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<HTML>
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<TITLE>The Synthesis ToolKit in C++ (STK)</TITLE>
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<img src="princeton.gif"> <img src="ccrma.gif"> <img src="mcgill.gif"><P>
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<a class="qindex" href="index.html">Home</a> <a class="qindex" href="information.html">Information</a> <a class="qindex" href="classes.html">Classes</a> <a class="qindex" href="download.html">Download</a> <a class="qindex" href="usage.html">Usage</a> <a class="qindex" href="maillist.html">Mail List</a> <a class="qindex" href="system.html">Requirements</a> <a class="qindex" href="links.html">Links</a> <a class="qindex" href="faq.html">FAQ</a> <a class="qindex" href="tutorial.html">Tutorial</a></CENTER>
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<!-- Generated by Doxygen 1.6.2 -->
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<div class="navpath"><a class="el" href="namespacestk.html">stk</a>::<a class="el" href="classstk_1_1Chorus.html">Chorus</a>
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</div>
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<div class="contents">
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<h1>stk::Chorus Class Reference</h1><!-- doxytag: class="stk::Chorus" --><!-- doxytag: inherits="stk::Effect" -->
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<p>STK chorus effect class.
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<a href="#_details">More...</a></p>
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<p><code>#include <<a class="el" href="Chorus_8h_source.html">Chorus.h</a>></code></p>
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<div class="dynheader">
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Inheritance diagram for stk::Chorus:</div>
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<div class="dynsection">
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<div class="center">
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<img src="classstk_1_1Chorus.png" usemap="#stk::Chorus_map" alt=""/>
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<map id="stk::Chorus_map" name="stk::Chorus_map">
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<area href="classstk_1_1Effect.html" alt="stk::Effect" shape="rect" coords="0,56,74,80"/>
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<area href="classstk_1_1Stk.html" alt="stk::Stk" shape="rect" coords="0,0,74,24"/>
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</map>
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</div>
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</div>
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<p><a href="classstk_1_1Chorus-members.html">List of all members.</a></p>
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<table border="0" cellpadding="0" cellspacing="0">
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<tr><td colspan="2"><h2>Public Member Functions</h2></td></tr>
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<tr><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1Chorus.html#a529f668e66188ae5a42e4cc30779059f">Chorus</a> (StkFloat baseDelay=6000)</td></tr>
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<tr><td class="mdescLeft"> </td><td class="mdescRight">Class constructor, taking the median desired delay length. <a href="#a529f668e66188ae5a42e4cc30779059f"></a><br/></td></tr>
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<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a63acbdd04d13110712c36a5cac5d972d"></a><!-- doxytag: member="stk::Chorus::clear" ref="a63acbdd04d13110712c36a5cac5d972d" args="(void)" -->
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void </td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1Chorus.html#a63acbdd04d13110712c36a5cac5d972d">clear</a> (void)</td></tr>
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<tr><td class="mdescLeft"> </td><td class="mdescRight">Reset and clear all internal state. <br/></td></tr>
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<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="acb3a55518c919dafa6c19698c1ab3389"></a><!-- doxytag: member="stk::Chorus::setModDepth" ref="acb3a55518c919dafa6c19698c1ab3389" args="(StkFloat depth)" -->
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void </td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1Chorus.html#acb3a55518c919dafa6c19698c1ab3389">setModDepth</a> (StkFloat depth)</td></tr>
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<tr><td class="mdescLeft"> </td><td class="mdescRight">Set modulation depth in range 0.0 - 1.0. <br/></td></tr>
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<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="aa4372095b8526d62ff9cfbdb03f21c4d"></a><!-- doxytag: member="stk::Chorus::setModFrequency" ref="aa4372095b8526d62ff9cfbdb03f21c4d" args="(StkFloat frequency)" -->
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void </td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1Chorus.html#aa4372095b8526d62ff9cfbdb03f21c4d">setModFrequency</a> (StkFloat frequency)</td></tr>
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<tr><td class="mdescLeft"> </td><td class="mdescRight">Set modulation frequency. <br/></td></tr>
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<tr><td class="memItemLeft" align="right" valign="top">StkFloat </td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1Chorus.html#aabcc110787ec3b443c21845b2f06bb3c">lastOut</a> (unsigned int channel=0)</td></tr>
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<tr><td class="mdescLeft"> </td><td class="mdescRight">Return the specified channel value of the last computed stereo frame. <a href="#aabcc110787ec3b443c21845b2f06bb3c"></a><br/></td></tr>
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<tr><td class="memItemLeft" align="right" valign="top">StkFloat </td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1Chorus.html#a31d5c48d5b4a030040f6bb6b5e2c99cf">tick</a> (StkFloat input, unsigned int channel=0)</td></tr>
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<tr><td class="mdescLeft"> </td><td class="mdescRight">Input one sample to the effect and return the specified <code>channel</code> value of the computed stereo frame. <a href="#a31d5c48d5b4a030040f6bb6b5e2c99cf"></a><br/></td></tr>
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<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="classstk_1_1StkFrames.html">StkFrames</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1Chorus.html#aef55c6fb93a1d00498ae436868f84501">tick</a> (<a class="el" href="classstk_1_1StkFrames.html">StkFrames</a> &frames, unsigned int channel=0)</td></tr>
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<tr><td class="mdescLeft"> </td><td class="mdescRight">Take a channel of the <a class="el" href="classstk_1_1StkFrames.html" title="An STK class to handle vectorized audio data.">StkFrames</a> object as inputs to the effect and replace with stereo outputs. <a href="#aef55c6fb93a1d00498ae436868f84501"></a><br/></td></tr>
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<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="classstk_1_1StkFrames.html">StkFrames</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1Chorus.html#abdb8802a83f6b89716316399138e3032">tick</a> (<a class="el" href="classstk_1_1StkFrames.html">StkFrames</a> &iFrames, <a class="el" href="classstk_1_1StkFrames.html">StkFrames</a> &oFrames, unsigned int iChannel=0, unsigned int oChannel=0)</td></tr>
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<tr><td class="mdescLeft"> </td><td class="mdescRight">Take a channel of the <code>iFrames</code> object as inputs to the effect and write stereo outputs to the <code>oFrames</code> object. <a href="#abdb8802a83f6b89716316399138e3032"></a><br/></td></tr>
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</table>
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<hr/><a name="_details"></a><h2>Detailed Description</h2>
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<p>STK chorus effect class. </p>
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<p>This class implements a chorus effect. It takes a monophonic input signal and produces a stereo output signal.</p>
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<p>by Perry R. Cook and Gary P. Scavone, 1995-2011. </p>
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<hr/><h2>Constructor & Destructor Documentation</h2>
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<a class="anchor" id="a529f668e66188ae5a42e4cc30779059f"></a><!-- doxytag: member="stk::Chorus::Chorus" ref="a529f668e66188ae5a42e4cc30779059f" args="(StkFloat baseDelay=6000)" -->
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<td class="memname">stk::Chorus::Chorus </td>
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<td>(</td>
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<td class="paramtype">StkFloat </td>
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<td class="paramname"> <em>baseDelay</em> = <code>6000</code></td>
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<td> ) </td>
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<td></td>
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<div class="memdoc">
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<p>Class constructor, taking the median desired delay length. </p>
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<p>An <a class="el" href="classstk_1_1StkError.html" title="STK error handling class.">StkError</a> can be thrown if the rawwave path is incorrect. </p>
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</div>
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</div>
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<hr/><h2>Member Function Documentation</h2>
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<a class="anchor" id="aabcc110787ec3b443c21845b2f06bb3c"></a><!-- doxytag: member="stk::Chorus::lastOut" ref="aabcc110787ec3b443c21845b2f06bb3c" args="(unsigned int channel=0)" -->
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<td class="memname">StkFloat stk::Chorus::lastOut </td>
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<td>(</td>
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<td class="paramtype">unsigned int </td>
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<td class="paramname"> <em>channel</em> = <code>0</code></td>
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<td> ) </td>
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<td><code> [inline]</code></td>
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</tr>
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</table>
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<div class="memdoc">
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<p>Return the specified channel value of the last computed stereo frame. </p>
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<p>Use the <a class="el" href="classstk_1_1Effect.html#a3d7e2b8942bf7adcc71dfc6dccbb7aa0" title="Return an StkFrames reference to the last output sample frame.">lastFrame()</a> function to get both values of the last computed stereo frame. The <code>channel</code> argument must be 0 or 1 (the first channel is specified by 0). However, range checking is only performed if _STK_DEBUG_ is defined during compilation, in which case an out-of-range value will trigger an <a class="el" href="classstk_1_1StkError.html" title="STK error handling class.">StkError</a> exception. </p>
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<p><div class="fragment"><pre class="fragment"><a name="l00094"></a>00094 {
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<a name="l00095"></a>00095 <span class="preprocessor">#if defined(_STK_DEBUG_)</span>
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<a name="l00096"></a>00096 <span class="preprocessor"></span> <span class="keywordflow">if</span> ( channel > 1 ) {
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<a name="l00097"></a>00097 oStream_ << <span class="stringliteral">"Chorus::lastOut(): channel argument must be less than 2!"</span>;
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<a name="l00098"></a>00098 <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="l00099"></a>00099 }
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<a name="l00100"></a>00100 <span class="preprocessor">#endif</span>
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<a name="l00101"></a>00101 <span class="preprocessor"></span>
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<a name="l00102"></a>00102 <span class="keywordflow">return</span> lastFrame_[channel];
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<a name="l00103"></a>00103 }
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</pre></div></p>
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</div>
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</div>
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<a class="anchor" id="a31d5c48d5b4a030040f6bb6b5e2c99cf"></a><!-- doxytag: member="stk::Chorus::tick" ref="a31d5c48d5b4a030040f6bb6b5e2c99cf" args="(StkFloat input, unsigned int channel=0)" -->
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<td class="memname">StkFloat stk::Chorus::tick </td>
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<td>(</td>
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<td class="paramtype">StkFloat </td>
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<td class="paramname"> <em>input</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">unsigned int </td>
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<td class="paramname"> <em>channel</em> = <code>0</code></td><td> </td>
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</tr>
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<tr>
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<td></td>
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<td>)</td>
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<td></td><td></td><td><code> [inline]</code></td>
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</tr>
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<div class="memdoc">
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<p>Input one sample to the effect and return the specified <code>channel</code> value of the computed stereo frame. </p>
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<p>Use the <a class="el" href="classstk_1_1Effect.html#a3d7e2b8942bf7adcc71dfc6dccbb7aa0" title="Return an StkFrames reference to the last output sample frame.">lastFrame()</a> function to get both values of the computed stereo output frame. The <code>channel</code> argument must be 0 or 1 (the first channel is specified by 0). However, range checking is only performed if _STK_DEBUG_ is defined during compilation, in which case an out-of-range value will trigger an <a class="el" href="classstk_1_1StkError.html" title="STK error handling class.">StkError</a> exception. </p>
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<p><div class="fragment"><pre class="fragment"><a name="l00106"></a>00106 {
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<a name="l00107"></a>00107 <span class="preprocessor">#if defined(_STK_DEBUG_)</span>
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<a name="l00108"></a>00108 <span class="preprocessor"></span> <span class="keywordflow">if</span> ( channel > 1 ) {
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<a name="l00109"></a>00109 oStream_ << <span class="stringliteral">"Chorus::tick(): channel argument must be less than 2!"</span>;
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<a name="l00110"></a>00110 <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="l00111"></a>00111 }
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<a name="l00112"></a>00112 <span class="preprocessor">#endif</span>
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<a name="l00113"></a>00113 <span class="preprocessor"></span>
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<a name="l00114"></a>00114 delayLine_[0].setDelay( baseLength_ * 0.707 * ( 1.0 + modDepth_ * mods_[0].<a class="code" href="classstk_1_1Chorus.html#a31d5c48d5b4a030040f6bb6b5e2c99cf" title="Input one sample to the effect and return the specified channel value of the computed...">tick</a>() ) );
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<a name="l00115"></a>00115 delayLine_[1].setDelay( baseLength_ * 0.5 * ( 1.0 - modDepth_ * mods_[1].<a class="code" href="classstk_1_1Chorus.html#a31d5c48d5b4a030040f6bb6b5e2c99cf" title="Input one sample to the effect and return the specified channel value of the computed...">tick</a>() ) );
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<a name="l00116"></a>00116 lastFrame_[0] = effectMix_ * ( delayLine_[0].tick( input ) - input ) + input;
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<a name="l00117"></a>00117 lastFrame_[1] = effectMix_ * ( delayLine_[1].tick( input ) - input ) + input;
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<a name="l00118"></a>00118 <span class="keywordflow">return</span> lastFrame_[channel];
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<a name="l00119"></a>00119 }
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</pre></div></p>
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<a class="anchor" id="aef55c6fb93a1d00498ae436868f84501"></a><!-- doxytag: member="stk::Chorus::tick" ref="aef55c6fb93a1d00498ae436868f84501" args="(StkFrames &frames, unsigned int channel=0)" -->
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<td class="memname"><a class="el" href="classstk_1_1StkFrames.html">StkFrames</a> & stk::Chorus::tick </td>
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<td>(</td>
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<td class="paramtype"><a class="el" href="classstk_1_1StkFrames.html">StkFrames</a> & </td>
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<td class="paramname"> <em>frames</em>, </td>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">unsigned int </td>
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<td class="paramname"> <em>channel</em> = <code>0</code></td><td> </td>
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<tr>
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<td></td>
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<td>)</td>
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<td></td><td></td><td><code> [inline]</code></td>
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<p>Take a channel of the <a class="el" href="classstk_1_1StkFrames.html" title="An STK class to handle vectorized audio data.">StkFrames</a> object as inputs to the effect and replace with stereo outputs. </p>
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<p>The <a class="el" href="classstk_1_1StkFrames.html" title="An STK class to handle vectorized audio data.">StkFrames</a> argument reference is returned. The stereo outputs are written to the <a class="el" href="classstk_1_1StkFrames.html" title="An STK class to handle vectorized audio data.">StkFrames</a> argument starting at the specified <code>channel</code>. Therefore, the <code>channel</code> argument must be less than ( channels() - 1 ) of the <a class="el" href="classstk_1_1StkFrames.html" title="An STK class to handle vectorized audio data.">StkFrames</a> argument (the first channel is specified by 0). However, range checking is only performed if _STK_DEBUG_ is defined during compilation, in which case an out-of-range value will trigger an <a class="el" href="classstk_1_1StkError.html" title="STK error handling class.">StkError</a> exception. </p>
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<p><div class="fragment"><pre class="fragment"><a name="l00122"></a>00122 {
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<a name="l00123"></a>00123 <span class="preprocessor">#if defined(_STK_DEBUG_)</span>
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<a name="l00124"></a>00124 <span class="preprocessor"></span> <span class="keywordflow">if</span> ( channel >= frames.channels() - 1 ) {
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<a name="l00125"></a>00125 oStream_ << <span class="stringliteral">"Chorus::tick(): channel and StkFrames arguments are incompatible!"</span>;
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<a name="l00126"></a>00126 <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="l00127"></a>00127 }
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<a name="l00128"></a>00128 <span class="preprocessor">#endif</span>
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<a name="l00129"></a>00129 <span class="preprocessor"></span>
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<a name="l00130"></a>00130 StkFloat *samples = &frames[channel];
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<a name="l00131"></a>00131 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> hop = frames.channels() - 1;
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<a name="l00132"></a>00132 <span class="keywordflow">for</span> ( <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i=0; i<frames.frames(); i++, samples += hop ) {
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<a name="l00133"></a>00133 delayLine_[0].setDelay( baseLength_ * 0.707 * ( 1.0 + modDepth_ * mods_[0].<a class="code" href="classstk_1_1Chorus.html#a31d5c48d5b4a030040f6bb6b5e2c99cf" title="Input one sample to the effect and return the specified channel value of the computed...">tick</a>() ) );
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<a name="l00134"></a>00134 delayLine_[1].setDelay( baseLength_ * 0.5 * ( 1.0 - modDepth_ * mods_[1].<a class="code" href="classstk_1_1Chorus.html#a31d5c48d5b4a030040f6bb6b5e2c99cf" title="Input one sample to the effect and return the specified channel value of the computed...">tick</a>() ) );
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<a name="l00135"></a>00135 *samples = effectMix_ * ( delayLine_[0].tick( *samples ) - *samples ) + *samples;
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<a name="l00136"></a>00136 samples++;
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<a name="l00137"></a>00137 *samples = effectMix_ * ( delayLine_[1].tick( *samples ) - *samples ) + *samples;
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<a name="l00138"></a>00138 }
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<a name="l00139"></a>00139
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<a name="l00140"></a>00140 lastFrame_[0] = *(samples-hop);
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<a name="l00141"></a>00141 lastFrame_[1] = *(samples-hop+1);
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<a name="l00142"></a>00142 <span class="keywordflow">return</span> frames;
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<a name="l00143"></a>00143 }
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</pre></div></p>
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</div>
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<a class="anchor" id="abdb8802a83f6b89716316399138e3032"></a><!-- doxytag: member="stk::Chorus::tick" ref="abdb8802a83f6b89716316399138e3032" args="(StkFrames &iFrames, StkFrames &oFrames, unsigned int iChannel=0, unsigned int oChannel=0)" -->
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<td class="memname"><a class="el" href="classstk_1_1StkFrames.html">StkFrames</a> & stk::Chorus::tick </td>
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<td>(</td>
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<td class="paramtype"><a class="el" href="classstk_1_1StkFrames.html">StkFrames</a> & </td>
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<td class="paramtype"><a class="el" href="classstk_1_1StkFrames.html">StkFrames</a> & </td>
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<td class="paramname"> <em>oFrames</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">unsigned int </td>
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<td class="paramname"> <em>iChannel</em> = <code>0</code>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">unsigned int </td>
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<td class="paramname"> <em>oChannel</em> = <code>0</code></td><td> </td>
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</tr>
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<tr>
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<td></td>
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<td>)</td>
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<td></td><td></td><td><code> [inline]</code></td>
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</tr>
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</div>
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<div class="memdoc">
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<p>Take a channel of the <code>iFrames</code> object as inputs to the effect and write stereo outputs to the <code>oFrames</code> object. </p>
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<p>The <code>iFrames</code> object reference is returned. The <code>iChannel</code> argument must be less than the number of channels in the <code>iFrames</code> argument (the first channel is specified by 0). The <code>oChannel</code> argument must be less than ( channels() - 1 ) of the <code>oFrames</code> argument. However, range checking is only performed if _STK_DEBUG_ is defined during compilation, in which case an out-of-range value will trigger an <a class="el" href="classstk_1_1StkError.html" title="STK error handling class.">StkError</a> exception. </p>
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<p><div class="fragment"><pre class="fragment"><a name="l00146"></a>00146 {
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<a name="l00147"></a>00147 <span class="preprocessor">#if defined(_STK_DEBUG_)</span>
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<a name="l00148"></a>00148 <span class="preprocessor"></span> <span class="keywordflow">if</span> ( iChannel >= iFrames.channels() || oChannel >= oFrames.channels() - 1 ) {
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<a name="l00149"></a>00149 oStream_ << <span class="stringliteral">"Chorus::tick(): channel and StkFrames arguments are incompatible!"</span>;
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<a name="l00150"></a>00150 <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="l00151"></a>00151 }
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<a name="l00152"></a>00152 <span class="preprocessor">#endif</span>
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<a name="l00153"></a>00153 <span class="preprocessor"></span>
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<a name="l00154"></a>00154 StkFloat *iSamples = &iFrames[iChannel];
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<a name="l00155"></a>00155 StkFloat *oSamples = &oFrames[oChannel];
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<a name="l00156"></a>00156 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> iHop = iFrames.channels(), oHop = oFrames.channels();
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<a name="l00157"></a>00157 <span class="keywordflow">for</span> ( <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i=0; i<iFrames.frames(); i++, iSamples += iHop, oSamples += oHop ) {
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<a name="l00158"></a>00158 delayLine_[0].setDelay( baseLength_ * 0.707 * ( 1.0 + modDepth_ * mods_[0].<a class="code" href="classstk_1_1Chorus.html#a31d5c48d5b4a030040f6bb6b5e2c99cf" title="Input one sample to the effect and return the specified channel value of the computed...">tick</a>() ) );
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<a name="l00159"></a>00159 delayLine_[1].setDelay( baseLength_ * 0.5 * ( 1.0 - modDepth_ * mods_[1].<a class="code" href="classstk_1_1Chorus.html#a31d5c48d5b4a030040f6bb6b5e2c99cf" title="Input one sample to the effect and return the specified channel value of the computed...">tick</a>() ) );
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<a name="l00160"></a>00160 *oSamples = effectMix_ * ( delayLine_[0].tick( *iSamples ) - *iSamples ) + *iSamples;
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<a name="l00161"></a>00161 *(oSamples+1) = effectMix_ * ( delayLine_[1].<a class="code" href="classstk_1_1Chorus.html#a31d5c48d5b4a030040f6bb6b5e2c99cf" title="Input one sample to the effect and return the specified channel value of the computed...">tick</a>( *iSamples ) - *iSamples ) + *iSamples;
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<a name="l00162"></a>00162 }
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<a name="l00163"></a>00163
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<a name="l00164"></a>00164 lastFrame_[0] = *(oSamples-oHop);
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<a name="l00165"></a>00165 lastFrame_[1] = *(oSamples-oHop+1);
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<a name="l00166"></a>00166 <span class="keywordflow">return</span> iFrames;
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<a name="l00167"></a>00167 }
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</pre></div></p>
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</div>
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</div>
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<hr/>The documentation for this class was generated from the following file:<ul>
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<li><a class="el" href="Chorus_8h_source.html">Chorus.h</a></li>
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</ul>
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</div>
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<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>©1995-2011 Perry R. Cook and Gary P. Scavone. All Rights Reserved.</td></tr>
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</table>
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