1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
|
<refentry id="lorisplay">
<indexterm id="IndexLorisPlay"><primary>lorisplay</primary></indexterm>
<refentryinfo><title>Spectral Processing:Loris</title></refentryinfo>
<refmeta>
<refentrytitle>lorisplay</refentrytitle>
</refmeta>
<refnamediv>
<refname>lorisplay</refname>
<refpurpose>renders a stored set of bandwidth-enhanced partials using the method of Bandwidth-Enhanced Additive Synthesis implemented in the Loris software, applying control-rate frequency, amplitude, and bandwidth scaling envelopes.</refpurpose>
</refnamediv>
<refsect1>
<title>Syntax</title>
<synopsis>ar <command>lorisplay</command> ireadidx, kfreqenv, kampenv, kbwenv</synopsis>
</refsect1>
<refsect1>
<title>Description</title>
<para><emphasis>lorisplay</emphasis> renders a stored set of
bandwidth-enhanced partials using the method of Bandwidth-Enhanced
Additive Synthesis implemented in the Loris software, applying
control-rate frequency, amplitude, and bandwidth scaling
envelopes.</para>
</refsect1>
<refsect1>
<title>Initialization</title>
<para><emphasis>istoreidx, ireadidx, isrcidx, itgtidx</emphasis> are
labels that identify a stored set of bandwidth-enhanced
partials. <emphasis>lorisread</emphasis> imports partials from a SDIF file and stores them
with the integer label istoreidx. <emphasis>lorismorph</emphasis> morphs sets of partials
labeled <emphasis>isrcidx</emphasis> and <emphasis>itgtidx</emphasis>, and stores the resulting partials with
the integer label <emphasis>istoreidx</emphasis>. <emphasis>lorisplay</emphasis> renders the partials stored
with the label <emphasis>ireadidx</emphasis>. 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.</para>
</refsect1>
<refsect1>
<title>Performance</title>
<para><emphasis>lorisplay</emphasis> implements signal reconstruction using
Bandwidth-Enhanced Additive Synthesis. The control data is obtained
from a stored set of bandwidth-enhanced partials imported from an SDIF
file using <emphasis>lorisread</emphasis> or constructed by another unit generator such as
<emphasis>lorismorph</emphasis>. <emphasis>kfreqenv</emphasis> is a control-rate transposition factor: a value
of 1 incurs no transposition, 1.5 transposes up a perfect fifth, and
.5 down an octave. <emphasis>kampenv</emphasis> is a control-rate scale factor that is
applied to all partial amplitude envelopes. kbwenv is a control-rate
scale factor that is applied to all partial bandwidth or noisiness
envelopes. The bandwidth-enhanced partial data is stored in memory
with a specified label for future access by another generator.</para>
</refsect1>
<refsect1>
<title>Credits</title>
<para>This implementation of the Loris unit generators was written by Kelly
Fitz (<ulink
url="mailto:loris@cerlsoundgroup.org">loris@cerlsoundgroup.org</ulink>). It is patterned after a prototype implementation of the
<emphasis>lorisplay</emphasis> 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.</para>
</refsect1>
</refentry>
|
