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<HTML>
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<TITLE>The Synthesis ToolKit in C++ (STK)</TITLE>
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<!-- Generated by Doxygen 1.6.2 -->
  <div class="navpath"><a class="el" href="namespacestk.html">stk</a>::<a class="el" href="classstk_1_1BowTable.html">BowTable</a>
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<div class="contents">
<h1>stk::BowTable Class Reference</h1><!-- doxytag: class="stk::BowTable" --><!-- doxytag: inherits="stk::Function" -->
<p>STK bowed string table class.  
<a href="#_details">More...</a></p>

<p><code>#include &lt;<a class="el" href="BowTable_8h_source.html">BowTable.h</a>&gt;</code></p>
<div class="dynheader">
Inheritance diagram for stk::BowTable:</div>
<div class="dynsection">
 <div class="center">
  <img src="classstk_1_1BowTable.png" usemap="#stk::BowTable_map" alt=""/>
  <map id="stk::BowTable_map" name="stk::BowTable_map">
<area href="classstk_1_1Function.html" alt="stk::Function" shape="rect" coords="0,56,88,80"/>
<area href="classstk_1_1Stk.html" alt="stk::Stk" shape="rect" coords="0,0,88,24"/>
</map>
 </div>
</div>

<p><a href="classstk_1_1BowTable-members.html">List of all members.</a></p>
<table border="0" cellpadding="0" cellspacing="0">
<tr><td colspan="2"><h2>Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a25d0985fd6821a7e1608af1e8f51952a"></a><!-- doxytag: member="stk::BowTable::BowTable" ref="a25d0985fd6821a7e1608af1e8f51952a" args="(void)" -->
&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1BowTable.html#a25d0985fd6821a7e1608af1e8f51952a">BowTable</a> (void)</td></tr>
<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Default constructor. <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1BowTable.html#a9adcc3c36085b73d3b877828071a3b2c">setOffset</a> (StkFloat offset)</td></tr>
<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Set the table offset value.  <a href="#a9adcc3c36085b73d3b877828071a3b2c"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1BowTable.html#ad8391e46941ff9f49b78bf4f77c35143">setSlope</a> (StkFloat slope)</td></tr>
<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Set the table slope value.  <a href="#ad8391e46941ff9f49b78bf4f77c35143"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a9540d5c56cfd4556ab25c25f0612b25d"></a><!-- doxytag: member="stk::BowTable::setMinOutput" ref="a9540d5c56cfd4556ab25c25f0612b25d" args="(StkFloat minimum)" -->
void&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1BowTable.html#a9540d5c56cfd4556ab25c25f0612b25d">setMinOutput</a> (StkFloat minimum)</td></tr>
<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Set the minimum table output value (0.0 - 1.0). <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a634d5063eba886445f4057c823b00ff7"></a><!-- doxytag: member="stk::BowTable::setMaxOutput" ref="a634d5063eba886445f4057c823b00ff7" args="(StkFloat maximum)" -->
void&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1BowTable.html#a634d5063eba886445f4057c823b00ff7">setMaxOutput</a> (StkFloat maximum)</td></tr>
<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Set the maximum table output value (0.0 - 1.0). <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a8dc58c69ecda1471dce6d142cb5f4b19"></a><!-- doxytag: member="stk::BowTable::tick" ref="a8dc58c69ecda1471dce6d142cb5f4b19" args="(StkFloat input)" -->
StkFloat&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1BowTable.html#a8dc58c69ecda1471dce6d142cb5f4b19">tick</a> (StkFloat input)</td></tr>
<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Take one sample input and map to one sample of output. <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="classstk_1_1StkFrames.html">StkFrames</a> &amp;&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1BowTable.html#a8ad2766def014b62dcbbd8765e133246">tick</a> (<a class="el" href="classstk_1_1StkFrames.html">StkFrames</a> &amp;frames, unsigned int channel=0)</td></tr>
<tr><td class="mdescLeft">&nbsp;</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 table and replace with corresponding outputs.  <a href="#a8ad2766def014b62dcbbd8765e133246"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="classstk_1_1StkFrames.html">StkFrames</a> &amp;&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1BowTable.html#aaf72f823f210b18f417337ac7181cde5">tick</a> (<a class="el" href="classstk_1_1StkFrames.html">StkFrames</a> &amp;iFrames, <a class="el" href="classstk_1_1StkFrames.html">StkFrames</a> &amp;oFrames, unsigned int iChannel=0, unsigned int oChannel=0)</td></tr>
<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Take a channel of the <code>iFrames</code> object as inputs to the table and write outputs to the <code>oFrames</code> object.  <a href="#aaf72f823f210b18f417337ac7181cde5"></a><br/></td></tr>
</table>
<hr/><a name="_details"></a><h2>Detailed Description</h2>
<p>STK bowed string table class. </p>
<p>This class implements a simple bowed string non-linear function, as described by Smith (1986). The output is an instantaneous reflection coefficient value.</p>
<p>by Perry R. Cook and Gary P. Scavone, 1995-2012. </p>
<hr/><h2>Member Function Documentation</h2>
<a class="anchor" id="a9adcc3c36085b73d3b877828071a3b2c"></a><!-- doxytag: member="stk::BowTable::setOffset" ref="a9adcc3c36085b73d3b877828071a3b2c" args="(StkFloat offset)" -->
<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">void stk::BowTable::setOffset </td>
          <td>(</td>
          <td class="paramtype">StkFloat&nbsp;</td>
          <td class="paramname"> <em>offset</em></td>
          <td>&nbsp;)&nbsp;</td>
          <td><code> [inline]</code></td>
        </tr>
      </table>
</div>
<div class="memdoc">

<p>Set the table offset value. </p>
<p>The table offset is a bias which controls the symmetry of the friction. If you want the friction to vary with direction, use a non-zero value for the offset. The default value is zero. </p>

<p><div class="fragment"><pre class="fragment"><a name="l00035"></a>00035 { offset_ = offset; };
</pre></div></p>

</div>
</div>
<a class="anchor" id="ad8391e46941ff9f49b78bf4f77c35143"></a><!-- doxytag: member="stk::BowTable::setSlope" ref="ad8391e46941ff9f49b78bf4f77c35143" args="(StkFloat slope)" -->
<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">void stk::BowTable::setSlope </td>
          <td>(</td>
          <td class="paramtype">StkFloat&nbsp;</td>
          <td class="paramname"> <em>slope</em></td>
          <td>&nbsp;)&nbsp;</td>
          <td><code> [inline]</code></td>
        </tr>
      </table>
</div>
<div class="memdoc">

<p>Set the table slope value. </p>
<p>The table slope controls the width of the friction pulse, which is related to bow force. </p>

<p><div class="fragment"><pre class="fragment"><a name="l00042"></a>00042 { slope_ = slope; };
</pre></div></p>

</div>
</div>
<a class="anchor" id="a8ad2766def014b62dcbbd8765e133246"></a><!-- doxytag: member="stk::BowTable::tick" ref="a8ad2766def014b62dcbbd8765e133246" args="(StkFrames &amp;frames, unsigned int channel=0)" -->
<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname"><a class="el" href="classstk_1_1StkFrames.html">StkFrames</a> &amp; stk::BowTable::tick </td>
          <td>(</td>
          <td class="paramtype"><a class="el" href="classstk_1_1StkFrames.html">StkFrames</a> &amp;&nbsp;</td>
          <td class="paramname"> <em>frames</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">unsigned int&nbsp;</td>
          <td class="paramname"> <em>channel</em> = <code>0</code></td><td>&nbsp;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td></td><td><code> [inline]</code></td>
        </tr>
      </table>
</div>
<div class="memdoc">

<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 table and replace with corresponding outputs. </p>
<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 <code>channel</code> argument must be less than the number of channels in 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>

<p><div class="fragment"><pre class="fragment"><a name="l00102"></a>00102 {
<a name="l00103"></a>00103 <span class="preprocessor">#if defined(_STK_DEBUG_)</span>
<a name="l00104"></a>00104 <span class="preprocessor"></span>  <span class="keywordflow">if</span> ( channel &gt;= frames.channels() ) {
<a name="l00105"></a>00105     oStream_ &lt;&lt; <span class="stringliteral">&quot;BowTable::tick(): channel and StkFrames arguments are incompatible!&quot;</span>;
<a name="l00106"></a>00106     <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 );
<a name="l00107"></a>00107   }
<a name="l00108"></a>00108 <span class="preprocessor">#endif</span>
<a name="l00109"></a>00109 <span class="preprocessor"></span>
<a name="l00110"></a>00110   StkFloat *samples = &amp;frames[channel];
<a name="l00111"></a>00111   <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> hop = frames.channels();
<a name="l00112"></a>00112   <span class="keywordflow">for</span> ( <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i=0; i&lt;frames.frames(); i++, samples += hop ) {
<a name="l00113"></a>00113     *samples = *samples + offset_;
<a name="l00114"></a>00114     *samples *= slope_;
<a name="l00115"></a>00115     *samples = (StkFloat) fabs( (<span class="keywordtype">double</span>) *samples ) + 0.75;
<a name="l00116"></a>00116     *samples = (StkFloat) pow( *samples, (StkFloat) -4.0 );
<a name="l00117"></a>00117     <span class="keywordflow">if</span> ( *samples &gt; 1.0) *samples = 1.0;
<a name="l00118"></a>00118   }
<a name="l00119"></a>00119 
<a name="l00120"></a>00120   lastFrame_[0] = *(samples-hop);
<a name="l00121"></a>00121   <span class="keywordflow">return</span> frames;
<a name="l00122"></a>00122 }
</pre></div></p>

</div>
</div>
<a class="anchor" id="aaf72f823f210b18f417337ac7181cde5"></a><!-- doxytag: member="stk::BowTable::tick" ref="aaf72f823f210b18f417337ac7181cde5" args="(StkFrames &amp;iFrames, StkFrames &amp;oFrames, unsigned int iChannel=0, unsigned int oChannel=0)" -->
<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname"><a class="el" href="classstk_1_1StkFrames.html">StkFrames</a> &amp; stk::BowTable::tick </td>
          <td>(</td>
          <td class="paramtype"><a class="el" href="classstk_1_1StkFrames.html">StkFrames</a> &amp;&nbsp;</td>
          <td class="paramname"> <em>iFrames</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype"><a class="el" href="classstk_1_1StkFrames.html">StkFrames</a> &amp;&nbsp;</td>
          <td class="paramname"> <em>oFrames</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">unsigned int&nbsp;</td>
          <td class="paramname"> <em>iChannel</em> = <code>0</code>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">unsigned int&nbsp;</td>
          <td class="paramname"> <em>oChannel</em> = <code>0</code></td><td>&nbsp;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td></td><td><code> [inline]</code></td>
        </tr>
      </table>
</div>
<div class="memdoc">

<p>Take a channel of the <code>iFrames</code> object as inputs to the table and write outputs to the <code>oFrames</code> object. </p>
<p>The <code>iFrames</code> object reference is returned. Each channel argument must be less than the number of channels in the corresponding <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>

<p><div class="fragment"><pre class="fragment"><a name="l00125"></a>00125 {
<a name="l00126"></a>00126 <span class="preprocessor">#if defined(_STK_DEBUG_)</span>
<a name="l00127"></a>00127 <span class="preprocessor"></span>  <span class="keywordflow">if</span> ( iChannel &gt;= iFrames.channels() || oChannel &gt;= oFrames.channels() ) {
<a name="l00128"></a>00128     oStream_ &lt;&lt; <span class="stringliteral">&quot;BowTable::tick(): channel and StkFrames arguments are incompatible!&quot;</span>;
<a name="l00129"></a>00129     <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 );
<a name="l00130"></a>00130   }
<a name="l00131"></a>00131 <span class="preprocessor">#endif</span>
<a name="l00132"></a>00132 <span class="preprocessor"></span>
<a name="l00133"></a>00133   StkFloat *iSamples = &amp;iFrames[iChannel];
<a name="l00134"></a>00134   StkFloat *oSamples = &amp;oFrames[oChannel];
<a name="l00135"></a>00135   <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> iHop = iFrames.channels(), oHop = oFrames.channels();
<a name="l00136"></a>00136   <span class="keywordflow">for</span> ( <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i=0; i&lt;iFrames.frames(); i++, iSamples += iHop, oSamples += oHop ) {
<a name="l00137"></a>00137     *oSamples = *iSamples + offset_;
<a name="l00138"></a>00138     *oSamples *= slope_;
<a name="l00139"></a>00139     *oSamples = (StkFloat) fabs( (<span class="keywordtype">double</span>) *oSamples ) + 0.75;
<a name="l00140"></a>00140     *oSamples = (StkFloat) pow( *oSamples, (StkFloat) -4.0 );
<a name="l00141"></a>00141     <span class="keywordflow">if</span> ( *oSamples &gt; 1.0) *oSamples = 1.0;
<a name="l00142"></a>00142   }
<a name="l00143"></a>00143 
<a name="l00144"></a>00144   lastFrame_[0] = *(oSamples-oHop);
<a name="l00145"></a>00145   <span class="keywordflow">return</span> iFrames;
<a name="l00146"></a>00146 }
</pre></div></p>

</div>
</div>
<hr/>The documentation for this class was generated from the following file:<ul>
<li><a class="el" href="BowTable_8h_source.html">BowTable.h</a></li>
</ul>
</div>
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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>
  <tr><td>&copy;1995-2012 Perry R. Cook and Gary P. Scavone. All Rights Reserved.</td></tr>
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