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<HTML>
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<TITLE>The Synthesis ToolKit in C++ (STK)</TITLE>
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<div class="navpath"><a class="el" href="namespacestk.html">stk</a>::<a class="el" href="classstk_1_1OneZero.html">OneZero</a>
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<h1>stk::OneZero Class Reference</h1><!-- doxytag: class="stk::OneZero" --><!-- doxytag: inherits="stk::Filter" -->
<p>STK one-zero filter class.
<a href="#_details">More...</a></p>
<p><code>#include <<a class="el" href="OneZero_8h_source.html">OneZero.h</a>></code></p>
<div class="dynheader">
Inheritance diagram for stk::OneZero:</div>
<div class="dynsection">
<div class="center">
<img src="classstk_1_1OneZero.png" usemap="#stk::OneZero_map" alt=""/>
<map id="stk::OneZero_map" name="stk::OneZero_map">
<area href="classstk_1_1Filter.html" alt="stk::Filter" shape="rect" coords="0,56,85,80"/>
<area href="classstk_1_1Stk.html" alt="stk::Stk" shape="rect" coords="0,0,85,24"/>
</map>
</div>
</div>
<p><a href="classstk_1_1OneZero-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="ada639198d28be5d170508a301ba854da"></a><!-- doxytag: member="stk::OneZero::OneZero" ref="ada639198d28be5d170508a301ba854da" args="(StkFloat theZero=-1.0)" -->
</td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1OneZero.html#ada639198d28be5d170508a301ba854da">OneZero</a> (StkFloat theZero=-1.0)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">The default constructor creates a low-pass filter (zero at z = -1.0). <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a8abe6156bad57d3a5cfebcf2ddc9b703"></a><!-- doxytag: member="stk::OneZero::~OneZero" ref="a8abe6156bad57d3a5cfebcf2ddc9b703" args="()" -->
</td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1OneZero.html#a8abe6156bad57d3a5cfebcf2ddc9b703">~OneZero</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Class destructor. <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="aef2a8aa1759762649a74fc031198ebca"></a><!-- doxytag: member="stk::OneZero::setB0" ref="aef2a8aa1759762649a74fc031198ebca" args="(StkFloat b0)" -->
void </td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1OneZero.html#aef2a8aa1759762649a74fc031198ebca">setB0</a> (StkFloat b0)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Set the b[0] coefficient value. <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="ad4eda332f920e43a33871c8beb6f3042"></a><!-- doxytag: member="stk::OneZero::setB1" ref="ad4eda332f920e43a33871c8beb6f3042" args="(StkFloat b1)" -->
void </td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1OneZero.html#ad4eda332f920e43a33871c8beb6f3042">setB1</a> (StkFloat b1)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Set the b[1] coefficient value. <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a6113bf1dce0cb23719e30ee29e7c6735"></a><!-- doxytag: member="stk::OneZero::setCoefficients" ref="a6113bf1dce0cb23719e30ee29e7c6735" args="(StkFloat b0, StkFloat b1, bool clearState=false)" -->
void </td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1OneZero.html#a6113bf1dce0cb23719e30ee29e7c6735">setCoefficients</a> (StkFloat b0, StkFloat b1, bool clearState=false)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Set all filter coefficients. <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1OneZero.html#af8301fdb6a893ec6eb74fbcbeeaa463c">setZero</a> (StkFloat theZero)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Set the zero position in the z-plane. <a href="#af8301fdb6a893ec6eb74fbcbeeaa463c"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a54e160f62354939876477d9c5a65890c"></a><!-- doxytag: member="stk::OneZero::lastOut" ref="a54e160f62354939876477d9c5a65890c" args="(void) const " -->
StkFloat </td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1OneZero.html#a54e160f62354939876477d9c5a65890c">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="a9f52fa395257b15cb7351c6ccb2199da"></a><!-- doxytag: member="stk::OneZero::tick" ref="a9f52fa395257b15cb7351c6ccb2199da" args="(StkFloat input)" -->
StkFloat </td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1OneZero.html#a9f52fa395257b15cb7351c6ccb2199da">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_1OneZero.html#a2ca42a158bed919d8578c4a2dd184b3d">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="#a2ca42a158bed919d8578c4a2dd184b3d"></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_1OneZero.html#a8568a0d8c4aacc64b656b9fe46f217a4">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="#a8568a0d8c4aacc64b656b9fe46f217a4"></a><br/></td></tr>
</table>
<hr/><a name="_details"></a><h2>Detailed Description</h2>
<p>STK one-zero filter class. </p>
<p>This class implements a one-zero digital filter. A method is provided for setting the zero position along the real axis of the z-plane while maintaining a constant filter gain.</p>
<p>by Perry R. Cook and Gary P. Scavone, 1995-2012. </p>
<hr/><h2>Member Function Documentation</h2>
<a class="anchor" id="af8301fdb6a893ec6eb74fbcbeeaa463c"></a><!-- doxytag: member="stk::OneZero::setZero" ref="af8301fdb6a893ec6eb74fbcbeeaa463c" args="(StkFloat theZero)" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
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<td class="memname">void stk::OneZero::setZero </td>
<td>(</td>
<td class="paramtype">StkFloat </td>
<td class="paramname"> <em>theZero</em></td>
<td> ) </td>
<td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Set the zero position in the z-plane. </p>
<p>This method sets the zero position along the real-axis of the z-plane and normalizes the coefficients for a maximum gain of one. A positive zero value produces a high-pass filter, while a negative zero value produces a low-pass filter. This method does not affect the filter <em>gain</em> value. </p>
</div>
</div>
<a class="anchor" id="a2ca42a158bed919d8578c4a2dd184b3d"></a><!-- doxytag: member="stk::OneZero::tick" ref="a2ca42a158bed919d8578c4a2dd184b3d" args="(StkFrames &frames, unsigned int channel=0)" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname"><a class="el" href="classstk_1_1StkFrames.html">StkFrames</a> & stk::OneZero::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>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">unsigned int </td>
<td class="paramname"> <em>channel</em> = <code>0</code></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td><code> [inline, virtual]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<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="l00089"></a>00089 {
<a name="l00090"></a>00090 <span class="preprocessor">#if defined(_STK_DEBUG_)</span>
<a name="l00091"></a>00091 <span class="preprocessor"></span> <span class="keywordflow">if</span> ( channel >= frames.channels() ) {
<a name="l00092"></a>00092 oStream_ << <span class="stringliteral">"OneZero::tick(): channel and StkFrames arguments are incompatible!"</span>;
<a name="l00093"></a>00093 <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="l00094"></a>00094 }
<a name="l00095"></a>00095 <span class="preprocessor">#endif</span>
<a name="l00096"></a>00096 <span class="preprocessor"></span>
<a name="l00097"></a>00097 StkFloat *samples = &frames[channel];
<a name="l00098"></a>00098 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> hop = frames.channels();
<a name="l00099"></a>00099 <span class="keywordflow">for</span> ( <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i=0; i<frames.frames(); i++, samples += hop ) {
<a name="l00100"></a>00100 inputs_[0] = gain_ * *samples;
<a name="l00101"></a>00101 *samples = b_[1] * inputs_[1] + b_[0] * inputs_[0];
<a name="l00102"></a>00102 inputs_[1] = inputs_[0];
<a name="l00103"></a>00103 }
<a name="l00104"></a>00104
<a name="l00105"></a>00105 lastFrame_[0] = *(samples-hop);
<a name="l00106"></a>00106 <span class="keywordflow">return</span> frames;
<a name="l00107"></a>00107 }
</pre></div></p>
</div>
</div>
<a class="anchor" id="a8568a0d8c4aacc64b656b9fe46f217a4"></a><!-- doxytag: member="stk::OneZero::tick" ref="a8568a0d8c4aacc64b656b9fe46f217a4" args="(StkFrames &iFrames, StkFrames &oFrames, unsigned int iChannel=0, unsigned int oChannel=0)" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname"><a class="el" href="classstk_1_1StkFrames.html">StkFrames</a> & stk::OneZero::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>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="classstk_1_1StkFrames.html">StkFrames</a> & </td>
<td class="paramname"> <em>oFrames</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">unsigned int </td>
<td class="paramname"> <em>iChannel</em> = <code>0</code>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">unsigned int </td>
<td class="paramname"> <em>oChannel</em> = <code>0</code></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td><code> [inline]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<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="l00110"></a>00110 {
<a name="l00111"></a>00111 <span class="preprocessor">#if defined(_STK_DEBUG_)</span>
<a name="l00112"></a>00112 <span class="preprocessor"></span> <span class="keywordflow">if</span> ( iChannel >= iFrames.channels() || oChannel >= oFrames.channels() ) {
<a name="l00113"></a>00113 oStream_ << <span class="stringliteral">"OneZero::tick(): channel and StkFrames arguments are incompatible!"</span>;
<a name="l00114"></a>00114 <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="l00115"></a>00115 }
<a name="l00116"></a>00116 <span class="preprocessor">#endif</span>
<a name="l00117"></a>00117 <span class="preprocessor"></span>
<a name="l00118"></a>00118 StkFloat *iSamples = &iFrames[iChannel];
<a name="l00119"></a>00119 StkFloat *oSamples = &oFrames[oChannel];
<a name="l00120"></a>00120 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> iHop = iFrames.channels(), oHop = oFrames.channels();
<a name="l00121"></a>00121 <span class="keywordflow">for</span> ( <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i=0; i<iFrames.frames(); i++, iSamples += iHop, oSamples += oHop ) {
<a name="l00122"></a>00122 inputs_[0] = gain_ * *iSamples;
<a name="l00123"></a>00123 *oSamples = b_[1] * inputs_[1] + b_[0] * inputs_[0];
<a name="l00124"></a>00124 inputs_[1] = inputs_[0];
<a name="l00125"></a>00125 }
<a name="l00126"></a>00126
<a name="l00127"></a>00127 lastFrame_[0] = *(oSamples-oHop);
<a name="l00128"></a>00128 <span class="keywordflow">return</span> iFrames;
<a name="l00129"></a>00129 }
</pre></div></p>
</div>
</div>
<hr/>The documentation for this class was generated from the following file:<ul>
<li><a class="el" href="OneZero_8h_source.html">OneZero.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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