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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_1LentPitShift.html">LentPitShift</a>
</div>
<div class="contents">
<h1>stk::LentPitShift Class Reference</h1><!-- doxytag: class="stk::LentPitShift" --><!-- doxytag: inherits="stk::Effect" -->
<p>Pitch shifter effect class based on the Lent algorithm.
<a href="#_details">More...</a></p>
<p><code>#include <<a class="el" href="LentPitShift_8h_source.html">LentPitShift.h</a>></code></p>
<div class="dynheader">
Inheritance diagram for stk::LentPitShift:</div>
<div class="dynsection">
<div class="center">
<img src="classstk_1_1LentPitShift.png" usemap="#stk::LentPitShift_map" alt=""/>
<map id="stk::LentPitShift_map" name="stk::LentPitShift_map">
<area href="classstk_1_1Effect.html" alt="stk::Effect" shape="rect" coords="0,56,96,80"/>
<area href="classstk_1_1Stk.html" alt="stk::Stk" shape="rect" coords="0,0,96,24"/>
</map>
</div>
</div>
<p><a href="classstk_1_1LentPitShift-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="a0eb0c1ba3d8fdb6eaabb1c96c58ed536"></a><!-- doxytag: member="stk::LentPitShift::LentPitShift" ref="a0eb0c1ba3d8fdb6eaabb1c96c58ed536" args="(StkFloat periodRatio=1.0, int tMax=RT_BUFFER_SIZE)" -->
</td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1LentPitShift.html#a0eb0c1ba3d8fdb6eaabb1c96c58ed536">LentPitShift</a> (StkFloat periodRatio=1.0, int tMax=RT_BUFFER_SIZE)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Class constructor. <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a5661bf4cd0a4b5b2bf9e4e81603c74be"></a><!-- doxytag: member="stk::LentPitShift::clear" ref="a5661bf4cd0a4b5b2bf9e4e81603c74be" args="(void)" -->
void </td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1LentPitShift.html#a5661bf4cd0a4b5b2bf9e4e81603c74be">clear</a> (void)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Reset and clear all internal state. <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a5dfe0a19b2ac3db599c808f4d676c076"></a><!-- doxytag: member="stk::LentPitShift::setShift" ref="a5dfe0a19b2ac3db599c808f4d676c076" args="(StkFloat shift)" -->
void </td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1LentPitShift.html#a5dfe0a19b2ac3db599c808f4d676c076">setShift</a> (StkFloat shift)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Set the pitch shift factor (1.0 produces no shift). <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a2bbc39e8e78dc672a0be451ec1fd6b7d"></a><!-- doxytag: member="stk::LentPitShift::tick" ref="a2bbc39e8e78dc672a0be451ec1fd6b7d" args="(StkFloat input)" -->
StkFloat </td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1LentPitShift.html#a2bbc39e8e78dc672a0be451ec1fd6b7d">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_1LentPitShift.html#a158cb313f45bbae6ee327cbc539abdd1">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="#a158cb313f45bbae6ee327cbc539abdd1"></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_1LentPitShift.html#af93de733eedca65de40597bd4a1f7b2a">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="#af93de733eedca65de40597bd4a1f7b2a"></a><br/></td></tr>
<tr><td colspan="2"><h2>Protected Member Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1LentPitShift.html#a5af0a9e3902ca6fc7c5d77d861d74445">process</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Apply the effect on the input samples and store it. <a href="#a5af0a9e3902ca6fc7c5d77d861d74445"></a><br/></td></tr>
</table>
<hr/><a name="_details"></a><h2>Detailed Description</h2>
<p>Pitch shifter effect class based on the Lent algorithm. </p>
<p>This class implements a pitch shifter using pitch tracking and sample windowing and shifting.</p>
<p>by Francois Germain, 2009. </p>
<hr/><h2>Member Function Documentation</h2>
<a class="anchor" id="a158cb313f45bbae6ee327cbc539abdd1"></a><!-- doxytag: member="stk::LentPitShift::tick" ref="a158cb313f45bbae6ee327cbc539abdd1" 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::LentPitShift::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]</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><div class="fragment"><pre class="fragment"><a name="l00224"></a>00224 {
<a name="l00225"></a>00225 <span class="preprocessor">#if defined(_STK_DEBUG_)</span>
<a name="l00226"></a>00226 <span class="preprocessor"></span> <span class="keywordflow">if</span> ( channel >= frames.channels() ) {
<a name="l00227"></a>00227 oStream_ << <span class="stringliteral">"LentPitShift::tick(): channel and StkFrames arguments are incompatible!"</span>;
<a name="l00228"></a>00228 <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="l00229"></a>00229 }
<a name="l00230"></a>00230 <span class="preprocessor">#endif</span>
<a name="l00231"></a>00231 <span class="preprocessor"></span>
<a name="l00232"></a>00232 StkFloat *samples = &frames[channel];
<a name="l00233"></a>00233 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> hop = frames.channels();
<a name="l00234"></a>00234 <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="l00235"></a>00235 *samples = <a class="code" href="classstk_1_1LentPitShift.html#a2bbc39e8e78dc672a0be451ec1fd6b7d" title="Input one sample to the filter and return one output.">tick</a>( *samples );
<a name="l00236"></a>00236 }
<a name="l00237"></a>00237
<a name="l00238"></a>00238 <span class="keywordflow">return</span> frames;
<a name="l00239"></a>00239 }
</pre></div></p>
</div>
</div>
<a class="anchor" id="af93de733eedca65de40597bd4a1f7b2a"></a><!-- doxytag: member="stk::LentPitShift::tick" ref="af93de733eedca65de40597bd4a1f7b2a" 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::LentPitShift::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="l00242"></a>00242 {
<a name="l00243"></a>00243 <span class="preprocessor">#if defined(_STK_DEBUG_)</span>
<a name="l00244"></a>00244 <span class="preprocessor"></span> <span class="keywordflow">if</span> ( iChannel >= iFrames.channels() || oChannel >= oFrames.channels() ) {
<a name="l00245"></a>00245 oStream_ << <span class="stringliteral">"LentPitShift::tick(): channel and StkFrames arguments are incompatible!"</span>;
<a name="l00246"></a>00246 <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="l00247"></a>00247 }
<a name="l00248"></a>00248 <span class="preprocessor">#endif</span>
<a name="l00249"></a>00249 <span class="preprocessor"></span>
<a name="l00250"></a>00250 StkFloat *iSamples = &iFrames[iChannel];
<a name="l00251"></a>00251 StkFloat *oSamples = &oFrames[oChannel];
<a name="l00252"></a>00252 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> iHop = iFrames.channels(), oHop = oFrames.channels();
<a name="l00253"></a>00253 <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="l00254"></a>00254 *oSamples = <a class="code" href="classstk_1_1LentPitShift.html#a2bbc39e8e78dc672a0be451ec1fd6b7d" title="Input one sample to the filter and return one output.">tick</a>( *iSamples );
<a name="l00255"></a>00255 }
<a name="l00256"></a>00256
<a name="l00257"></a>00257 <span class="keywordflow">return</span> iFrames;
<a name="l00258"></a>00258 }
</pre></div></p>
</div>
</div>
<a class="anchor" id="a5af0a9e3902ca6fc7c5d77d861d74445"></a><!-- doxytag: member="stk::LentPitShift::process" ref="a5af0a9e3902ca6fc7c5d77d861d74445" args="()" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">void stk::LentPitShift::process </td>
<td>(</td>
<td class="paramname"></td>
<td> ) </td>
<td><code> [inline, protected]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Apply the effect on the input samples and store it. </p>
<p>The samples stored in the input frame vector are processed and the delayed result are stored in the output frame vector. </p>
<p><div class="fragment"><pre class="fragment"><a name="l00110"></a>00110 {
<a name="l00111"></a>00111 StkFloat x_t; <span class="comment">// input coefficient</span>
<a name="l00112"></a>00112 StkFloat x_t_T; <span class="comment">// previous input coefficient at T samples</span>
<a name="l00113"></a>00113 StkFloat coeff; <span class="comment">// new coefficient for the difference function</span>
<a name="l00114"></a>00114
<a name="l00115"></a>00115 <span class="keywordtype">int</span> alternativePitch = tMax_; <span class="comment">// Global minimum storage</span>
<a name="l00116"></a>00116 lastPeriod_ = tMax_+1; <span class="comment">// Storage of the lowest local minimum under the threshold</span>
<a name="l00117"></a>00117
<a name="l00118"></a>00118 <span class="comment">// Loop variables</span>
<a name="l00119"></a>00119 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> delay_;
<a name="l00120"></a>00120 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> n;
<a name="l00121"></a>00121
<a name="l00122"></a>00122 <span class="comment">// Initialization of the dt coefficients. Since the</span>
<a name="l00123"></a>00123 <span class="comment">// frames are of tMax_ length, there is no overlapping</span>
<a name="l00124"></a>00124 <span class="comment">// between the successive windows where pitch tracking</span>
<a name="l00125"></a>00125 <span class="comment">// is performed.</span>
<a name="l00126"></a>00126 <span class="keywordflow">for</span> ( delay_=1; delay_<=tMax_; delay_++ )
<a name="l00127"></a>00127 dt[delay_] = 0.;
<a name="l00128"></a>00128
<a name="l00129"></a>00129 <span class="comment">// Calculation of the dt coefficients and update of the input delay line.</span>
<a name="l00130"></a>00130 <span class="keywordflow">for</span> ( n=0; n<inputFrames.size(); n++ ) {
<a name="l00131"></a>00131 x_t = inputLine_.tick( inputFrames[ n ] );
<a name="l00132"></a>00132 <span class="keywordflow">for</span> ( delay_=1; delay_<= tMax_; delay_++ ) {
<a name="l00133"></a>00133 x_t_T = inputLine_.tapOut( delay_ );
<a name="l00134"></a>00134 coeff = x_t - x_t_T;
<a name="l00135"></a>00135 dt[delay_] += coeff * coeff;
<a name="l00136"></a>00136 }
<a name="l00137"></a>00137 }
<a name="l00138"></a>00138
<a name="l00139"></a>00139 <span class="comment">// Calculation of the pitch tracking function and test for the minima.</span>
<a name="l00140"></a>00140 <span class="keywordflow">for</span> ( delay_=1; delay_<=tMax_; delay_++ ) {
<a name="l00141"></a>00141 cumDt[delay_] = dt[delay_] + cumDt[delay_-1];
<a name="l00142"></a>00142 dpt[delay_] = dt[delay_] * delay_ / cumDt[delay_];
<a name="l00143"></a>00143
<a name="l00144"></a>00144 <span class="comment">// Look for a minimum</span>
<a name="l00145"></a>00145 <span class="keywordflow">if</span> ( dpt[delay_-1]-dpt[delay_-2] < 0 && dpt[delay_]-dpt[delay_-1] > 0 ) {
<a name="l00146"></a>00146 <span class="comment">// Check if the minimum is under the threshold</span>
<a name="l00147"></a>00147 <span class="keywordflow">if</span> ( dpt[delay_-1] < threshold_ ){
<a name="l00148"></a>00148 lastPeriod_ = delay_-1;
<a name="l00149"></a>00149 <span class="comment">// If a minimum is found, we can stop the loop</span>
<a name="l00150"></a>00150 <span class="keywordflow">break</span>;
<a name="l00151"></a>00151 }
<a name="l00152"></a>00152 <span class="keywordflow">else</span> <span class="keywordflow">if</span> ( dpt[alternativePitch] > dpt[delay_-1] )
<a name="l00153"></a>00153 <span class="comment">// Otherwise we store it if it is the current global minimum</span>
<a name="l00154"></a>00154 alternativePitch = delay_-1;
<a name="l00155"></a>00155 }
<a name="l00156"></a>00156 }
<a name="l00157"></a>00157
<a name="l00158"></a>00158 <span class="comment">// Test for the last period length.</span>
<a name="l00159"></a>00159 <span class="keywordflow">if</span> ( dpt[delay_]-dpt[delay_-1] < 0 ) {
<a name="l00160"></a>00160 <span class="keywordflow">if</span> ( dpt[delay_] < threshold_ )
<a name="l00161"></a>00161 lastPeriod_ = delay_;
<a name="l00162"></a>00162 <span class="keywordflow">else</span> <span class="keywordflow">if</span> ( dpt[alternativePitch] > dpt[delay_] )
<a name="l00163"></a>00163 alternativePitch = delay_;
<a name="l00164"></a>00164 }
<a name="l00165"></a>00165
<a name="l00166"></a>00166 <span class="keywordflow">if</span> ( lastPeriod_ == tMax_+1 )
<a name="l00167"></a>00167 <span class="comment">// No period has been under the threshold so we used the global minimum</span>
<a name="l00168"></a>00168 lastPeriod_ = alternativePitch;
<a name="l00169"></a>00169
<a name="l00170"></a>00170 <span class="comment">// We put the new zero output coefficients in the output delay line and </span>
<a name="l00171"></a>00171 <span class="comment">// we get the previous calculated coefficients</span>
<a name="l00172"></a>00172 outputLine_.tick( zeroFrame, outputFrames );
<a name="l00173"></a>00173
<a name="l00174"></a>00174 <span class="comment">// Initialization of the Hamming window used in the algorithm</span>
<a name="l00175"></a>00175 <span class="keywordflow">for</span> ( <span class="keywordtype">int</span> n=-(<span class="keywordtype">int</span>)lastPeriod_; n<(int)lastPeriod_; n++ )
<a name="l00176"></a>00176 window[n+lastPeriod_] = (1 + cos(PI*n/lastPeriod_)) / 2 ;
<a name="l00177"></a>00177
<a name="l00178"></a>00178 <span class="keywordtype">int</span> M; <span class="comment">// Index of reading in the input delay line</span>
<a name="l00179"></a>00179 <span class="keywordtype">int</span> N; <span class="comment">// Index of writing in the output delay line</span>
<a name="l00180"></a>00180 <span class="keywordtype">double</span> sample; <span class="comment">// Temporary storage for the new coefficient</span>
<a name="l00181"></a>00181
<a name="l00182"></a>00182 <span class="comment">// We loop for all the frames of length lastPeriod_ presents between inputPtr and tMax_</span>
<a name="l00183"></a>00183 <span class="keywordflow">for</span> ( ; inputPtr<(int)(tMax_-lastPeriod_); inputPtr+=lastPeriod_ ) {
<a name="l00184"></a>00184 <span class="comment">// Test for the decision of compression/expansion</span>
<a name="l00185"></a>00185 <span class="keywordflow">while</span> ( outputPtr < inputPtr ) {
<a name="l00186"></a>00186 <span class="comment">// Coefficients for the linear interpolation</span>
<a name="l00187"></a>00187 env[1] = fmod( outputPtr + tMax_, 1.0 );
<a name="l00188"></a>00188 env[0] = 1.0 - env[1];
<a name="l00189"></a>00189 M = tMax_ - inputPtr + lastPeriod_ - 1; <span class="comment">// New reading pointer</span>
<a name="l00190"></a>00190 N = 2*tMax_ - (<span class="keywordtype">unsigned</span> long)floor(outputPtr + tMax_) + lastPeriod_ - 1; <span class="comment">// New writing pointer</span>
<a name="l00191"></a>00191 <span class="keywordflow">for</span> ( <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> j=0; j<2*lastPeriod_; j++,M--,N-- ) {
<a name="l00192"></a>00192 sample = inputLine_.tapOut(M) * window[j] / 2.;
<a name="l00193"></a>00193 <span class="comment">// Linear interpolation</span>
<a name="l00194"></a>00194 outputLine_.addTo(env[0] * sample, N);
<a name="l00195"></a>00195 outputLine_.addTo(env[1] * sample, N-1);
<a name="l00196"></a>00196 }
<a name="l00197"></a>00197 outputPtr = outputPtr + lastPeriod_ * periodRatio_; <span class="comment">// new output pointer</span>
<a name="l00198"></a>00198 }
<a name="l00199"></a>00199 }
<a name="l00200"></a>00200 <span class="comment">// Shifting of the pointers waiting for the new frame of length tMax_.</span>
<a name="l00201"></a>00201 outputPtr -= tMax_;
<a name="l00202"></a>00202 inputPtr -= tMax_;
<a name="l00203"></a>00203 }
</pre></div></p>
</div>
</div>
<hr/>The documentation for this class was generated from the following file:<ul>
<li><a class="el" href="LentPitShift_8h_source.html">LentPitShift.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>
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