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<HTML>
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<TITLE>The Synthesis ToolKit in C++ (STK)</TITLE>
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<!-- Generated by Doxygen 1.6.2 -->
<div class="navpath"><a class="el" href="namespacestk.html">stk</a>::<a class="el" href="classstk_1_1Iir.html">Iir</a>
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<div class="contents">
<h1>stk::Iir Class Reference</h1><!-- doxytag: class="stk::Iir" --><!-- doxytag: inherits="stk::Filter" -->
<p>STK general infinite impulse response filter class.
<a href="#_details">More...</a></p>
<p><code>#include <<a class="el" href="Iir_8h_source.html">Iir.h</a>></code></p>
<div class="dynheader">
Inheritance diagram for stk::Iir:</div>
<div class="dynsection">
<div class="center">
<img src="classstk_1_1Iir.png" usemap="#stk::Iir_map" alt=""/>
<map id="stk::Iir_map" name="stk::Iir_map">
<area href="classstk_1_1Filter.html" alt="stk::Filter" shape="rect" coords="0,56,62,80"/>
<area href="classstk_1_1Stk.html" alt="stk::Stk" shape="rect" coords="0,0,62,24"/>
</map>
</div>
</div>
<p><a href="classstk_1_1Iir-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"><a class="anchor" id="a1d63797b4caf775de8d351ec0c15a4c0"></a><!-- doxytag: member="stk::Iir::Iir" ref="a1d63797b4caf775de8d351ec0c15a4c0" args="(void)" -->
</td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1Iir.html#a1d63797b4caf775de8d351ec0c15a4c0">Iir</a> (void)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Default constructor creates a zero-order pass-through "filter". <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1Iir.html#ab011114d45e4f5b1222e07070c9bdc38">Iir</a> (std::vector< StkFloat > &bCoefficients, std::vector< StkFloat > &aCoefficients)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Overloaded constructor which takes filter coefficients. <a href="#ab011114d45e4f5b1222e07070c9bdc38"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="ac15361cbfa19e6e4f73a155abc1459a8"></a><!-- doxytag: member="stk::Iir::~Iir" ref="ac15361cbfa19e6e4f73a155abc1459a8" args="(void)" -->
</td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1Iir.html#ac15361cbfa19e6e4f73a155abc1459a8">~Iir</a> (void)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Class destructor. <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1Iir.html#aa0249b92dcec86ae83688debedb8d95b">setCoefficients</a> (std::vector< StkFloat > &bCoefficients, std::vector< StkFloat > &aCoefficients, bool clearState=false)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Set filter coefficients. <a href="#aa0249b92dcec86ae83688debedb8d95b"></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_1Iir.html#a7a1473446857a14cdbb33cb5afde076c">setNumerator</a> (std::vector< StkFloat > &bCoefficients, bool clearState=false)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Set numerator coefficients. <a href="#a7a1473446857a14cdbb33cb5afde076c"></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_1Iir.html#ae67cc04a452edfbd80f1a27097ea0187">setDenominator</a> (std::vector< StkFloat > &aCoefficients, bool clearState=false)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Set denominator coefficients. <a href="#ae67cc04a452edfbd80f1a27097ea0187"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a5dcae9330f2c52d2bfa1647e6b250a14"></a><!-- doxytag: member="stk::Iir::lastOut" ref="a5dcae9330f2c52d2bfa1647e6b250a14" args="(void) const " -->
StkFloat </td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1Iir.html#a5dcae9330f2c52d2bfa1647e6b250a14">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"><a class="anchor" id="a9b79bb8ba512052a4b90444c9d2d0d84"></a><!-- doxytag: member="stk::Iir::tick" ref="a9b79bb8ba512052a4b90444c9d2d0d84" args="(StkFloat input)" -->
StkFloat </td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1Iir.html#a9b79bb8ba512052a4b90444c9d2d0d84">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_1Iir.html#ad03f40e022b2adfe942d30908ec34793">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="#ad03f40e022b2adfe942d30908ec34793"></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_1Iir.html#a60919d8e000bf83613bdd5e002d750f1">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="#a60919d8e000bf83613bdd5e002d750f1"></a><br/></td></tr>
</table>
<hr/><a name="_details"></a><h2>Detailed Description</h2>
<p>STK general infinite impulse response filter class. </p>
<p>This class provides a generic digital filter structure that can be used to implement IIR filters. For filters containing only feedforward terms, the <a class="el" href="classstk_1_1Fir.html" title="STK general finite impulse response filter class.">Fir</a> class is slightly more efficient.</p>
<p>In particular, this class implements the standard difference equation:</p>
<p>a[0]*y[n] = b[0]*x[n] + ... + b[nb]*x[n-nb] - a[1]*y[n-1] - ... - a[na]*y[n-na]</p>
<p>If a[0] is not equal to 1, the filter coeffcients are normalized by a[0].</p>
<p>The <em>gain</em> parameter is applied at the filter input and does not affect the coefficient values. The default gain value is 1.0. This structure results in one extra multiply per computed sample, but allows easy control of the overall filter gain.</p>
<p>by Perry R. Cook and Gary P. Scavone, 1995-2012. </p>
<hr/><h2>Constructor & Destructor Documentation</h2>
<a class="anchor" id="ab011114d45e4f5b1222e07070c9bdc38"></a><!-- doxytag: member="stk::Iir::Iir" ref="ab011114d45e4f5b1222e07070c9bdc38" args="(std::vector< StkFloat > &bCoefficients, std::vector< StkFloat > &aCoefficients)" -->
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<td class="memname">stk::Iir::Iir </td>
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<td class="paramtype">std::vector< StkFloat > & </td>
<td class="paramname"> <em>bCoefficients</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">std::vector< StkFloat > & </td>
<td class="paramname"> <em>aCoefficients</em></td><td> </td>
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<td></td>
<td>)</td>
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<p>Overloaded constructor which takes filter coefficients. </p>
<p>An <a class="el" href="classstk_1_1StkError.html" title="STK error handling class.">StkError</a> can be thrown if either of the coefficient vector sizes is zero, or if the a[0] coefficient is equal to zero. </p>
</div>
</div>
<hr/><h2>Member Function Documentation</h2>
<a class="anchor" id="aa0249b92dcec86ae83688debedb8d95b"></a><!-- doxytag: member="stk::Iir::setCoefficients" ref="aa0249b92dcec86ae83688debedb8d95b" args="(std::vector< StkFloat > &bCoefficients, std::vector< StkFloat > &aCoefficients, bool clearState=false)" -->
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<td class="memname">void stk::Iir::setCoefficients </td>
<td>(</td>
<td class="paramtype">std::vector< StkFloat > & </td>
<td class="paramname"> <em>bCoefficients</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">std::vector< StkFloat > & </td>
<td class="paramname"> <em>aCoefficients</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">bool </td>
<td class="paramname"> <em>clearState</em> = <code>false</code></td><td> </td>
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<td></td>
<td>)</td>
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<p>Set filter coefficients. </p>
<p>An <a class="el" href="classstk_1_1StkError.html" title="STK error handling class.">StkError</a> can be thrown if either of the coefficient vector sizes is zero, or if the a[0] coefficient is equal to zero. If a[0] is not equal to 1, the filter coeffcients are normalized by a[0]. The internal state of the filter is not cleared unless the <em>clearState</em> flag is <code>true</code>. </p>
</div>
</div>
<a class="anchor" id="a7a1473446857a14cdbb33cb5afde076c"></a><!-- doxytag: member="stk::Iir::setNumerator" ref="a7a1473446857a14cdbb33cb5afde076c" args="(std::vector< StkFloat > &bCoefficients, bool clearState=false)" -->
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<td class="memname">void stk::Iir::setNumerator </td>
<td>(</td>
<td class="paramtype">std::vector< StkFloat > & </td>
<td class="paramname"> <em>bCoefficients</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">bool </td>
<td class="paramname"> <em>clearState</em> = <code>false</code></td><td> </td>
</tr>
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<td></td>
<td>)</td>
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<p>Set numerator coefficients. </p>
<p>An <a class="el" href="classstk_1_1StkError.html" title="STK error handling class.">StkError</a> can be thrown if coefficient vector is empty. Any previously set denominator coefficients are left unaffected. Note that the default constructor sets the single denominator coefficient a[0] to 1.0. The internal state of the filter is not cleared unless the <em>clearState</em> flag is <code>true</code>. </p>
</div>
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<a class="anchor" id="ae67cc04a452edfbd80f1a27097ea0187"></a><!-- doxytag: member="stk::Iir::setDenominator" ref="ae67cc04a452edfbd80f1a27097ea0187" args="(std::vector< StkFloat > &aCoefficients, bool clearState=false)" -->
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<td class="memname">void stk::Iir::setDenominator </td>
<td>(</td>
<td class="paramtype">std::vector< StkFloat > & </td>
<td class="paramname"> <em>aCoefficients</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">bool </td>
<td class="paramname"> <em>clearState</em> = <code>false</code></td><td> </td>
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<td></td>
<td>)</td>
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<div class="memdoc">
<p>Set denominator coefficients. </p>
<p>An <a class="el" href="classstk_1_1StkError.html" title="STK error handling class.">StkError</a> can be thrown if the coefficient vector is empty or if the a[0] coefficient is equal to zero. Previously set numerator coefficients are unaffected unless a[0] is not equal to 1, in which case all coeffcients are normalized by a[0]. Note that the default constructor sets the single numerator coefficient b[0] to 1.0. The internal state of the filter is not cleared unless the <em>clearState</em> flag is <code>true</code>. </p>
</div>
</div>
<a class="anchor" id="ad03f40e022b2adfe942d30908ec34793"></a><!-- doxytag: member="stk::Iir::tick" ref="ad03f40e022b2adfe942d30908ec34793" 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::Iir::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>
</tr>
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<td class="paramkey"></td>
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<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="l00136"></a>00136 {
<a name="l00137"></a>00137 <span class="preprocessor">#if defined(_STK_DEBUG_)</span>
<a name="l00138"></a>00138 <span class="preprocessor"></span> <span class="keywordflow">if</span> ( channel >= frames.channels() ) {
<a name="l00139"></a>00139 oStream_ << <span class="stringliteral">"Iir::tick(): channel and StkFrames arguments are incompatible!"</span>;
<a name="l00140"></a>00140 <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="l00141"></a>00141 }
<a name="l00142"></a>00142 <span class="preprocessor">#endif</span>
<a name="l00143"></a>00143 <span class="preprocessor"></span>
<a name="l00144"></a>00144 StkFloat *samples = &frames[channel];
<a name="l00145"></a>00145 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i, hop = frames.channels();
<a name="l00146"></a>00146 <span class="keywordflow">for</span> ( <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> j=0; j<frames.frames(); j++, samples += hop ) {
<a name="l00147"></a>00147 outputs_[0] = 0.0;
<a name="l00148"></a>00148 inputs_[0] = gain_ * *samples;
<a name="l00149"></a>00149 <span class="keywordflow">for</span> ( i=b_.size()-1; i>0; i-- ) {
<a name="l00150"></a>00150 outputs_[0] += b_[i] * inputs_[i];
<a name="l00151"></a>00151 inputs_[i] = inputs_[i-1];
<a name="l00152"></a>00152 }
<a name="l00153"></a>00153 outputs_[0] += b_[0] * inputs_[0];
<a name="l00154"></a>00154
<a name="l00155"></a>00155 <span class="keywordflow">for</span> ( i=a_.size()-1; i>0; i-- ) {
<a name="l00156"></a>00156 outputs_[0] += -a_[i] * outputs_[i];
<a name="l00157"></a>00157 outputs_[i] = outputs_[i-1];
<a name="l00158"></a>00158 }
<a name="l00159"></a>00159
<a name="l00160"></a>00160 *samples = outputs_[0];
<a name="l00161"></a>00161 }
<a name="l00162"></a>00162
<a name="l00163"></a>00163 lastFrame_[0] = *(samples-hop);
<a name="l00164"></a>00164 <span class="keywordflow">return</span> frames;
<a name="l00165"></a>00165 }
</pre></div></p>
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<a class="anchor" id="a60919d8e000bf83613bdd5e002d750f1"></a><!-- doxytag: member="stk::Iir::tick" ref="a60919d8e000bf83613bdd5e002d750f1" 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::Iir::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>
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<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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<td class="paramtype">unsigned int </td>
<td class="paramname"> <em>iChannel</em> = <code>0</code>, </td>
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<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="l00168"></a>00168 {
<a name="l00169"></a>00169 <span class="preprocessor">#if defined(_STK_DEBUG_)</span>
<a name="l00170"></a>00170 <span class="preprocessor"></span> <span class="keywordflow">if</span> ( iChannel >= iFrames.channels() || oChannel >= oFrames.channels() ) {
<a name="l00171"></a>00171 oStream_ << <span class="stringliteral">"Iir::tick(): channel and StkFrames arguments are incompatible!"</span>;
<a name="l00172"></a>00172 <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="l00173"></a>00173 }
<a name="l00174"></a>00174 <span class="preprocessor">#endif</span>
<a name="l00175"></a>00175 <span class="preprocessor"></span>
<a name="l00176"></a>00176 StkFloat *iSamples = &iFrames[iChannel];
<a name="l00177"></a>00177 StkFloat *oSamples = &oFrames[oChannel];
<a name="l00178"></a>00178 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i, iHop = iFrames.channels(), oHop = oFrames.channels();
<a name="l00179"></a>00179 <span class="keywordflow">for</span> ( <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> j=0; j<iFrames.frames(); j++, iSamples += iHop, oSamples += oHop ) {
<a name="l00180"></a>00180 outputs_[0] = 0.0;
<a name="l00181"></a>00181 inputs_[0] = gain_ * *iSamples;
<a name="l00182"></a>00182 <span class="keywordflow">for</span> ( i=b_.size()-1; i>0; i-- ) {
<a name="l00183"></a>00183 outputs_[0] += b_[i] * inputs_[i];
<a name="l00184"></a>00184 inputs_[i] = inputs_[i-1];
<a name="l00185"></a>00185 }
<a name="l00186"></a>00186 outputs_[0] += b_[0] * inputs_[0];
<a name="l00187"></a>00187
<a name="l00188"></a>00188 <span class="keywordflow">for</span> ( i=a_.size()-1; i>0; i-- ) {
<a name="l00189"></a>00189 outputs_[0] += -a_[i] * outputs_[i];
<a name="l00190"></a>00190 outputs_[i] = outputs_[i-1];
<a name="l00191"></a>00191 }
<a name="l00192"></a>00192
<a name="l00193"></a>00193 *oSamples = outputs_[0];
<a name="l00194"></a>00194 }
<a name="l00195"></a>00195
<a name="l00196"></a>00196 lastFrame_[0] = *(oSamples-oHop);
<a name="l00197"></a>00197 <span class="keywordflow">return</span> iFrames;
<a name="l00198"></a>00198 }
</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="Iir_8h_source.html">Iir.h</a></li>
</ul>
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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>
<tr><td>©1995-2012 Perry R. Cook and Gary P. Scavone. All Rights Reserved.</td></tr>
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