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<div class="refentry" title="lorismorph">
<a id="lorismorph"></a>
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<a id="IndexLorisMorph" class="indexterm"></a>
<div class="refnamediv">
<h2>
<span class="refentrytitle">lorismorph</span>
</h2>
<p>lorismorph — Morphs two stored sets of bandwidth-enhanced partials
and stores a new set of partials representing the morphed
sound. The morph is performed by linearly interpolating the
parameter envelopes (frequency, amplitude, and bandwidth, or
noisiness) of the bandwidth-enhanced partials according to
control-rate frequency, amplitude, and bandwidth morphing
functions. </p>
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<div class="refsect1" title="Syntax">
<a id="id2995866"></a>
<h2>Syntax</h2>
<pre class="synopsis"><span class="command"><strong>lorismorph</strong></span> isrcidx, itgtidx, istoreidx, kfreqmorphenv, kampmorphenv, kbwmorphenv</pre>
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<div class="refsect1" title="Description">
<a id="id2995884"></a>
<h2>Description</h2>
<p><span class="emphasis"><em>lorismorph</em></span> morphs two stored sets of bandwidth-enhanced
partials and stores a new set of partials representing the morphed
sound. The morph is performed by linearly interpolating the
parameter envelopes (frequency, amplitude, and bandwidth, or
noisiness) of the bandwidth-enhanced partials according to
control-rate frequency, amplitude, and bandwidth morphing
functions.
</p>
</div>
<div class="refsect1" title="Initialization">
<a id="id2996236"></a>
<h2>Initialization</h2>
<p><span class="emphasis"><em>istoreidx, ireadidx, isrcidx, itgtidx</em></span> are
labels that identify a stored set of bandwidth-enhanced
partials. <span class="emphasis"><em>lorisread</em></span> imports partials from a SDIF file and stores them
with the integer label istoreidx. <span class="emphasis"><em>lorismorph</em></span> morphs sets of partials
labeled <span class="emphasis"><em>isrcidx</em></span> and <span class="emphasis"><em>itgtidx</em></span>, and stores the resulting partials with
the integer label <span class="emphasis"><em>istoreidx</em></span>. <span class="emphasis"><em>lorisplay</em></span> renders the partials stored
with the label <span class="emphasis"><em>ireadidx</em></span>. The labels are used only at initialization
time, and may be reused without any cost or benefit in efficiency, and
without introducing any interaction between instruments or
instances.</p>
</div>
<div class="refsect1" title="Performance">
<a id="id2996705"></a>
<h2>Performance</h2>
<p><span class="emphasis"><em>lorismorph</em></span> generates a set of bandwidth-enhanced partials by
morphing two stored sets of partials, the source and target partials,
which may have been imported using <span class="emphasis"><em>lorisread</em></span>, or generated by another
unit generator, including another instance of <span class="emphasis"><em>lorismorph</em></span>. The morph is
performed by interpolating the parameters of corresponding (labeled)
partials in the two source sounds. The sound morph is
described by three control-rate morphing envelopes. <span class="emphasis"><em>kfreqmorphenv</em></span>
describes the interpolation of partial frequency values in the two
source sounds. When <span class="emphasis"><em>kfreqmorphenv</em></span> is 0, partial frequencies are
obtained from the partials stored at <span class="emphasis"><em>isrcidx</em></span>. When <span class="emphasis"><em>kfreqmorphenv</em></span> is 1,
partial frequencies are obtained from the partials at <span class="emphasis"><em>itgtidx</em></span>. When
<span class="emphasis"><em>kfreqmorphenv</em></span> is between 0 and 1, the partial frequencies are
interpolated between corresponding source and target
partials. Interpolation of partial amplitudes and bandwidth
(noisiness) coefficients are similarly described by <span class="emphasis"><em>kampmorphenv</em></span> and
<span class="emphasis"><em>kbwmorphenv</em></span>.</p>
</div>
<div class="refsect1" title="Credits">
<a id="id2996769"></a>
<h2>Credits</h2>
<p>This implementation of the Loris unit generators was written by Kelly
Fitz (<a class="ulink" href="mailto:loris@cerlsoundgroup.org" target="_top">loris@cerlsoundgroup.org</a>). It is patterned after a prototype implementation of the
<span class="emphasis"><em>lorisplay</em></span> unit generator written by Corbin Champion, and based on the
method of Bandwidth-Enhanced Additive Synthesis and on the sound
morphing algorithms implemented in the Loris library for sound
modeling and manipulation. The opcodes were further adapted as a
plugin for Csound 5 by Michael gogins.</p>
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