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<TITLE>The Synthesis ToolKit in C++ (STK)</TITLE>
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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 1.5.8 -->
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<div class="navpath"><a class="el" href="namespacestk.html">stk</a>::<a class="el" href="classstk_1_1DelayL.html">DelayL</a>
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</div>
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<div class="contents">
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<h1>stk::DelayL Class Reference</h1><!-- doxytag: class="stk::DelayL" --><!-- doxytag: inherits="stk::Filter" -->STK linear interpolating delay line class.
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<a href="#_details">More...</a>
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<p>
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<code>#include <<a class="el" href="DelayL_8h-source.html">DelayL.h</a>></code>
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<p>
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<div class="dynheader">
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Inheritance diagram for stk::DelayL:</div>
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<div class="dynsection">
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<p><center><img src="classstk_1_1DelayL.png" usemap="#stk::DelayL_map" border="0" alt=""></center>
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<map name="stk::DelayL_map">
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<area href="classstk_1_1Filter.html" alt="stk::Filter" shape="rect" coords="0,56,73,80">
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<area href="classstk_1_1Stk.html" alt="stk::Stk" shape="rect" coords="0,0,73,24">
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</map>
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</div>
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<p>
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<a href="classstk_1_1DelayL-members.html">List of all members.</a><table border="0" cellpadding="0" cellspacing="0">
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<tr><td></td></tr>
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<tr><td colspan="2"><br><h2>Public Member Functions</h2></td></tr>
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<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1DelayL.html#d60f2222397e19fe524fc3b76b59b846">DelayL</a> (StkFloat delay=0.0, unsigned long maxDelay=4095)</td></tr>
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<tr><td class="mdescLeft"> </td><td class="mdescRight">Default constructor creates a delay-line with maximum length of 4095 samples and zero delay. <a href="#d60f2222397e19fe524fc3b76b59b846"></a><br></td></tr>
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<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="8f9b49c7b098d9e379baf44b0c345457"></a><!-- doxytag: member="stk::DelayL::~DelayL" ref="8f9b49c7b098d9e379baf44b0c345457" args="()" -->
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</td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1DelayL.html#8f9b49c7b098d9e379baf44b0c345457">~DelayL</a> ()</td></tr>
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<tr><td class="mdescLeft"> </td><td class="mdescRight">Class destructor. <br></td></tr>
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<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1DelayL.html#18b40806591654a9c9c32603990fce40">setMaximumDelay</a> (unsigned long delay)</td></tr>
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<tr><td class="mdescLeft"> </td><td class="mdescRight">Set the maximum delay-line length. <a href="#18b40806591654a9c9c32603990fce40"></a><br></td></tr>
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<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1DelayL.html#80dd30628502a7c3b37ff045176eb91f">setDelay</a> (StkFloat delay)</td></tr>
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<tr><td class="mdescLeft"> </td><td class="mdescRight">Set the delay-line length. <a href="#80dd30628502a7c3b37ff045176eb91f"></a><br></td></tr>
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<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="af2d5ef7dba47ff1fb279c327021beb0"></a><!-- doxytag: member="stk::DelayL::getDelay" ref="af2d5ef7dba47ff1fb279c327021beb0" args="(void) const " -->
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StkFloat </td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1DelayL.html#af2d5ef7dba47ff1fb279c327021beb0">getDelay</a> (void) const </td></tr>
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<tr><td class="mdescLeft"> </td><td class="mdescRight">Return the current delay-line length. <br></td></tr>
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<tr><td class="memItemLeft" nowrap align="right" valign="top">StkFloat </td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1DelayL.html#7a84a3a188f2de7cc05f81ad06e04874">contentsAt</a> (unsigned long tapDelay)</td></tr>
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<tr><td class="mdescLeft"> </td><td class="mdescRight">Return the value at <em>tapDelay</em> samples from the delay-line input. <a href="#7a84a3a188f2de7cc05f81ad06e04874"></a><br></td></tr>
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<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="16810ca38fab79276bb8ec51447623a9"></a><!-- doxytag: member="stk::DelayL::lastOut" ref="16810ca38fab79276bb8ec51447623a9" args="(void) const " -->
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StkFloat </td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1DelayL.html#16810ca38fab79276bb8ec51447623a9">lastOut</a> (void) const </td></tr>
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<tr><td class="mdescLeft"> </td><td class="mdescRight">Return the last computed output value. <br></td></tr>
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<tr><td class="memItemLeft" nowrap align="right" valign="top">StkFloat </td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1DelayL.html#bfe69d19690fab75b6026dab96870fb8">nextOut</a> (void)</td></tr>
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<tr><td class="mdescLeft"> </td><td class="mdescRight">Return the value which will be output by the next call to <a class="el" href="classstk_1_1DelayL.html#1d01bbaf40cc20a0b70241bb8072da7f" title="Input one sample to the filter and return one output.">tick()</a>. <a href="#bfe69d19690fab75b6026dab96870fb8"></a><br></td></tr>
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<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="1d01bbaf40cc20a0b70241bb8072da7f"></a><!-- doxytag: member="stk::DelayL::tick" ref="1d01bbaf40cc20a0b70241bb8072da7f" args="(StkFloat input)" -->
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StkFloat </td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1DelayL.html#1d01bbaf40cc20a0b70241bb8072da7f">tick</a> (StkFloat input)</td></tr>
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<tr><td class="mdescLeft"> </td><td class="mdescRight">Input one sample to the filter and return one output. <br></td></tr>
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<tr><td class="memItemLeft" nowrap 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_1DelayL.html#cdc5d41de53c53d9d4b39ee8a46fb96c">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 filter and replace with corresponding outputs. <a href="#cdc5d41de53c53d9d4b39ee8a46fb96c"></a><br></td></tr>
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<tr><td class="memItemLeft" nowrap 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_1DelayL.html#56ee486fb01fbf45d5a3dbad754a838e">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 filter and write outputs to the <code>oFrames</code> object. <a href="#56ee486fb01fbf45d5a3dbad754a838e"></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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STK linear interpolating delay line class.
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<p>
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This class implements a fractional-length digital delay-line using first-order linear interpolation. If the delay and maximum length are not specified during instantiation, a fixed maximum length of 4095 and a delay of zero is set.<p>
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Linear interpolation is an efficient technique for achieving fractional delay lengths, though it does introduce high-frequency signal attenuation to varying degrees depending on the fractional delay setting. The use of higher order Lagrange interpolators can typically improve (minimize) this attenuation characteristic.<p>
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by Perry R. Cook and Gary P. Scavone, 1995 - 2009. <hr><h2>Constructor & Destructor Documentation</h2>
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<a class="anchor" name="d60f2222397e19fe524fc3b76b59b846"></a><!-- doxytag: member="stk::DelayL::DelayL" ref="d60f2222397e19fe524fc3b76b59b846" args="(StkFloat delay=0.0, unsigned long maxDelay=4095)" -->
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<td class="memname">stk::DelayL::DelayL </td>
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<td>(</td>
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<td class="paramtype">StkFloat </td>
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<td class="paramname"> <em>delay</em> = <code>0.0</code>, </td>
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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 long </td>
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<td class="paramname"> <em>maxDelay</em> = <code>4095</code></td><td> </td>
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<td></td>
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<td>)</td>
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<td></td><td></td><td></td>
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</table>
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<div class="memdoc">
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<p>
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Default constructor creates a delay-line with maximum length of 4095 samples and zero delay.
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<p>
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An <a class="el" href="classstk_1_1StkError.html" title="STK error handling class.">StkError</a> will be thrown if the delay parameter is less than zero, the maximum delay parameter is less than one, or the delay parameter is greater than the maxDelay value.
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</div>
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</div><p>
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<hr><h2>Member Function Documentation</h2>
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<a class="anchor" name="18b40806591654a9c9c32603990fce40"></a><!-- doxytag: member="stk::DelayL::setMaximumDelay" ref="18b40806591654a9c9c32603990fce40" args="(unsigned long delay)" -->
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<td class="memname">void stk::DelayL::setMaximumDelay </td>
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<td>(</td>
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<td class="paramtype">unsigned long </td>
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<td class="paramname"> <em>delay</em> </td>
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<td> ) </td>
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<td></td>
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</table>
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</div>
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<div class="memdoc">
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<p>
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Set the maximum delay-line length.
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<p>
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This method should generally only be used during initial setup of the delay line. If it is used between calls to the <a class="el" href="classstk_1_1DelayL.html#1d01bbaf40cc20a0b70241bb8072da7f" title="Input one sample to the filter and return one output.">tick()</a> function, without a call to <a class="el" href="classstk_1_1Filter.html#670b9cc23ac798d3239cb819e801363c" title="Clears all internal states of the filter.">clear()</a>, a signal discontinuity will likely occur. If the current maximum length is greater than the new length, no change will be made.
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</div>
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</div><p>
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<a class="anchor" name="80dd30628502a7c3b37ff045176eb91f"></a><!-- doxytag: member="stk::DelayL::setDelay" ref="80dd30628502a7c3b37ff045176eb91f" args="(StkFloat delay)" -->
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<td class="memname">void stk::DelayL::setDelay </td>
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<td>(</td>
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<td class="paramtype">StkFloat </td>
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<td class="paramname"> <em>delay</em> </td>
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<td> ) </td>
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<td></td>
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</table>
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<div class="memdoc">
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<p>
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Set the delay-line length.
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<p>
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The valid range for <em>delay</em> is from 0 to the maximum delay-line length.
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</div>
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</div><p>
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<a class="anchor" name="7a84a3a188f2de7cc05f81ad06e04874"></a><!-- doxytag: member="stk::DelayL::contentsAt" ref="7a84a3a188f2de7cc05f81ad06e04874" args="(unsigned long tapDelay)" -->
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<td class="memname">StkFloat stk::DelayL::contentsAt </td>
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<td>(</td>
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<td class="paramtype">unsigned long </td>
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<td class="paramname"> <em>tapDelay</em> </td>
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<td> ) </td>
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<td></td>
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</div>
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<div class="memdoc">
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<p>
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Return the value at <em>tapDelay</em> samples from the delay-line input.
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<p>
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The tap point is determined modulo the delay-line length and is relative to the last input value (i.e., a tapDelay of zero returns the last input value).
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</div>
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</div><p>
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<a class="anchor" name="bfe69d19690fab75b6026dab96870fb8"></a><!-- doxytag: member="stk::DelayL::nextOut" ref="bfe69d19690fab75b6026dab96870fb8" args="(void)" -->
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<td class="memname">StkFloat stk::DelayL::nextOut </td>
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<td>(</td>
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<td class="paramtype">void </td>
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<td class="paramname"> </td>
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<td> ) </td>
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<td><code> [inline]</code></td>
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<div class="memdoc">
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<p>
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Return the value which will be output by the next call to <a class="el" href="classstk_1_1DelayL.html#1d01bbaf40cc20a0b70241bb8072da7f" title="Input one sample to the filter and return one output.">tick()</a>.
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<p>
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This method is valid only for delay settings greater than zero!
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</div>
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</div><p>
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<a class="anchor" name="cdc5d41de53c53d9d4b39ee8a46fb96c"></a><!-- doxytag: member="stk::DelayL::tick" ref="cdc5d41de53c53d9d4b39ee8a46fb96c" 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::DelayL::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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<td></td>
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<td>)</td>
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<td></td><td></td><td><code> [inline, virtual]</code></td>
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<p>
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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 filter and replace with corresponding outputs.
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<p>
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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.
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<p>Implements <a class="el" href="classstk_1_1Filter.html#3260a238824c4a748ac057b84b7d3f21">stk::Filter</a>.</p>
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</div>
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</div><p>
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<a class="anchor" name="56ee486fb01fbf45d5a3dbad754a838e"></a><!-- doxytag: member="stk::DelayL::tick" ref="56ee486fb01fbf45d5a3dbad754a838e" 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::DelayL::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>iFrames</em>, </td>
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<td class="paramkey"></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>oFrames</em>, </td>
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<td class="paramkey"></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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<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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<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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<div class="memdoc">
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<p>
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Take a channel of the <code>iFrames</code> object as inputs to the filter and write outputs to the <code>oFrames</code> object.
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<p>
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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.
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</div>
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</div><p>
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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="DelayL_8h-source.html">DelayL.h</a></ul>
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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>©1995-2009 Perry R. Cook and Gary P. Scavone. All Rights Reserved.</td></tr>
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