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<h2>
<span class="refentrytitle">unwrap</span>
</h2>
<p>unwrap —
Applies a unwrapping operation to an array of phase values.
</p>
</div>
<div class="refsect1">
<a id="idm281472876861960"></a>
<h2>Description</h2>
<p>
Applies a unwrapping operation to a vector of phases stored in
an array. The output is an array with phases in the range of
[-pi,pi).
</p>
</div>
<div class="refsect1">
<a id="idm281472876790216"></a>
<h2>Syntax</h2>
<pre class="synopsis">kout[] <span class="command"><strong>unwrap</strong></span> kin[] </pre>
</div>
<div class="refsect1">
<a id="idm281472876788008"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>kout[]</em></span> -- output array containing the
unwrapped phases. It will be created if it does not exist.
</p>
<p>
<span class="emphasis"><em>kin[]</em></span> -- input array containing the input vector.
</p>
</div>
<div class="refsect1">
<a id="idm281472876785416"></a>
<h2>Examples</h2>
<p>
Here is an example of the unwrap opcode. It uses the file <a class="ulink" href="examples/unwrap.csd" target="_top"><em class="citetitle">unwrap.csd</em></a>.</p>
<div class="example">
<a id="idm281472876783464"></a>
<p class="title">
<strong>Example 1038. Example of the unwrap opcode.</strong>
</p>
<div class="example-contents">
<p>See the sections <a class="link" href="UsingRealTime.html" title="Real-Time Audio"><em class="citetitle">Real-time Audio</em></a> and <a class="link" href="CommandFlags.html" title="Csound command line"><em class="citetitle">Command Line Flags</em></a> for more information on using command line flags.</p>
<div class="refsect1">
<a id="idm281472697229112"></a>
<pre class="programlisting">
<span class="nt"><CsoundSynthesizer></span>
<span class="nt"><CsOptions></span>
<span class="nt"></CsOptions></span>
<span class="nt"><CsInstruments></span>
<span class="vg">ksmps</span> <span class="o">=</span> <span class="mi">64</span>
i<span class="n">fn1</span> <span class="nb">ftgen</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">512</span><span class="p">,</span> <span class="mi">7</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">512</span><span class="p">,</span> <span class="mi">0</span>
i<span class="n">fn2</span> <span class="nb">ftgen</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">512</span><span class="p">,</span> <span class="mi">7</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">512</span><span class="p">,</span> <span class="mi">0</span>
<span class="kd">opcode</span> <span class="nf">PVA</span><span class="p">,</span><span class="kt">k[]k[]k</span><span class="p">,</span><span class="kt">aii</span>
a<span class="n">sig</span><span class="p">,</span>i<span class="n">size</span><span class="p">,</span>i<span class="n">hop</span> <span class="nb">xin</span>
i<span class="n">olaps</span> <span class="nb">init</span> i<span class="n">size</span><span class="o">/</span>i<span class="n">hop</span>
k<span class="n">cnt</span> <span class="nb">init</span> <span class="mi">0</span>
k<span class="n">row</span> <span class="nb">init</span> <span class="mi">1</span>
k<span class="n">In</span><span class="p">[]</span> <span class="nb">init</span> i<span class="n">size</span>
k<span class="n">Olph</span><span class="p">[]</span> <span class="nb">init</span> i<span class="n">size</span><span class="o">/</span><span class="mi">2</span> <span class="o">+</span> <span class="mi">1</span>
i<span class="n">fac</span> <span class="o">=</span> <span class="p">(</span><span class="vg">sr</span><span class="o">/</span><span class="p">(</span>i<span class="n">hop</span><span class="o">*</span><span class="mi">2</span><span class="o">*</span><span class="cp">$M_PI</span><span class="p">))</span><span class="c1">;</span>
i<span class="n">scal</span> <span class="o">=</span> <span class="p">(</span><span class="mi">2</span><span class="o">*</span><span class="cp">$M_PI</span><span class="o">*</span>i<span class="n">hop</span><span class="o">/</span>i<span class="n">size</span><span class="p">)</span><span class="c1">;</span>
k<span class="n">fl</span> <span class="o">=</span> <span class="mi">0</span>
k<span class="n">In</span> <span class="nb">shiftin</span> a<span class="n">sig</span>
<span class="k">if</span> k<span class="n">cnt</span> <span class="o">==</span> i<span class="n">hop</span> <span class="k">then</span>
k<span class="n">Win</span><span class="p">[]</span> <span class="nb">window</span> k<span class="n">In</span><span class="p">,</span>k<span class="n">row</span><span class="o">*</span>i<span class="n">hop</span>
k<span class="n">Spec</span><span class="p">[]</span> <span class="nb">rfft</span> k<span class="n">Win</span>
k<span class="n">Mags</span><span class="p">[]</span> <span class="nb">mags</span> k<span class="n">Spec</span>
k<span class="n">Pha</span><span class="p">[]</span> <span class="nb">phs</span> k<span class="n">Spec</span>
k<span class="n">Delta</span><span class="p">[]</span> <span class="o">=</span> k<span class="n">Pha</span> <span class="o">-</span> k<span class="n">Olph</span>
k<span class="n">Olph</span> <span class="o">=</span> k<span class="n">Pha</span>
k<span class="n">k</span> <span class="o">=</span> <span class="mi">0</span>
k<span class="n">Delta</span> <span class="nb">unwrap</span> k<span class="n">Delta</span>
<span class="k">while</span> k<span class="n">k</span> <span class="o"><</span> i<span class="n">size</span><span class="o">/</span><span class="mi">2</span> <span class="k">do</span>
k<span class="n">Pha</span><span class="p">[</span>k<span class="n">k</span><span class="p">]</span> <span class="o">=</span> <span class="p">(</span>k<span class="n">Delta</span><span class="p">[</span>k<span class="n">k</span><span class="p">]</span> <span class="o">+</span> k<span class="n">k</span><span class="o">*</span>i<span class="n">scal</span><span class="p">)</span><span class="o">*</span>i<span class="n">fac</span>
k<span class="n">k</span> <span class="o">+=</span> <span class="mi">1</span>
<span class="k">od</span>
k<span class="n">row</span> <span class="o">=</span> <span class="p">(</span>k<span class="n">row</span><span class="o">+</span><span class="mi">1</span><span class="p">)</span><span class="o">%</span>i<span class="n">olaps</span>
k<span class="n">cnt</span> <span class="o">=</span> <span class="mi">0</span>
k<span class="n">fl</span> <span class="o">=</span> <span class="mi">1</span>
<span class="k">endif</span>
<span class="nb">xout</span> k<span class="n">Mags</span><span class="p">,</span>k<span class="n">Pha</span><span class="p">,</span>k<span class="n">fl</span>
k<span class="n">cnt</span> <span class="o">+=</span> <span class="vg">ksmps</span>
<span class="kd">endop</span>
<span class="kd">opcode</span> <span class="nf">PVS</span><span class="p">,</span><span class="kt">a</span><span class="p">,</span><span class="kt">k[]k[]kii</span>
k<span class="n">Mags</span><span class="p">[],</span>k<span class="n">Fr</span><span class="p">[],</span>k<span class="n">fl</span><span class="p">,</span>i<span class="n">size</span><span class="p">,</span>i<span class="n">hop</span> <span class="nb">xin</span>
i<span class="n">olaps</span> <span class="nb">init</span> i<span class="n">size</span><span class="o">/</span>i<span class="n">hop</span>
i<span class="n">fac</span> <span class="o">=</span> i<span class="n">hop</span><span class="o">*</span><span class="mi">2</span><span class="o">*</span><span class="cp">$M_PI</span><span class="o">/</span><span class="vg">sr</span><span class="c1">;</span>
i<span class="n">scal</span> <span class="o">=</span> <span class="vg">sr</span><span class="o">/</span>i<span class="n">size</span>
k<span class="n">row</span> <span class="nb">init</span> <span class="mi">0</span>
k<span class="n">Ola</span><span class="p">[]</span> <span class="nb">init</span> i<span class="n">size</span>
k<span class="n">Out</span><span class="p">[][]</span> <span class="nb">init</span> i<span class="n">olaps</span><span class="p">,</span>i<span class="n">size</span>
k<span class="n">Phs</span><span class="p">[]</span> <span class="nb">init</span> i<span class="n">size</span><span class="o">/</span><span class="mi">2</span><span class="o">+</span><span class="mi">1</span>
<span class="k">if</span> k<span class="n">fl</span> <span class="o">==</span> <span class="mi">1</span> <span class="k">then</span>
k<span class="n">k</span> <span class="o">=</span> <span class="mi">0</span>
<span class="k">while</span> k<span class="n">k</span> <span class="o"><</span> i<span class="n">size</span><span class="o">/</span><span class="mi">2</span> <span class="k">do</span>
k<span class="n">Fr</span><span class="p">[</span>k<span class="n">k</span><span class="p">]</span> <span class="o">=</span> <span class="p">(</span>k<span class="n">Fr</span><span class="p">[</span>k<span class="n">k</span><span class="p">]</span> <span class="o">-</span> k<span class="n">k</span><span class="o">*</span>i<span class="n">scal</span><span class="p">)</span><span class="o">*</span>i<span class="n">fac</span>
k<span class="n">k</span> <span class="o">+=</span> <span class="mi">1</span>
<span class="k">od</span>
k<span class="n">Phs</span> <span class="o">=</span> k<span class="n">Fr</span> <span class="o">+</span> k<span class="n">Phs</span>
k<span class="n">Spec</span><span class="p">[]</span> <span class="nb">pol2rect</span> k<span class="n">Mags</span><span class="p">,</span>k<span class="n">Phs</span>
k<span class="n">Row</span><span class="p">[]</span> <span class="nb">rifft</span> k<span class="n">Spec</span>
k<span class="n">Win</span><span class="p">[]</span> <span class="nb">window</span> k<span class="n">Row</span><span class="p">,</span> k<span class="n">row</span><span class="o">*</span>i<span class="n">hop</span>
k<span class="n">Out</span> <span class="nb">setrow</span> k<span class="n">Win</span><span class="p">,</span> k<span class="n">row</span>
k<span class="n">Ola</span> <span class="o">=</span> <span class="mi">0</span>
k<span class="n">k</span> <span class="o">=</span> <span class="mi">0</span>
<span class="k">until</span> k<span class="n">k</span> <span class="o">==</span> i<span class="n">olaps</span> <span class="k">do</span>
k<span class="n">Row</span> <span class="nb">getrow</span> k<span class="n">Out</span><span class="p">,</span> k<span class="n">k</span>
k<span class="n">Ola</span> <span class="o">=</span> k<span class="n">Ola</span> <span class="o">+</span> k<span class="n">Row</span>
k<span class="n">k</span> <span class="o">+=</span> <span class="mi">1</span>
<span class="k">od</span>
k<span class="n">row</span> <span class="o">=</span> <span class="p">(</span>k<span class="n">row</span><span class="o">+</span><span class="mi">1</span><span class="p">)</span><span class="o">%</span>i<span class="n">olaps</span>
<span class="k">endif</span>
<span class="nb">xout</span> <span class="nb">shiftout</span><span class="p">(</span>k<span class="n">Ola</span><span class="p">)</span><span class="o">/</span>i<span class="n">olaps</span>
<span class="kd">endop</span>
<span class="kd">instr</span> <span class="nf">1</span>
i<span class="n">si</span> <span class="o">=</span> <span class="mi">1024</span>
i<span class="n">hop</span> <span class="o">=</span> <span class="mi">128</span>
a<span class="n">1</span> <span class="nb">diskin2</span> <span class="s">"fox.wav"</span><span class="p">,</span><span class="mi">1</span><span class="p">,</span><span class="mi">0</span><span class="p">,</span><span class="mi">1</span> <span class="c1">; audio input</span>
k<span class="n">Mags</span><span class="p">[],</span>k<span class="n">Phs</span><span class="p">[],</span>k<span class="n">flg</span> <span class="nf">PVA</span> a<span class="n">1</span><span class="p">,</span>i<span class="n">si</span><span class="p">,</span>i<span class="n">hop</span>
a<span class="n">2</span> <span class="nf">PVS</span> k<span class="n">Mags</span><span class="p">,</span>k<span class="n">Phs</span><span class="p">,</span>k<span class="n">flg</span><span class="p">,</span>i<span class="n">si</span><span class="p">,</span>i<span class="n">hop</span>
<span class="nb">out</span> a<span class="n">2</span>
<span class="kd">endin</span>
<span class="nt"></CsInstruments></span>
<span class="nt"><CsScore></span>
<span class="nb">i</span><span class="mi">1</span> <span class="mi">0</span> <span class="mi">10</span>
<span class="nt"></CsScore></span>
<span class="nt"></CsoundSynthesizer></span>
</pre>
</div>
</div>
</div>
<br class="example-break" />
</div>
<div class="refsect1">
<a id="idm281472876779400"></a>
<h2>See Also</h2>
<p>
<a class="link" href="vectorial.html" title="Vectorial Opcodes"><em class="citetitle"></em>Vectorial opcodes</a>,
<a class="link" href="arrayOpcodes.html" title="Array Opcodes"><em class="citetitle"></em>array opcodes</a>
</p>
</div>
<div class="refsect1">
<a id="idm281472876776392"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Victor Lazzarini</td>
</tr>
<tr>
<td>NUI Maynooth</td>
</tr>
<tr>
<td>2014</td>
</tr>
</table>
<p>
</p>
<p>New in version 6.04</p>
</div>
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