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<div class="refentry" title="pvshift">
<a id="pvshift"></a>
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<a id="IndexPvshift" class="indexterm"></a>
<div class="refnamediv">
<h2>
<span class="refentrytitle">pvshift</span>
</h2>
<p>pvshift —
Shift the frequency components of a pv stream, stretching/compressing
its spectrum.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp38847184"></a>
<h2>Description</h2>
<p>
Shift the frequency components of a pv stream, stretching/compressing
its spectrum.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp38855032"></a>
<h2>Syntax</h2>
<pre class="synopsis">fsig <span class="command"><strong>pvshift</strong></span> fsigin, kshift, klowest[, kkeepform, igain, kcoefs]</pre>
</div>
<div class="refsect1" title="Performance">
<a id="idp38856168"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>fsig</em></span> -- output pv stream
</p>
<p>
<span class="emphasis"><em>fsigin</em></span> -- input pv stream
</p>
<p>
<span class="emphasis"><em>kshift</em></span> -- shift amount (in Hz, positive or negative).
</p>
<p>
<span class="emphasis"><em>klowest</em></span> -- lowest frequency to be shifted.
</p>
<p>
<span class="emphasis"><em>kkeepform</em></span> -- attempt to keep input signal
formants; 0: do not keep formants;
1: keep formants using a liftered cepstrum method; 2: keep formants by
using a true envelope method
(defaults to 0).
</p>
<p>
<span class="emphasis"><em>kgain</em></span> -- amplitude scaling (defaults to 1).
</p>
<p>
<span class="emphasis"><em>kcoefs</em></span> -- number of cepstrum coefs used in formant preservation (defaults to 80).
</p>
<p>
This opcode will shift the components of a pv stream, from a certain
frequency upwards, up or down a fixed amount (in Hz). It can be used to
transform a harmonic spectrum into an inharmonic one. The <span class="emphasis"><em>kkeepform</em></span> flag
can be used to try and preserve formants for possibly interesting and unusual
spectral modifications.
</p>
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</td>
<th align="left">Warning</th>
</tr>
<tr>
<td align="left" valign="top">
<p>
It is unsafe to use the same f-variable for both input and output of pvs opcodes. Using the same one might lead to undefined behavior on some opcodes. Use a different one on the left and right sides of the opcode.
</p>
</td>
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<div class="refsect1" title="Examples">
<a id="idp38861240"></a>
<h2>Examples</h2>
<p>
</p>
<div class="example">
<a id="idp38861704"></a>
<p class="title">
<strong>Example 661. Example</strong>
</p>
<div class="example-contents">
<pre class="programlisting">
asig <span class="opc">in</span> <span class="comment">; get the signal in</span>
fsig <span class="opc">pvsanal</span> asig, 1024, 256, 1024, 1 <span class="comment">; analyse it</span>
ftps <span class="opc">pvshift</span> fsig, 100, 0 <span class="comment">; add 100 Hz to each component</span>
atps <span class="opc">pvsynth</span> ftps <span class="comment">; synthesise it</span></pre>
</div>
</div>
<p><br class="example-break" />
</p>
<p>
Depending on the input, this will transform a pitched sound into an inharmonic,
bell-like sound.
</p>
<p>
Here is an example of the use of the <span class="emphasis"><em>pvshift</em></span> opcode. It uses the file <a class="ulink" href="examples/pvshift.csd" target="_top"><em class="citetitle">pvshift.csd</em></a>.
</p>
<div class="example">
<a id="idp38925568"></a>
<p class="title">
<strong>Example 662. Example of the <span class="emphasis"><em>pvshift</em></span> 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>
<pre class="programlisting">
<span class="csdtag"><CsoundSynthesizer></span>
<span class="csdtag"><CsOptions></span>
-odac
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">ksmps</span> <span class="op">=</span> 16
<span class="ohdr">nchnls</span> <span class="op">=</span> 1
<span class="ohdr">0dbfs</span> <span class="op">=</span> 1
<span class="comment">;; example written by joachim heintz 2009</span>
<span class="oblock">instr</span> 1
ishift <span class="op">=</span> p4<span class="comment">; shift amount in Hz</span>
ilowest <span class="op">=</span> p5<span class="comment">; lowest frequency to be shifted</span>
ikeepform <span class="op">=</span> p6<span class="comment">; 0=no formant keeping, 1=keep by amps, 2=keep by spectral envelope</span>
ifftsize <span class="op">=</span> 1024
ioverlap <span class="op">=</span> ifftsize <span class="op">/</span> 4
iwinsize <span class="op">=</span> ifftsize
iwinshape <span class="op">=</span> 1<span class="comment">; von-Hann window</span>
Sfile <span class="op">=</span> "fox.wav"
ain <span class="opc">soundin</span> Sfile
fftin <span class="opc">pvsanal</span> ain, ifftsize, ioverlap, iwinsize, iwinshape<span class="comment">; fft-analysis of file</span>
fshift <span class="opc">pvshift</span> fftin, ishift, ilowest, ikeepform<span class="comment">; shift frequencies</span>
aout <span class="opc">pvsynth</span> fshift<span class="comment">; resynthesize</span>
<span class="opc">out</span> aout
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">i</span> 1 0 2.757 0 0 0<span class="comment">; no shift at all</span>
<span class="stamnt">i</span> 1 3 2.757 100 0 0<span class="comment">; shift all frequencies by 100 Hz</span>
<span class="stamnt">i</span> 1 6 2.757 200 0 0<span class="comment">; by 200 Hz</span>
<span class="stamnt">i</span> 1 9 2.757 200 0 1<span class="comment">; keep formants by method 1</span>
<span class="stamnt">i</span> 1 12 2.757 200 0 2<span class="comment">; by method 2</span>
<span class="stamnt">i</span> 1 15 2.757 200 1000 0<span class="comment">; shift by 200 Hz but just above 1000 Hz</span>
<span class="stamnt">i</span> 1 18 2.757 1000 500 0<span class="comment">; shift by 1000 Hz above 500 Hz</span>
<span class="stamnt">i</span> 1 21 2.757 1000 300 0<span class="comment">; above 300 Hz</span>
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
</p>
</div>
<div class="refsect1" title="See Also">
<a id="idp38928056"></a>
<h2>See Also</h2>
<p>
<a class="link" href="pvsanal.html" title="pvsanal"><em class="citetitle">pvsanal</em></a>,
<a class="link" href="pvsynth.html" title="pvsynth"><em class="citetitle">pvsynth</em></a>,
<a class="link" href="pvsadsyn.html" title="pvsadsyn"><em class="citetitle">pvsadsyn</em></a>
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp38930032"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Victor Lazzarini</td>
</tr>
<tr>
<td>November 2004 </td>
</tr>
</table>
<p>
</p>
<p>New plugin in version 5</p>
<p>November 2004.</p>
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