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<HTML>
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<TITLE>The Synthesis ToolKit in C++ (STK)</TITLE>
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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 class="contents">
<h1>stk::DelayL Class Reference</h1><!-- doxytag: class="stk::DelayL" --><!-- doxytag: inherits="stk::Filter" -->
<p>STK linear interpolating delay line class.
<a href="#_details">More...</a></p>
<p><code>#include <<a class="el" href="DelayL_8h_source.html">DelayL.h</a>></code></p>
<div class="dynheader">
Inheritance diagram for stk::DelayL:</div>
<div class="dynsection">
<div class="center">
<img src="classstk_1_1DelayL.png" usemap="#stk::DelayL_map" alt=""/>
<map id="stk::DelayL_map" name="stk::DelayL_map">
<area href="classstk_1_1Filter.html" alt="stk::Filter" shape="rect" coords="0,56,73,80"/>
<area href="classstk_1_1Stk.html" alt="stk::Stk" shape="rect" coords="0,0,73,24"/>
</map>
</div>
</div>
<p><a href="classstk_1_1DelayL-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"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1DelayL.html#ad60f2222397e19fe524fc3b76b59b846">DelayL</a> (StkFloat delay=0.0, unsigned long maxDelay=4095)</td></tr>
<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="#ad60f2222397e19fe524fc3b76b59b846"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a8f9b49c7b098d9e379baf44b0c345457"></a><!-- doxytag: member="stk::DelayL::~DelayL" ref="a8f9b49c7b098d9e379baf44b0c345457" args="()" -->
</td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1DelayL.html#a8f9b49c7b098d9e379baf44b0c345457">~DelayL</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Class destructor. <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="acbcb8326db134a26fdad5f16f1a0ba7e"></a><!-- doxytag: member="stk::DelayL::getMaximumDelay" ref="acbcb8326db134a26fdad5f16f1a0ba7e" args="(void)" -->
unsigned long </td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1DelayL.html#acbcb8326db134a26fdad5f16f1a0ba7e">getMaximumDelay</a> (void)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Get the maximum delay-line length. <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1DelayL.html#a18b40806591654a9c9c32603990fce40">setMaximumDelay</a> (unsigned long delay)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Set the maximum delay-line length. <a href="#a18b40806591654a9c9c32603990fce40"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1DelayL.html#a80dd30628502a7c3b37ff045176eb91f">setDelay</a> (StkFloat delay)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Set the delay-line length. <a href="#a80dd30628502a7c3b37ff045176eb91f"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="aaf2d5ef7dba47ff1fb279c327021beb0"></a><!-- doxytag: member="stk::DelayL::getDelay" ref="aaf2d5ef7dba47ff1fb279c327021beb0" args="(void) const " -->
StkFloat </td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1DelayL.html#aaf2d5ef7dba47ff1fb279c327021beb0">getDelay</a> (void) const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return the current delay-line length. <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">StkFloat </td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1DelayL.html#ad16a1f176e93a9beb8e685aafa32579e">tapOut</a> (unsigned long tapDelay)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return the value at <em>tapDelay</em> samples from the delay-line input. <a href="#ad16a1f176e93a9beb8e685aafa32579e"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a984843567ba3de6543bd13c23457f495"></a><!-- doxytag: member="stk::DelayL::tapIn" ref="a984843567ba3de6543bd13c23457f495" args="(StkFloat value, unsigned long tapDelay)" -->
void </td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1DelayL.html#a984843567ba3de6543bd13c23457f495">tapIn</a> (StkFloat value, unsigned long tapDelay)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Set the <em>value</em> at <em>tapDelay</em> samples from the delay-line input. <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a16810ca38fab79276bb8ec51447623a9"></a><!-- doxytag: member="stk::DelayL::lastOut" ref="a16810ca38fab79276bb8ec51447623a9" args="(void) const " -->
StkFloat </td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1DelayL.html#a16810ca38fab79276bb8ec51447623a9">lastOut</a> (void) const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return the last computed output value. <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">StkFloat </td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1DelayL.html#abfe69d19690fab75b6026dab96870fb8">nextOut</a> (void)</td></tr>
<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#a1d01bbaf40cc20a0b70241bb8072da7f" title="Input one sample to the filter and return one output.">tick()</a>. <a href="#abfe69d19690fab75b6026dab96870fb8"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a1d01bbaf40cc20a0b70241bb8072da7f"></a><!-- doxytag: member="stk::DelayL::tick" ref="a1d01bbaf40cc20a0b70241bb8072da7f" args="(StkFloat input)" -->
StkFloat </td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1DelayL.html#a1d01bbaf40cc20a0b70241bb8072da7f">tick</a> (StkFloat input)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Input one sample to the filter and return one output. <br/></td></tr>
<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_1DelayL.html#acdc5d41de53c53d9d4b39ee8a46fb96c">tick</a> (<a class="el" href="classstk_1_1StkFrames.html">StkFrames</a> &frames, unsigned int channel=0)</td></tr>
<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="#acdc5d41de53c53d9d4b39ee8a46fb96c"></a><br/></td></tr>
<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_1DelayL.html#a56ee486fb01fbf45d5a3dbad754a838e">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>
<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="#a56ee486fb01fbf45d5a3dbad754a838e"></a><br/></td></tr>
</table>
<hr/><a name="_details"></a><h2>Detailed Description</h2>
<p>STK linear interpolating delay line class. </p>
<p>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>
<p>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>
<p>by Perry R. Cook and Gary P. Scavone, 1995-2012. </p>
<hr/><h2>Constructor & Destructor Documentation</h2>
<a class="anchor" id="ad60f2222397e19fe524fc3b76b59b846"></a><!-- doxytag: member="stk::DelayL::DelayL" ref="ad60f2222397e19fe524fc3b76b59b846" args="(StkFloat delay=0.0, unsigned long maxDelay=4095)" -->
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<td class="memname">stk::DelayL::DelayL </td>
<td>(</td>
<td class="paramtype">StkFloat </td>
<td class="paramname"> <em>delay</em> = <code>0.0</code>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">unsigned long </td>
<td class="paramname"> <em>maxDelay</em> = <code>4095</code></td><td> </td>
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<td></td>
<td>)</td>
<td></td><td></td><td></td>
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<div class="memdoc">
<p>Default constructor creates a delay-line with maximum length of 4095 samples and zero delay. </p>
<p>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. </p>
</div>
</div>
<hr/><h2>Member Function Documentation</h2>
<a class="anchor" id="a18b40806591654a9c9c32603990fce40"></a><!-- doxytag: member="stk::DelayL::setMaximumDelay" ref="a18b40806591654a9c9c32603990fce40" args="(unsigned long delay)" -->
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<td class="memname">void stk::DelayL::setMaximumDelay </td>
<td>(</td>
<td class="paramtype">unsigned long </td>
<td class="paramname"> <em>delay</em></td>
<td> ) </td>
<td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Set the maximum delay-line length. </p>
<p>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#a1d01bbaf40cc20a0b70241bb8072da7f" 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#a670b9cc23ac798d3239cb819e801363c" 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 memory allocation change is made. </p>
</div>
</div>
<a class="anchor" id="a80dd30628502a7c3b37ff045176eb91f"></a><!-- doxytag: member="stk::DelayL::setDelay" ref="a80dd30628502a7c3b37ff045176eb91f" args="(StkFloat delay)" -->
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<td class="memname">void stk::DelayL::setDelay </td>
<td>(</td>
<td class="paramtype">StkFloat </td>
<td class="paramname"> <em>delay</em></td>
<td> ) </td>
<td></td>
</tr>
</table>
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<div class="memdoc">
<p>Set the delay-line length. </p>
<p>The valid range for <em>delay</em> is from 0 to the maximum delay-line length. </p>
</div>
</div>
<a class="anchor" id="ad16a1f176e93a9beb8e685aafa32579e"></a><!-- doxytag: member="stk::DelayL::tapOut" ref="ad16a1f176e93a9beb8e685aafa32579e" args="(unsigned long tapDelay)" -->
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<td class="memname">StkFloat stk::DelayL::tapOut </td>
<td>(</td>
<td class="paramtype">unsigned long </td>
<td class="paramname"> <em>tapDelay</em></td>
<td> ) </td>
<td></td>
</tr>
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<div class="memdoc">
<p>Return the value at <em>tapDelay</em> samples from the delay-line input. </p>
<p>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). </p>
</div>
</div>
<a class="anchor" id="abfe69d19690fab75b6026dab96870fb8"></a><!-- doxytag: member="stk::DelayL::nextOut" ref="abfe69d19690fab75b6026dab96870fb8" args="(void)" -->
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<td class="memname">StkFloat stk::DelayL::nextOut </td>
<td>(</td>
<td class="paramtype">void </td>
<td class="paramname"></td>
<td> ) </td>
<td><code> [inline]</code></td>
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<p>Return the value which will be output by the next call to <a class="el" href="classstk_1_1DelayL.html#a1d01bbaf40cc20a0b70241bb8072da7f" title="Input one sample to the filter and return one output.">tick()</a>. </p>
<p>This method is valid only for delay settings greater than zero! </p>
<p><div class="fragment"><pre class="fragment"><a name="l00121"></a>00121 {
<a name="l00122"></a>00122 <span class="keywordflow">if</span> ( doNextOut_ ) {
<a name="l00123"></a>00123 <span class="comment">// First 1/2 of interpolation</span>
<a name="l00124"></a>00124 nextOutput_ = inputs_[outPoint_] * omAlpha_;
<a name="l00125"></a>00125 <span class="comment">// Second 1/2 of interpolation</span>
<a name="l00126"></a>00126 <span class="keywordflow">if</span> (outPoint_+1 < inputs_.size())
<a name="l00127"></a>00127 nextOutput_ += inputs_[outPoint_+1] * alpha_;
<a name="l00128"></a>00128 <span class="keywordflow">else</span>
<a name="l00129"></a>00129 nextOutput_ += inputs_[0] * alpha_;
<a name="l00130"></a>00130 doNextOut_ = <span class="keyword">false</span>;
<a name="l00131"></a>00131 }
<a name="l00132"></a>00132
<a name="l00133"></a>00133 <span class="keywordflow">return</span> nextOutput_;
<a name="l00134"></a>00134 }
</pre></div></p>
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<a class="anchor" id="acdc5d41de53c53d9d4b39ee8a46fb96c"></a><!-- doxytag: member="stk::DelayL::tick" ref="acdc5d41de53c53d9d4b39ee8a46fb96c" 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>
<td>(</td>
<td class="paramtype"><a class="el" href="classstk_1_1StkFrames.html">StkFrames</a> & </td>
<td class="paramname"> <em>frames</em>, </td>
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<td></td>
<td class="paramtype">unsigned int </td>
<td class="paramname"> <em>channel</em> = <code>0</code></td><td> </td>
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<td></td><td></td><td><code> [inline, virtual]</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 filter 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>Implements <a class="el" href="classstk_1_1Filter.html#a3260a238824c4a748ac057b84b7d3f21">stk::Filter</a>.</p>
<p><div class="fragment"><pre class="fragment"><a name="l00155"></a>00155 {
<a name="l00156"></a>00156 <span class="preprocessor">#if defined(_STK_DEBUG_)</span>
<a name="l00157"></a>00157 <span class="preprocessor"></span> <span class="keywordflow">if</span> ( channel >= frames.channels() ) {
<a name="l00158"></a>00158 oStream_ << <span class="stringliteral">"DelayL::tick(): channel and StkFrames arguments are incompatible!"</span>;
<a name="l00159"></a>00159 <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="l00160"></a>00160 }
<a name="l00161"></a>00161 <span class="preprocessor">#endif</span>
<a name="l00162"></a>00162 <span class="preprocessor"></span>
<a name="l00163"></a>00163 StkFloat *samples = &frames[channel];
<a name="l00164"></a>00164 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> hop = frames.channels();
<a name="l00165"></a>00165 <span class="keywordflow">for</span> ( <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i=0; i<frames.frames(); i++, samples += hop ) {
<a name="l00166"></a>00166 inputs_[inPoint_++] = *samples * gain_;
<a name="l00167"></a>00167 <span class="keywordflow">if</span> ( inPoint_ == inputs_.size() ) inPoint_ = 0;
<a name="l00168"></a>00168 *samples = <a class="code" href="classstk_1_1DelayL.html#abfe69d19690fab75b6026dab96870fb8" title="Return the value which will be output by the next call to tick().">nextOut</a>();
<a name="l00169"></a>00169 doNextOut_ = <span class="keyword">true</span>;
<a name="l00170"></a>00170 <span class="keywordflow">if</span> ( ++outPoint_ == inputs_.size() ) outPoint_ = 0;
<a name="l00171"></a>00171 }
<a name="l00172"></a>00172
<a name="l00173"></a>00173 lastFrame_[0] = *(samples-hop);
<a name="l00174"></a>00174 <span class="keywordflow">return</span> frames;
<a name="l00175"></a>00175 }
</pre></div></p>
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<a class="anchor" id="a56ee486fb01fbf45d5a3dbad754a838e"></a><!-- doxytag: member="stk::DelayL::tick" ref="a56ee486fb01fbf45d5a3dbad754a838e" 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>
<td>(</td>
<td class="paramtype"><a class="el" href="classstk_1_1StkFrames.html">StkFrames</a> & </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> & </td>
<td class="paramname"> <em>oFrames</em>, </td>
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<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">unsigned int </td>
<td class="paramname"> <em>iChannel</em> = <code>0</code>, </td>
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<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">unsigned int </td>
<td class="paramname"> <em>oChannel</em> = <code>0</code></td><td> </td>
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<td></td>
<td>)</td>
<td></td><td></td><td><code> [inline]</code></td>
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<p>Take a channel of the <code>iFrames</code> object as inputs to the filter 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="l00178"></a>00178 {
<a name="l00179"></a>00179 <span class="preprocessor">#if defined(_STK_DEBUG_)</span>
<a name="l00180"></a>00180 <span class="preprocessor"></span> <span class="keywordflow">if</span> ( iChannel >= iFrames.channels() || oChannel >= oFrames.channels() ) {
<a name="l00181"></a>00181 oStream_ << <span class="stringliteral">"DelayL::tick(): channel and StkFrames arguments are incompatible!"</span>;
<a name="l00182"></a>00182 <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="l00183"></a>00183 }
<a name="l00184"></a>00184 <span class="preprocessor">#endif</span>
<a name="l00185"></a>00185 <span class="preprocessor"></span>
<a name="l00186"></a>00186 StkFloat *iSamples = &iFrames[iChannel];
<a name="l00187"></a>00187 StkFloat *oSamples = &oFrames[oChannel];
<a name="l00188"></a>00188 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> iHop = iFrames.channels(), oHop = oFrames.channels();
<a name="l00189"></a>00189 <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 ) {
<a name="l00190"></a>00190 inputs_[inPoint_++] = *iSamples * gain_;
<a name="l00191"></a>00191 <span class="keywordflow">if</span> ( inPoint_ == inputs_.size() ) inPoint_ = 0;
<a name="l00192"></a>00192 *oSamples = <a class="code" href="classstk_1_1DelayL.html#abfe69d19690fab75b6026dab96870fb8" title="Return the value which will be output by the next call to tick().">nextOut</a>();
<a name="l00193"></a>00193 doNextOut_ = <span class="keyword">true</span>;
<a name="l00194"></a>00194 <span class="keywordflow">if</span> ( ++outPoint_ == inputs_.size() ) outPoint_ = 0;
<a name="l00195"></a>00195 }
<a name="l00196"></a>00196
<a name="l00197"></a>00197 lastFrame_[0] = *(oSamples-oHop);
<a name="l00198"></a>00198 <span class="keywordflow">return</span> iFrames;
<a name="l00199"></a>00199 }
</pre></div></p>
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<hr/>The documentation for this class was generated from the following file:<ul>
<li><a class="el" href="DelayL_8h_source.html">DelayL.h</a></li>
</ul>
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