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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="tutorial.html">Tutorial</a></CENTER>
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<!-- Generated by Doxygen 1.3.4 -->
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<h1>TwoZero Class Reference</h1><code>#include <<a class="el" href="TwoZero_8h-source.html">TwoZero.h</a>></code>
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<p>
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<p>Inheritance diagram for TwoZero:
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<p><center><img src="classTwoZero.png" usemap="#TwoZero_map" border="0" alt=""></center>
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<map name="TwoZero_map">
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<area href="classFilter.html" alt="Filter" shape="rect" coords="0,56,63,80">
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<area href="classStk.html" alt="Stk" shape="rect" coords="0,0,63,24">
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</map>
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<a href="classTwoZero-members.html">List of all members.</a><hr><a name="_details"></a><h2>Detailed Description</h2>
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STK two-zero filter class.
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<p>
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This protected <a class="el" href="classFilter.html">Filter</a> subclass implements a two-zero digital filter. A method is provided for creating a "notch" in the frequency response while maintaining a constant filter gain.<p>
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by Perry R. Cook and Gary P. Scavone, 1995 - 2004.
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<p>
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Definition at line <a class="el" href="TwoZero_8h-source.html#l00020">20</a> of file <a class="el" href="TwoZero_8h-source.html">TwoZero.h</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><a class="anchor" name="a0" doxytag="TwoZero::TwoZero" ></a>
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</td><td class="memItemRight" valign=bottom><a class="el" href="classTwoZero.html#a0">TwoZero</a> ()</td></tr>
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<tr><td class="mdescLeft"> </td><td class="mdescRight">Default constructor creates a second-order pass-through filter. <br><br></td></tr>
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<tr><td class="memItemLeft" nowrap align=right valign=top><a class="anchor" name="a1" doxytag="TwoZero::~TwoZero" ></a>
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</td><td class="memItemRight" valign=bottom><a class="el" href="classTwoZero.html#a1">~TwoZero</a> ()</td></tr>
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<tr><td class="mdescLeft"> </td><td class="mdescRight">Class destructor. <br><br></td></tr>
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<tr><td class="memItemLeft" nowrap align=right valign=top><a class="anchor" name="a2" doxytag="TwoZero::clear" ></a>
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void </td><td class="memItemRight" valign=bottom><a class="el" href="classTwoZero.html#a2">clear</a> (void)</td></tr>
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<tr><td class="mdescLeft"> </td><td class="mdescRight">Clears the internal states of the filter. <br><br></td></tr>
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<tr><td class="memItemLeft" nowrap align=right valign=top><a class="anchor" name="a3" doxytag="TwoZero::setB0" ></a>
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void </td><td class="memItemRight" valign=bottom><a class="el" href="classTwoZero.html#a3">setB0</a> (StkFloat b0)</td></tr>
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<tr><td class="mdescLeft"> </td><td class="mdescRight">Set the b[0] coefficient value. <br><br></td></tr>
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<tr><td class="memItemLeft" nowrap align=right valign=top><a class="anchor" name="a4" doxytag="TwoZero::setB1" ></a>
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void </td><td class="memItemRight" valign=bottom><a class="el" href="classTwoZero.html#a4">setB1</a> (StkFloat b1)</td></tr>
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<tr><td class="mdescLeft"> </td><td class="mdescRight">Set the b[1] coefficient value. <br><br></td></tr>
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<tr><td class="memItemLeft" nowrap align=right valign=top><a class="anchor" name="a5" doxytag="TwoZero::setB2" ></a>
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void </td><td class="memItemRight" valign=bottom><a class="el" href="classTwoZero.html#a5">setB2</a> (StkFloat b2)</td></tr>
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<tr><td class="mdescLeft"> </td><td class="mdescRight">Set the b[2] coefficient value. <br><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="classTwoZero.html#a6">setNotch</a> (StkFloat frequency, StkFloat radius)</td></tr>
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<tr><td class="mdescLeft"> </td><td class="mdescRight">Sets the filter coefficients for a "notch" at <em>frequency</em> (in Hz). </em> <a href="#a6"></a><em><br><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="classTwoZero.html#a7">setGain</a> (StkFloat gain)</td></tr>
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<tr><td class="mdescLeft"> </td><td class="mdescRight">Set the filter gain. </em> <a href="#a7"></a><em><br><br></td></tr>
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<tr><td class="memItemLeft" nowrap align=right valign=top><a class="anchor" name="a8" doxytag="TwoZero::getGain" ></a>
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StkFloat </td><td class="memItemRight" valign=bottom><a class="el" href="classTwoZero.html#a8">getGain</a> (void) const </td></tr>
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<tr><td class="mdescLeft"> </td><td class="mdescRight">Return the current filter gain. <br><br></td></tr>
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<tr><td class="memItemLeft" nowrap align=right valign=top><a class="anchor" name="a9" doxytag="TwoZero::lastOut" ></a>
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StkFloat </td><td class="memItemRight" valign=bottom><a class="el" href="classTwoZero.html#a9">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><br></td></tr>
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<tr><td class="memItemLeft" nowrap align=right valign=top><a class="anchor" name="a10" doxytag="TwoZero::tick" ></a>
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StkFloat </td><td class="memItemRight" valign=bottom><a class="el" href="classTwoZero.html#a10">tick</a> (StkFloat sample)</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><br></td></tr>
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<tr><td class="memItemLeft" nowrap align=right valign=top><a class="anchor" name="a11" doxytag="TwoZero::tick" ></a>
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StkFloat * </td><td class="memItemRight" valign=bottom><a class="el" href="classTwoZero.html#a11">tick</a> (StkFloat *vector, unsigned int vectorSize)</td></tr>
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<tr><td class="mdescLeft"> </td><td class="mdescRight">Input <em>vectorSize</em> samples to the filter and return an equal number of outputs in <em>vector</em>. <br><br></td></tr>
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<tr><td class="memItemLeft" nowrap align=right valign=top><a class="el" href="classStkFrames.html">StkFrames</a> & </td><td class="memItemRight" valign=bottom><a class="el" href="classTwoZero.html#a12">tick</a> (<a class="el" href="classStkFrames.html">StkFrames</a> &frames, unsigned int channel=1)</td></tr>
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<tr><td class="mdescLeft"> </td><td class="mdescRight">Take a channel of the <a class="el" href="classStkFrames.html">StkFrames</a> object as inputs to the filter and replace with corresponding outputs. </em> <a href="#a12"></a><em><br><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="a6" doxytag="TwoZero::setNotch" ></a><p>
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<table class="mdTable" width="100%" 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 TwoZero::setNotch </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="mdname" nowrap> <em>frequency</em>, </td>
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</tr>
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<tr>
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<td></td>
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<td></td>
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<td class="md" nowrap>StkFloat </td>
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<td class="mdname" nowrap> <em>radius</em></td>
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</tr>
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<tr>
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<td></td>
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<td class="md">) </td>
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<td class="md" colspan="2"></td>
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</tr>
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</table>
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</td>
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</tr>
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</table>
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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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Sets the filter coefficients for a "notch" at <em>frequency</em> (in Hz).
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<p>
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This method determines the filter coefficients corresponding to two complex-conjugate zeros with the given <em>frequency</em> (in Hz) and <em>radius</em> from the z-plane origin. The coefficients are then normalized to produce a maximum filter gain of one (independent of the filter <em>gain</em> parameter). The resulting filter frequency response has a "notch" or anti-resonance at the given <em>frequency</em>. The closer the zeros are to the unit-circle (<em>radius</em> close to or equal to one), the narrower the resulting notch width. </td>
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</tr>
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</table>
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<a class="anchor" name="a7" doxytag="TwoZero::setGain" ></a><p>
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<table class="mdTable" width="100%" 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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<tr>
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<td class="md" nowrap valign="top"> void TwoZero::setGain </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>gain</em> </td>
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<td class="md" valign="top"> ) </td>
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<td class="md" nowrap><code> [virtual]</code></td>
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</tr>
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</table>
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</td>
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</tr>
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</table>
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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 filter gain.
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<p>
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The gain is applied at the filter input and does not affect the coefficient values. The default gain value is 1.0.
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<p>
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Reimplemented from <a class="el" href="classFilter.html#a7">Filter</a>. </td>
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</tr>
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</table>
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<a class="anchor" name="a12" doxytag="TwoZero::tick" ></a><p>
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<table class="mdTable" width="100%" 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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<tr>
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<td class="md" nowrap valign="top"> <a class="el" href="classStkFrames.html">StkFrames</a>& TwoZero::tick </td>
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<td class="md" valign="top">( </td>
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<td class="md" nowrap valign="top"><a class="el" href="classStkFrames.html">StkFrames</a> & </td>
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<td class="mdname" nowrap> <em>frames</em>, </td>
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</tr>
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<tr>
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<td></td>
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<td></td>
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<td class="md" nowrap>unsigned int </td>
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<td class="mdname" nowrap> <em>channel</em> = 1</td>
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</tr>
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<tr>
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<td></td>
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<td class="md">) </td>
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<td class="md" colspan="2"><code> [virtual]</code></td>
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</tr>
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</table>
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</td>
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</tr>
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</table>
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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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<p>
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Take a channel of the <a class="el" href="classStkFrames.html">StkFrames</a> object as inputs to the filter and replace with corresponding outputs.
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<p>
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The <code>channel</code> argument should be one or greater (the first channel is specified by 1). An <a class="el" href="classStkError.html">StkError</a> will be thrown if the <code>channel</code> argument is zero or it is greater than the number of channels in the <a class="el" href="classStkFrames.html">StkFrames</a> object.
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<p>
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Reimplemented from <a class="el" href="classFilter.html#a12">Filter</a>. </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="TwoZero_8h-source.html">TwoZero.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>©1995-2004 Perry R. Cook and Gary P. Scavone. All Rights Reserved.</td></tr>
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</table>
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