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<TITLE>The Synthesis ToolKit in C++ (STK)</TITLE>
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<h1>BlowHole.h</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="preprocessor">#ifndef STK_BLOWHOLE_H</span>
<a name="l00002"></a>00002 <span class="preprocessor"></span><span class="preprocessor">#define STK_BLOWHOLE_H</span>
<a name="l00003"></a>00003 <span class="preprocessor"></span>
<a name="l00004"></a>00004 <span class="preprocessor">#include "Instrmnt.h"</span>
<a name="l00005"></a>00005 <span class="preprocessor">#include "DelayL.h"</span>
<a name="l00006"></a>00006 <span class="preprocessor">#include "ReedTable.h"</span>
<a name="l00007"></a>00007 <span class="preprocessor">#include "OneZero.h"</span>
<a name="l00008"></a>00008 <span class="preprocessor">#include "PoleZero.h"</span>
<a name="l00009"></a>00009 <span class="preprocessor">#include "Envelope.h"</span>
<a name="l00010"></a>00010 <span class="preprocessor">#include "Noise.h"</span>
<a name="l00011"></a>00011 <span class="preprocessor">#include "SineWave.h"</span>
<a name="l00012"></a>00012
<a name="l00013"></a>00013 <span class="keyword">namespace </span>stk {
<a name="l00014"></a>00014
<a name="l00015"></a>00015 <span class="comment">/***************************************************/</span>
<a name="l00048"></a>00048 <span class="comment">/***************************************************/</span>
<a name="l00049"></a>00049
<a name="l00050"></a><a class="code" href="classstk_1_1BlowHole.html">00050</a> <span class="keyword">class </span><a class="code" href="classstk_1_1BlowHole.html" title="STK clarinet physical model with one register hole and one tonehole.">BlowHole</a> : <span class="keyword">public</span> <a class="code" href="classstk_1_1Instrmnt.html" title="STK instrument abstract base class.">Instrmnt</a>
<a name="l00051"></a>00051 {
<a name="l00052"></a>00052 <span class="keyword">public</span>:
<a name="l00054"></a>00054
<a name="l00057"></a>00057 <a class="code" href="classstk_1_1BlowHole.html#7f0aed9f79544d930c7f91dfa3e0efd9" title="Class constructor.">BlowHole</a>( StkFloat lowestFrequency );
<a name="l00058"></a>00058
<a name="l00060"></a>00060 <a class="code" href="classstk_1_1BlowHole.html#691a14023e9283d12b0105dd886fba86" title="Class destructor.">~BlowHole</a>( <span class="keywordtype">void</span> );
<a name="l00061"></a>00061
<a name="l00063"></a>00063 <span class="keywordtype">void</span> <a class="code" href="classstk_1_1BlowHole.html#43b829201197f2d0f0e8a72072e6798a" title="Reset and clear all internal state.">clear</a>( <span class="keywordtype">void</span> );
<a name="l00064"></a>00064
<a name="l00066"></a>00066 <span class="keywordtype">void</span> <a class="code" href="classstk_1_1BlowHole.html#023aa77cd11c9dc3a8013242ff92f982" title="Set instrument parameters for a particular frequency.">setFrequency</a>( StkFloat frequency );
<a name="l00067"></a>00067
<a name="l00069"></a>00069 <span class="keywordtype">void</span> <a class="code" href="classstk_1_1BlowHole.html#aacb152624133d82e311b9e0b8218289" title="Set the tonehole state (0.0 = closed, 1.0 = fully open).">setTonehole</a>( StkFloat newValue );
<a name="l00070"></a>00070
<a name="l00072"></a>00072 <span class="keywordtype">void</span> <a class="code" href="classstk_1_1BlowHole.html#11c8a4a8483acf0f3e73c1d00008daff" title="Set the register hole state (0.0 = closed, 1.0 = fully open).">setVent</a>( StkFloat newValue );
<a name="l00073"></a>00073
<a name="l00075"></a>00075 <span class="keywordtype">void</span> <a class="code" href="classstk_1_1BlowHole.html#1be64a601f2fbc8e9efaec5a53c55866" title="Apply breath pressure to instrument with given amplitude and rate of increase.">startBlowing</a>( StkFloat amplitude, StkFloat rate );
<a name="l00076"></a>00076
<a name="l00078"></a>00078 <span class="keywordtype">void</span> <a class="code" href="classstk_1_1BlowHole.html#eb4dfd7d75b1996e15833c0928ed39c4" title="Decrease breath pressure with given rate of decrease.">stopBlowing</a>( StkFloat rate );
<a name="l00079"></a>00079
<a name="l00081"></a>00081 <span class="keywordtype">void</span> <a class="code" href="classstk_1_1BlowHole.html#67e071cb26c1bba35e32f168d59b9be1" title="Start a note with the given frequency and amplitude.">noteOn</a>( StkFloat frequency, StkFloat amplitude );
<a name="l00082"></a>00082
<a name="l00084"></a>00084 <span class="keywordtype">void</span> <a class="code" href="classstk_1_1BlowHole.html#bc3743ac2c8a9620c44cca41ce73e5b0" title="Stop a note with the given amplitude (speed of decay).">noteOff</a>( StkFloat amplitude );
<a name="l00085"></a>00085
<a name="l00087"></a>00087 <span class="keywordtype">void</span> <a class="code" href="classstk_1_1BlowHole.html#0d8ad0201c455894acb1416ffb21614b" title="Perform the control change specified by number and value (0.0 - 128.0).">controlChange</a>( <span class="keywordtype">int</span> number, StkFloat value );
<a name="l00088"></a>00088
<a name="l00090"></a>00090 StkFloat <a class="code" href="classstk_1_1BlowHole.html#3438c72b975481dae7d51f33f6f6fd94" title="Compute and return one output sample.">tick</a>( <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> channel = 0 );
<a name="l00091"></a>00091
<a name="l00092"></a>00092 <span class="keyword">protected</span>:
<a name="l00093"></a>00093
<a name="l00094"></a>00094 <a class="code" href="classstk_1_1DelayL.html" title="STK linear interpolating delay line class.">DelayL</a> delays_[3];
<a name="l00095"></a>00095 <a class="code" href="classstk_1_1ReedTable.html" title="STK reed table class.">ReedTable</a> reedTable_;
<a name="l00096"></a>00096 <a class="code" href="classstk_1_1OneZero.html" title="STK one-zero filter class.">OneZero</a> filter_;
<a name="l00097"></a>00097 <a class="code" href="classstk_1_1PoleZero.html" title="STK one-pole, one-zero filter class.">PoleZero</a> tonehole_;
<a name="l00098"></a>00098 <a class="code" href="classstk_1_1PoleZero.html" title="STK one-pole, one-zero filter class.">PoleZero</a> vent_;
<a name="l00099"></a>00099 <a class="code" href="classstk_1_1Envelope.html" title="STK linear line envelope class.">Envelope</a> envelope_;
<a name="l00100"></a>00100 <a class="code" href="classstk_1_1Noise.html" title="STK noise generator.">Noise</a> noise_;
<a name="l00101"></a>00101 <a class="code" href="classstk_1_1SineWave.html" title="STK sinusoid oscillator class.">SineWave</a> vibrato_;
<a name="l00102"></a>00102 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> length_;
<a name="l00103"></a>00103 StkFloat scatter_;
<a name="l00104"></a>00104 StkFloat thCoeff_;
<a name="l00105"></a>00105 StkFloat rhGain_;
<a name="l00106"></a>00106 StkFloat outputGain_;
<a name="l00107"></a>00107 StkFloat noiseGain_;
<a name="l00108"></a>00108 StkFloat vibratoGain_;
<a name="l00109"></a>00109
<a name="l00110"></a>00110 };
<a name="l00111"></a>00111
<a name="l00112"></a><a class="code" href="classstk_1_1BlowHole.html#3438c72b975481dae7d51f33f6f6fd94">00112</a> <span class="keyword">inline</span> StkFloat <a class="code" href="classstk_1_1BlowHole.html#3438c72b975481dae7d51f33f6f6fd94" title="Compute and return one output sample.">BlowHole :: tick</a>( <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> )
<a name="l00113"></a>00113 {
<a name="l00114"></a>00114 StkFloat pressureDiff;
<a name="l00115"></a>00115 StkFloat breathPressure;
<a name="l00116"></a>00116 StkFloat temp;
<a name="l00117"></a>00117
<a name="l00118"></a>00118 <span class="comment">// Calculate the breath pressure (envelope + noise + vibrato)</span>
<a name="l00119"></a>00119 breathPressure = envelope_.<a class="code" href="classstk_1_1Envelope.html#8de91b9caf10a03f52bd2247648c4601" title="Compute and return one output sample.">tick</a>();
<a name="l00120"></a>00120 breathPressure += breathPressure * noiseGain_ * noise_.<a class="code" href="classstk_1_1Noise.html#8ac40f69475eb744e803d557e8438a6d" title="Compute and return one output sample.">tick</a>();
<a name="l00121"></a>00121 breathPressure += breathPressure * vibratoGain_ * vibrato_.<a class="code" href="classstk_1_1SineWave.html#31a55627bf8064919b5e063059260eda" title="Compute and return one output sample.">tick</a>();
<a name="l00122"></a>00122
<a name="l00123"></a>00123 <span class="comment">// Calculate the differential pressure = reflected - mouthpiece pressures</span>
<a name="l00124"></a>00124 pressureDiff = delays_[0].<a class="code" href="classstk_1_1DelayL.html#16810ca38fab79276bb8ec51447623a9" title="Return the last computed output value.">lastOut</a>() - breathPressure;
<a name="l00125"></a>00125
<a name="l00126"></a>00126 <span class="comment">// Do two-port junction scattering for register vent</span>
<a name="l00127"></a>00127 StkFloat pa = breathPressure + pressureDiff * reedTable_.<a class="code" href="classstk_1_1ReedTable.html#3c1607ed5712e2ab010d8c5e55e431f2" title="Take one sample input and map to one sample of output.">tick</a>( pressureDiff );
<a name="l00128"></a>00128 StkFloat pb = delays_[1].<a class="code" href="classstk_1_1DelayL.html#16810ca38fab79276bb8ec51447623a9" title="Return the last computed output value.">lastOut</a>();
<a name="l00129"></a>00129 vent_.<a class="code" href="classstk_1_1PoleZero.html#1a29ac6f3a2b75e71693c73554599228" title="Input one sample to the filter and return one output.">tick</a>( pa+pb );
<a name="l00130"></a>00130
<a name="l00131"></a>00131 lastFrame_[0] = delays_[0].<a class="code" href="classstk_1_1DelayL.html#1d01bbaf40cc20a0b70241bb8072da7f" title="Input one sample to the filter and return one output.">tick</a>( vent_.<a class="code" href="classstk_1_1PoleZero.html#03edf036d1619bb5d33bb41701833232" title="Return the last computed output value.">lastOut</a>()+pb );
<a name="l00132"></a>00132 lastFrame_[0] *= outputGain_;
<a name="l00133"></a>00133
<a name="l00134"></a>00134 <span class="comment">// Do three-port junction scattering (under tonehole)</span>
<a name="l00135"></a>00135 pa += vent_.<a class="code" href="classstk_1_1PoleZero.html#03edf036d1619bb5d33bb41701833232" title="Return the last computed output value.">lastOut</a>();
<a name="l00136"></a>00136 pb = delays_[2].<a class="code" href="classstk_1_1DelayL.html#16810ca38fab79276bb8ec51447623a9" title="Return the last computed output value.">lastOut</a>();
<a name="l00137"></a>00137 StkFloat pth = tonehole_.<a class="code" href="classstk_1_1PoleZero.html#03edf036d1619bb5d33bb41701833232" title="Return the last computed output value.">lastOut</a>();
<a name="l00138"></a>00138 temp = scatter_ * (pa + pb - 2 * pth);
<a name="l00139"></a>00139
<a name="l00140"></a>00140 delays_[2].<a class="code" href="classstk_1_1DelayL.html#1d01bbaf40cc20a0b70241bb8072da7f" title="Input one sample to the filter and return one output.">tick</a>( filter_.<a class="code" href="classstk_1_1OneZero.html#9f52fa395257b15cb7351c6ccb2199da" title="Input one sample to the filter and return one output.">tick</a>(pa + temp) * -0.95 );
<a name="l00141"></a>00141 delays_[1].<a class="code" href="classstk_1_1DelayL.html#1d01bbaf40cc20a0b70241bb8072da7f" title="Input one sample to the filter and return one output.">tick</a>( pb + temp );
<a name="l00142"></a>00142 tonehole_.<a class="code" href="classstk_1_1PoleZero.html#1a29ac6f3a2b75e71693c73554599228" title="Input one sample to the filter and return one output.">tick</a>( pa + pb - pth + temp );
<a name="l00143"></a>00143
<a name="l00144"></a>00144 <span class="keywordflow">return</span> lastFrame_[0];
<a name="l00145"></a>00145 }
<a name="l00146"></a>00146
<a name="l00147"></a>00147 } <span class="comment">// stk namespace</span>
<a name="l00148"></a>00148
<a name="l00149"></a>00149 <span class="preprocessor">#endif</span>
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