>( bodyFilters_[1].<a class="code" href="classstk_1_1Bowed.html#a4d583369f0b22335fff8cee3ce6f2750" title="Compute and return one output sample.">tick</a>( bodyFilters_[0].<a class="code" href="classstk_1_1Bowed.html#a4d583369f0b22335fff8cee3ce6f2750" title="Compute and return one output sample.">tick</a>( bridgeDelay_.<a class="code" href="classstk_1_1DelayL.html#a16810ca38fab79276bb8ec51447623a9" title="Return the last computed output value.">lastOut</a>() ) ) ) ) ) );
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<a name="l00124"></a>00124
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<a name="l00125"></a>00125 <span class="keywordflow">return</span> lastFrame_[0];
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<a name="l00126"></a>00126 }
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<a name="l00127"></a>00127
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<a name="l00128"></a><a class="code" href="classstk_1_1Bowed.html#ab7985e95058016201d16f3717039e1cd">00128</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_1Bowed.html#a4d583369f0b22335fff8cee3ce6f2750" title="Compute and return one output sample.">Bowed :: 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="l00129"></a>00129 {
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<a name="l00130"></a>00130 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> nChannels = lastFrame_.<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="preprocessor">#if defined(_STK_DEBUG_)</span>
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<a name="l00132"></a>00132 <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>() - nChannels ) {
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<a name="l00133"></a>00133 oStream_ << <span class="stringliteral">"Bowed::tick(): channel and StkFrames arguments are incompatible!"</span>;
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<a name="l00134"></a>00134 <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="l00135"></a>00135 }
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<a name="l00136"></a>00136 <span class="preprocessor">#endif</span>
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<a name="l00137"></a>00137 <span class="preprocessor"></span>
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<a name="l00138"></a>00138 StkFloat *samples = &frames[channel];
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<a name="l00139"></a>00139 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> j, hop = frames.<a class="code" href="classstk_1_1StkFrames.html#aec7ef9c46675a24111aa6e2fda3ba870" title="Return the number of channels represented by the data.">channels</a>() - nChannels;
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<a name="l00140"></a>00140 <span class="keywordflow">if</span> ( nChannels == 1 ) {
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<a name="l00141"></a>00141 <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="l00142"></a>00142 *samples++ = <a class="code" href="classstk_1_1Bowed.html#a4d583369f0b22335fff8cee3ce6f2750" title="Compute and return one output sample.">tick</a>();
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<a name="l00143"></a>00143 }
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<a name="l00144"></a>00144 <span class="keywordflow">else</span> {
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<a name="l00145"></a>00145 <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="l00146"></a>00146 *samples++ = <a class="code" href="classstk_1_1Bowed.html#a4d583369f0b22335fff8cee3ce6f2750" title="Compute and return one output sample.">tick</a>();
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<a name="l00147"></a>00147 <span class="keywordflow">for</span> ( j=1; j<nChannels; j++ )
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<a name="l00148"></a>00148 *samples++ = lastFrame_[j];
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<a name="l00149"></a>00149 }
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<a name="l00150"></a>00150 }
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<a name="l00151"></a>00151
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<a name="l00152"></a>00152 <span class="keywordflow">return</span> frames;
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<a name="l00153"></a>00153 }
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<a name="l00154"></a>00154
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<a name="l00155"></a>00155 } <span class="comment">// stk namespace</span>
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<a name="l00156"></a>00156
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<a name="l00157"></a>00157 <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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</table>
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