blob: a847e50e247fa41aec1142df84ad8cbf82043c89 (
plain)
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
|
<?xml version="1.0" encoding="UTF-8"?>
<!--
* Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
* Copyright (C) ????-2006 - INRIA - Scilab
*
* This file must be used under the terms of the CeCILL.
* This source file is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at
* http://www.cecill.info/licences/Licence_CeCILL_V2.1-en.txt
*
-->
<refentry xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:svg="http://www.w3.org/2000/svg" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:db="http://docbook.org/ns/docbook" xmlns:scilab="http://www.scilab.org" xml:lang="en" xml:id="analyze">
<refnamediv>
<refname>analyze</refname>
<refpurpose>frequency plot of a sound signal</refpurpose>
</refnamediv>
<refsection>
<title>Arguments</title>
<variablelist>
<varlistentry>
<term>fmin,fmax,rate,points</term>
<listitem>
<para>scalars. default values fmin=100,fmax=1500,rate=22050,points=8192;</para>
</listitem>
</varlistentry>
</variablelist>
</refsection>
<refsection>
<title>Description</title>
<para>
Make a frequency plot of the signal <literal>w</literal> with sampling rate <literal>rate</literal>.
The data must be at least <literal>points</literal> long.
The maximal frequency plotted will be <literal>fmax</literal>, the minimal <literal>fmin</literal>.
</para>
</refsection>
<refsection>
<title>Examples</title>
<programlisting role="example"><![CDATA[
// At first we create 0.5 seconds of sound parameters.
t=soundsec(0.5);
// Then we generate the sound.
s=sin(440*t)+sin(220*t)/2+sin(880*t)/2;
[nr,nc]=size(t);
s(nc/2:nc)=sin(330*t(nc/2:nc));
analyze(s);
]]></programlisting>
<scilab:image>
t=soundsec(0.5);
s=sin(440*t)+sin(220*t)/2+sin(880*t)/2;
[nr,nc]=size(t);
s(nc/2:nc)=sin(330*t(nc/2:nc));
analyze(s);
</scilab:image>
</refsection>
</refentry>
|
