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158 lines
8.7 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 1.4.4 -->
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<h1>Blit Class Reference</h1><!-- doxytag: class="Blit" --><!-- doxytag: inherits="Generator" --><code>#include <<a class="el" href="Blit_8h-source.html">Blit.h</a>></code>
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<p>
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<p>Inheritance diagram for Blit:
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<p><center><img src="classBlit.png" usemap="#Blit_map" border="0" alt=""></center>
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<map name="Blit_map">
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<area href="classGenerator.html" alt="Generator" shape="rect" coords="0,56,69,80">
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<area href="classStk.html" alt="Stk" shape="rect" coords="0,0,69,24">
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</map>
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<a href="classBlit-members.html">List of all members.</a><hr><a name="_details"></a><h2>Detailed Description</h2>
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STK band-limited impulse train class.
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<p>
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This class generates a band-limited impulse train using a closed-form algorithm reported by Stilson and Smith in "Alias-Free Digital Synthesis of Classic Analog Waveforms", 1996. The user can specify both the fundamental frequency of the impulse train and the number of harmonics contained in the resulting signal.<p>
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The signal is normalized so that the peak value is +/-1.0.<p>
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If nHarmonics is 0, then the signal will contain all harmonics up to half the sample rate. Note, however, that this setting may produce aliasing in the signal when the frequency is changing (no automatic modification of the number of harmonics is performed by the <a class="el" href="classBlit.html#a5">setFrequency()</a> function).<p>
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Original code by Robin Davies, 2005. Revisions by Gary Scavone for STK, 2005.
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<p>
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<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"><a class="anchor" name="a0"></a><!-- doxytag: member="Blit::Blit" ref="a0" args="(StkFloat frequency=220.0)" -->
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</td><td class="memItemRight" valign="bottom"><a class="el" href="classBlit.html#a0">Blit</a> (StkFloat frequency=220.0)</td></tr>
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<tr><td class="mdescLeft"> </td><td class="mdescRight">Default constructor that initializes BLIT frequency to 220 Hz. <br></td></tr>
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<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="a1"></a><!-- doxytag: member="Blit::~Blit" ref="a1" args="()" -->
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</td><td class="memItemRight" valign="bottom"><a class="el" href="classBlit.html#a1">~Blit</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="a2"></a><!-- doxytag: member="Blit::reset" ref="a2" args="()" -->
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void </td><td class="memItemRight" valign="bottom"><a class="el" href="classBlit.html#a2">reset</a> ()</td></tr>
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<tr><td class="mdescLeft"> </td><td class="mdescRight">Resets the oscillator state and phase to 0. <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="classBlit.html#a3">setPhase</a> (StkFloat phase)</td></tr>
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<tr><td class="mdescLeft"> </td><td class="mdescRight">Set the phase of the signal. <a href="#a3"></a><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="classBlit.html#a4">getPhase</a> () const </td></tr>
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<tr><td class="mdescLeft"> </td><td class="mdescRight">Get the current phase of the signal. <a href="#a4"></a><br></td></tr>
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<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="a5"></a><!-- doxytag: member="Blit::setFrequency" ref="a5" args="(StkFloat frequency)" -->
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void </td><td class="memItemRight" valign="bottom"><a class="el" href="classBlit.html#a5">setFrequency</a> (StkFloat frequency)</td></tr>
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<tr><td class="mdescLeft"> </td><td class="mdescRight">Set the impulse train rate in terms of a frequency in Hz. <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="classBlit.html#a6">setHarmonics</a> (unsigned int nHarmonics=0)</td></tr>
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<tr><td class="mdescLeft"> </td><td class="mdescRight">Set the number of harmonics generated in the signal. <a href="#a6"></a><br></td></tr>
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</table>
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<hr><h2>Member Function Documentation</h2>
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<a class="anchor" name="a3"></a><!-- doxytag: member="Blit::setPhase" ref="a3" args="(StkFloat phase)" --><p>
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<table class="mdTable" cellpadding="2" cellspacing="0">
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<tr>
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<td class="mdRow">
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<table cellpadding="0" cellspacing="0" border="0">
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<td class="md" nowrap valign="top">void Blit::setPhase </td>
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<td class="md" valign="top">( </td>
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<td class="md" nowrap valign="top">StkFloat </td>
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<td class="mdname1" valign="top" nowrap> <em>phase</em> </td>
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<td class="md" valign="top"> ) </td>
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<td class="md" nowrap><code> [inline]</code></td>
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</tr>
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<td>
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<td>
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<p>
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Set the phase of the signal.
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<p>
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Set the phase of the signal, in the range 0 to 1. </td>
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</tr>
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</table>
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<a class="anchor" name="a4"></a><!-- doxytag: member="Blit::getPhase" ref="a4" args="() const " --><p>
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<table class="mdTable" cellpadding="2" cellspacing="0">
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<td class="mdRow">
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<table cellpadding="0" cellspacing="0" border="0">
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<td class="md" nowrap valign="top">StkFloat Blit::getPhase </td>
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<td class="md" valign="top">( </td>
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<td class="mdname1" valign="top" nowrap> </td>
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<td class="md" valign="top"> ) </td>
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<td class="md" nowrap> const<code> [inline]</code></td>
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</tr>
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<table cellspacing="5" cellpadding="0" border="0">
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<tr>
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<td>
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</td>
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<td>
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<p>
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Get the current phase of the signal.
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<p>
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Get the phase of the signal, in the range [0 to 1.0). </td>
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</tr>
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</table>
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<a class="anchor" name="a6"></a><!-- doxytag: member="Blit::setHarmonics" ref="a6" args="(unsigned int nHarmonics=0)" --><p>
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<table class="mdTable" cellpadding="2" cellspacing="0">
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<td class="mdRow">
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<table cellpadding="0" cellspacing="0" border="0">
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<td class="md" nowrap valign="top">void Blit::setHarmonics </td>
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<td class="md" valign="top">( </td>
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<td class="md" nowrap valign="top">unsigned int </td>
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<td class="mdname1" valign="top" nowrap> <em>nHarmonics</em> = <code>0</code> </td>
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<td class="md" valign="top"> ) </td>
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<td class="md" nowrap></td>
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</tr>
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</table>
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</td>
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<table cellspacing="5" cellpadding="0" border="0">
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<tr>
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<td>
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</td>
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<td>
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<p>
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Set the number of harmonics generated in the signal.
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<p>
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This function sets the number of harmonics contained in the resulting signal. It is equivalent to (2 * M) + 1 in the BLIT algorithm. The default value of 0 sets the algorithm for maximum harmonic content (harmonics up to half the sample rate). This parameter is not checked against the current sample rate and fundamental frequency. Thus, aliasing can result if one or more harmonics for a given fundamental frequency exceeds fs / 2. This behavior was chosen over the potentially more problematic solution of automatically modifying the M parameter, which can produce audible clicks in the signal. </td>
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</tr>
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</table>
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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="Blit_8h-source.html">Blit.h</a></ul>
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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>©1995-2007 Perry R. Cook and Gary P. Scavone. All Rights Reserved.</td></tr>
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</table>
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