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291 lines
18 KiB
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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_1DelayA.html">DelayA</a>
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</div>
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<div class="contents">
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<h1>stk::DelayA Class Reference</h1><!-- doxytag: class="stk::DelayA" --><!-- doxytag: inherits="stk::Filter" -->STK allpass 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="DelayA_8h-source.html">DelayA.h</a>></code>
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<div class="dynheader">
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Inheritance diagram for stk::DelayA:</div>
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<div class="dynsection">
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<p><center><img src="classstk_1_1DelayA.png" usemap="#stk::DelayA_map" border="0" alt=""></center>
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<map name="stk::DelayA_map">
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<area href="classstk_1_1Filter.html" alt="stk::Filter" shape="rect" coords="0,56,75,80">
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<area href="classstk_1_1Stk.html" alt="stk::Stk" shape="rect" coords="0,0,75,24">
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</map>
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</div>
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<p>
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<a href="classstk_1_1DelayA-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_1DelayA.html#9beb31f924bca961df99c1ea7789c42d">DelayA</a> (StkFloat delay=0.5, 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 delay = 0.5. <a href="#9beb31f924bca961df99c1ea7789c42d"></a><br></td></tr>
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<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="b6f2ee45d350b4bb3515fcdaf25a986a"></a><!-- doxytag: member="stk::DelayA::~DelayA" ref="b6f2ee45d350b4bb3515fcdaf25a986a" args="()" -->
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</td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1DelayA.html#b6f2ee45d350b4bb3515fcdaf25a986a">~DelayA</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"><a class="anchor" name="e5e59f497eb84280fd94d60257ffae69"></a><!-- doxytag: member="stk::DelayA::clear" ref="e5e59f497eb84280fd94d60257ffae69" args="(void)" -->
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void </td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1DelayA.html#e5e59f497eb84280fd94d60257ffae69">clear</a> (void)</td></tr>
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<tr><td class="mdescLeft"> </td><td class="mdescRight">Clears all internal states of the delay line. <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_1DelayA.html#b10bb5eb8316ce8b3c6667bdf4c98389">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="#b10bb5eb8316ce8b3c6667bdf4c98389"></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_1DelayA.html#83ddc9bdf2f5059159160fdac0e25eda">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="#83ddc9bdf2f5059159160fdac0e25eda"></a><br></td></tr>
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<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="363d9ccc50acbd1f3bb533aa1ab3d9c7"></a><!-- doxytag: member="stk::DelayA::getDelay" ref="363d9ccc50acbd1f3bb533aa1ab3d9c7" args="(void) const " -->
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StkFloat </td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1DelayA.html#363d9ccc50acbd1f3bb533aa1ab3d9c7">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_1DelayA.html#355422e50c1d2e89385f11aafffd064d">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="#355422e50c1d2e89385f11aafffd064d"></a><br></td></tr>
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<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="4372d0e178af1cb6ca465affddfb1566"></a><!-- doxytag: member="stk::DelayA::lastOut" ref="4372d0e178af1cb6ca465affddfb1566" args="(void) const " -->
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StkFloat </td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1DelayA.html#4372d0e178af1cb6ca465affddfb1566">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_1DelayA.html#08c8ade17cea4a54844f90d976b14314">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_1DelayA.html#e602abe91560fb5f141db52333359b74" title="Input one sample to the filter and return one output.">tick()</a>. <a href="#08c8ade17cea4a54844f90d976b14314"></a><br></td></tr>
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<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="e602abe91560fb5f141db52333359b74"></a><!-- doxytag: member="stk::DelayA::tick" ref="e602abe91560fb5f141db52333359b74" args="(StkFloat input)" -->
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StkFloat </td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1DelayA.html#e602abe91560fb5f141db52333359b74">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_1DelayA.html#57c568d56e5ed35926cfc23f83d48d98">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="#57c568d56e5ed35926cfc23f83d48d98"></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_1DelayA.html#94a2998c9b2d1697ed9a747973be0a89">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="#94a2998c9b2d1697ed9a747973be0a89"></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 allpass interpolating delay line class.
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<p>
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This class implements a fractional-length digital delay-line using a first-order allpass filter. If the delay and maximum length are not specified during instantiation, a fixed maximum length of 4095 and a delay of 0.5 is set.<p>
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An allpass filter has unity magnitude gain but variable phase delay properties, making it useful in achieving fractional delays without affecting a signal's frequency magnitude response. In order to achieve a maximally flat phase delay response, the minimum delay possible in this implementation is limited to a value of 0.5.<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="9beb31f924bca961df99c1ea7789c42d"></a><!-- doxytag: member="stk::DelayA::DelayA" ref="9beb31f924bca961df99c1ea7789c42d" args="(StkFloat delay=0.5, unsigned long maxDelay=4095)" -->
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<td class="memname">stk::DelayA::DelayA </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>0.5</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>
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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 delay = 0.5.
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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="b10bb5eb8316ce8b3c6667bdf4c98389"></a><!-- doxytag: member="stk::DelayA::setMaximumDelay" ref="b10bb5eb8316ce8b3c6667bdf4c98389" args="(unsigned long delay)" -->
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<td class="memname">void stk::DelayA::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_1DelayA.html#e602abe91560fb5f141db52333359b74" title="Input one sample to the filter and return one output.">tick()</a> function, without a call to <a class="el" href="classstk_1_1DelayA.html#e5e59f497eb84280fd94d60257ffae69" title="Clears all internal states of the delay line.">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="83ddc9bdf2f5059159160fdac0e25eda"></a><!-- doxytag: member="stk::DelayA::setDelay" ref="83ddc9bdf2f5059159160fdac0e25eda" args="(StkFloat delay)" -->
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<td class="memname">void stk::DelayA::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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<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 0.5 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="355422e50c1d2e89385f11aafffd064d"></a><!-- doxytag: member="stk::DelayA::contentsAt" ref="355422e50c1d2e89385f11aafffd064d" args="(unsigned long tapDelay)" -->
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<td class="memname">StkFloat stk::DelayA::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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</table>
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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="08c8ade17cea4a54844f90d976b14314"></a><!-- doxytag: member="stk::DelayA::nextOut" ref="08c8ade17cea4a54844f90d976b14314" args="(void)" -->
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<td class="memname">StkFloat stk::DelayA::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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</table>
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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_1DelayA.html#e602abe91560fb5f141db52333359b74" 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="57c568d56e5ed35926cfc23f83d48d98"></a><!-- doxytag: member="stk::DelayA::tick" ref="57c568d56e5ed35926cfc23f83d48d98" 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::DelayA::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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<div class="memdoc">
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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="94a2998c9b2d1697ed9a747973be0a89"></a><!-- doxytag: member="stk::DelayA::tick" ref="94a2998c9b2d1697ed9a747973be0a89" 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::DelayA::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></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="DelayA_8h-source.html">DelayA.h</a></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>©1995-2009 Perry R. Cook and Gary P. Scavone. All Rights Reserved.</td></tr>
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</table>
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