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<h1>FormSwep Class Reference</h1>STK sweepable formant filter class.
<a href="#_details">More...</a>
<p>
<code>#include &lt;<a class="el" href="FormSwep_8h-source.html">FormSwep.h</a>&gt;</code>
<p>
<p>Inheritance diagram for FormSwep::
<p><center><img src="classFormSwep.gif" usemap="#FormSwep_map" border="0"></center>
<map name="FormSwep_map">
<area href="classBiQuad.html" alt="BiQuad" shape="rect" coords="0,112,72,136">
<area href="classFilter.html" alt="Filter" shape="rect" coords="0,56,72,80">
<area href="classStk.html" alt="Stk" shape="rect" coords="0,0,72,24">
</map>
<a href="classFormSwep-members.html">List of all members.</a><table border=0 cellpadding=0 cellspacing=0>
<tr><td colspan=2><br><h2>Public Methods</h2></td></tr>
<tr><td nowrap align=right valign=top><a name="a0" doxytag="FormSwep::FormSwep"></a>
&nbsp;</td><td valign=bottom><a class="el" href="classFormSwep.html#a0">FormSwep</a> ()</td></tr>
<tr><td>&nbsp;</td><td><font size=-1><em>Default constructor creates a second-order pass-through filter.</em></font><br><br></td></tr>
<tr><td nowrap align=right valign=top><a name="a1" doxytag="FormSwep::~FormSwep"></a>
&nbsp;</td><td valign=bottom><a class="el" href="classFormSwep.html#a1">~FormSwep</a> ()</td></tr>
<tr><td>&nbsp;</td><td><font size=-1><em>Class destructor.</em></font><br><br></td></tr>
<tr><td nowrap align=right valign=top>void&nbsp;</td><td valign=bottom><a class="el" href="classFormSwep.html#a2">setResonance</a> (MY_FLOAT aFrequency, MY_FLOAT aRadius)</td></tr>
<tr><td>&nbsp;</td><td><font size=-1><em>Sets the filter coefficients for a resonance at <em>frequency</em> (in Hz).</em> <a href="#a2">More...</a><em></em></font><br><br></td></tr>
<tr><td nowrap align=right valign=top><a name="a3" doxytag="FormSwep::setStates"></a>
void&nbsp;</td><td valign=bottom><a class="el" href="classFormSwep.html#a3">setStates</a> (MY_FLOAT aFrequency, MY_FLOAT aRadius, MY_FLOAT aGain=1.0)</td></tr>
<tr><td>&nbsp;</td><td><font size=-1><em>Set both the current and target resonance parameters.</em></font><br><br></td></tr>
<tr><td nowrap align=right valign=top><a name="a4" doxytag="FormSwep::setTargets"></a>
void&nbsp;</td><td valign=bottom><a class="el" href="classFormSwep.html#a4">setTargets</a> (MY_FLOAT aFrequency, MY_FLOAT aRadius, MY_FLOAT aGain=1.0)</td></tr>
<tr><td>&nbsp;</td><td><font size=-1><em>Set target resonance parameters.</em></font><br><br></td></tr>
<tr><td nowrap align=right valign=top>void&nbsp;</td><td valign=bottom><a class="el" href="classFormSwep.html#a5">setSweepRate</a> (MY_FLOAT aRate)</td></tr>
<tr><td>&nbsp;</td><td><font size=-1><em>Set the sweep rate (between 0.0 - 1.0).</em> <a href="#a5">More...</a><em></em></font><br><br></td></tr>
<tr><td nowrap align=right valign=top>void&nbsp;</td><td valign=bottom><a class="el" href="classFormSwep.html#a6">setSweepTime</a> (MY_FLOAT aTime)</td></tr>
<tr><td>&nbsp;</td><td><font size=-1><em>Set the sweep rate in terms of a time value in seconds.</em> <a href="#a6">More...</a><em></em></font><br><br></td></tr>
<tr><td nowrap align=right valign=top><a name="a7" doxytag="FormSwep::tick"></a>
MY_FLOAT&nbsp;</td><td valign=bottom><a class="el" href="classFormSwep.html#a7">tick</a> (MY_FLOAT sample)</td></tr>
<tr><td>&nbsp;</td><td><font size=-1><em>Input one sample to the filter and return one output.</em></font><br><br></td></tr>
<tr><td nowrap align=right valign=top><a name="a8" doxytag="FormSwep::tick"></a>
MY_FLOAT*&nbsp;</td><td valign=bottom><a class="el" href="classFormSwep.html#a8">tick</a> (MY_FLOAT *vector, unsigned int vectorSize)</td></tr>
<tr><td>&nbsp;</td><td><font size=-1><em>Input <em>vectorSize</em> samples to the filter and return an equal number of outputs in <em>vector</em>.</em></font><br><br></td></tr>
</table>
<hr><a name="_details"></a><h2>Detailed Description</h2>
STK sweepable formant filter class.
<p>
This public <a class="el" href="classBiQuad.html">BiQuad</a> filter subclass implements a formant (resonance) which can be "swept" over time from one frequency setting to another. It provides methods for controlling the sweep rate and target frequency.
<p>
by Perry R. Cook and Gary P. Scavone, 1995 - 2002.
<p>
<hr><h2>Member Function Documentation</h2>
<a name="a2" doxytag="FormSwep::setResonance"></a><p>
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void FormSwep::setResonance (
</b></td>
<td valign="bottom"><b>
MY_FLOAT <em>aFrequency</em>,
</b></td>
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<td></td>
<td><b>
MY_FLOAT <em>aRadius</em>&nbsp;)
</b></td>
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</td>
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&nbsp;
</td>
<td>
<p>
Sets the filter coefficients for a resonance at <em>frequency</em> (in Hz).
<p>
This method determines the filter coefficients corresponding to two complex-conjugate poles with the given <em>frequency</em> (in Hz) and <em>radius</em> from the z-plane origin. The filter zeros are placed at z = 1, z = -1, and the coefficients are then normalized to produce a constant unity gain (independent of the filter <em>gain</em> parameter). The resulting filter frequency response has a resonance at the given <em>frequency</em>. The closer the poles are to the unit-circle (<em>radius</em> close to one), the narrower the resulting resonance width. </td>
</tr>
</table>
<a name="a5" doxytag="FormSwep::setSweepRate"></a><p>
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void FormSwep::setSweepRate (
</b></td>
<td valign="bottom"><b>
MY_FLOAT <em>aRate</em>&nbsp;)
</b></td>
</tr>
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</td>
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&nbsp;
</td>
<td>
<p>
Set the sweep rate (between 0.0 - 1.0).
<p>
The formant parameters are varied in increments of the sweep rate between their current and target values. A sweep rate of 1.0 will produce an immediate change in resonance parameters from their current values to the target values. A sweep rate of 0.0 will produce no change in resonance parameters. </td>
</tr>
</table>
<a name="a6" doxytag="FormSwep::setSweepTime"></a><p>
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void FormSwep::setSweepTime (
</b></td>
<td valign="bottom"><b>
MY_FLOAT <em>aTime</em>&nbsp;)
</b></td>
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</table>
</td>
</tr>
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<td>
&nbsp;
</td>
<td>
<p>
Set the sweep rate in terms of a time value in seconds.
<p>
This method adjusts the sweep rate based on a given time for the formant parameters to reach their target values. </td>
</tr>
</table>
<hr>The documentation for this class was generated from the following file:<ul>
<li><a class="el" href="FormSwep_8h-source.html">FormSwep.h</a></ul>
<HR>
<table>
<tr><td><A HREF="http://www-ccrma.stanford.edu/software/stk/"><I>The Synthesis ToolKit in C++ (STK)</I></A></td></tr>
<tr><td>&copy;1995-2002 Perry R. Cook and Gary P. Scavone. All Rights Reserved.</td></tr>
</table>
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