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
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
|
<refentry id="ntrpol">
<indexterm id="IndexNtrpol"><primary>ntrpol</primary></indexterm>
<refentryinfo><title>Signal Modifiers:Sample Level Operators</title></refentryinfo>
<refmeta>
<refentrytitle>ntrpol</refentrytitle>
</refmeta>
<refnamediv>
<refname>ntrpol</refname>
<refpurpose>
Calculates the weighted mean value of two input signals.
</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<para>
Calculates the weighted mean value (i.e. linear interpolation) of two input signals
</para>
</refsect1>
<refsect1>
<title>Syntax</title>
<synopsis>ares <command>ntrpol</command> asig1, asig2, kpoint [, imin] [, imax]</synopsis>
<synopsis>ires <command>ntrpol</command> isig1, isig2, ipoint [, imin] [, imax]</synopsis>
<synopsis>kres <command>ntrpol</command> ksig1, ksig2, kpoint [, imin] [, imax]</synopsis>
</refsect1>
<refsect1>
<title>Initialization</title>
<para>
<emphasis>imin</emphasis> -- minimum xpoint value (optional, default 0)
</para>
<para>
<emphasis>imax</emphasis> -- maximum xpoint value (optional, default 1)
</para>
</refsect1>
<refsect1>
<title>Performance</title>
<para>
<emphasis>xsig1</emphasis>, <emphasis>xsig2</emphasis> -- input signals
</para>
<para>
<emphasis>xpoint</emphasis> -- interpolation point between the two values
</para>
<para>
<emphasis>ntrpol</emphasis> opcode outputs the linear interpolation between two input values. <emphasis>xpoint</emphasis> is the distance of evaluation point from the first value. With the default values of <emphasis>imin</emphasis> and <emphasis>imax</emphasis>, (0 and 1) a zero value indicates no distance from the first value and the maximum distance from the second one. With a 0.5 value, <emphasis>ntrpol</emphasis> will output the mean value of the two inputs, indicating the exact half point between <emphasis>xsig1</emphasis> and <emphasis>xsig2</emphasis>. A 1 value indicates the maximum distance from the first value and no distance from the second one. The range of <emphasis>xpoint</emphasis> can be also defined with <emphasis>imin</emphasis> and <emphasis>imax</emphasis> to make its management easier.
</para>
<para>
These opcodes are useful for crossfading two signals.
</para>
</refsect1>
<refsect1>
<title>Examples</title>
<para>
Here is an example of the ntrpol opcode. It uses the file <ulink url="examples/ntrpol.csd"><citetitle>ntrpol.csd</citetitle></ulink>.
<example>
<title>Example of the ntrpol opcode.</title>
<para>See the sections <link linkend="UsingRealTime"><citetitle>Real-time Audio</citetitle></link> and <link linkend="CommandFlags"><citetitle>Command Line Flags</citetitle></link> for more information on using command line flags.</para>
<xi:include href="examples-xml/ntrpol.csd.xml" xmlns:xi="http://www.w3.org/2001/XInclude"/>
</example>
</para>
</refsect1>
<refsect1>
<title>Credits</title>
<para>
<simplelist>
<member>Author: &namegabriel;</member>
<member>Italy</member>
<member>October 1998</member>
</simplelist>
</para>
<para>New in Csound version 3.49</para>
</refsect1>
</refentry>
|
