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<?xml version="1.0" encoding="UTF-8"?>
<!--
*
* This help file was generated from modulate.sci using help_from_sci().
*
-->
<refentry version="5.0-subset Scilab" xml:id="modulate" xml:lang="en"
xmlns="http://docbook.org/ns/docbook"
xmlns:xlink="http://www.w3.org/1999/xlink"
xmlns:svg="http://www.w3.org/2000/svg"
xmlns:ns3="http://www.w3.org/1999/xhtml"
xmlns:mml="http://www.w3.org/1998/Math/MathML"
xmlns:scilab="http://www.scilab.org"
xmlns:db="http://docbook.org/ns/docbook">
<refnamediv>
<refname>modulate</refname>
<refpurpose>Modulates signal according to the modulation method</refpurpose>
</refnamediv>
<refsynopsisdiv>
<title>Calling Sequence</title>
<synopsis>
y=modulate(x,fc,fs,method,opt)
[y,t]=modulate(x,fc,fs,method,opt)
</synopsis>
</refsynopsisdiv>
<refsection>
<title>Parameters</title>
<variablelist>
</variablelist>
</refsection>
<refsection>
<title>Description</title>
<para>
[y,t]=modulate(x,fc,fs,method,opt)
Returns the modulated vector y and the time vector 't'
Modulation is performed according to the following table
METHOD MODULATION SCHEME
'am', Amplitude modulation, double side-band, suppressed carrier
'amdsb-sc' opt not used. This is the default method.
'amdsb-tc' Amplitude modulation, double side-band, transmitted carrier
opt is a scalar subtracted from x before multiplying x
with the carrier wave. It defaults to min(min(x)) so that
the input signal after offset is always non-negative
'amssb' Amplitude modulation, single side-band
OPT not used.
'fm' Frequency modulation
opt is the constant of frequency modulation.
opt = (fc/fs)*2*pi/max(max(abs(x))) by default
'pm' Phase modulation
OPT is the constant of phase modulation.
opt = pi/max(max(abs(x))) by default
Phase lies between -pi and +pi
'pwm' Pulse width modulation
opt='left' corresponds to left justified pulses.
opt='centered' correspondes to centered pulses.
The default value of opt is 'left'.
'ppm' Pulse position modulation
opt is a scalar between 0 and 1 which specifies the pulse
width in fractions of the carrier period with default value 0.1.
'qam' Quadrature amplitude modulation
opt is a matrix of the same size as X which is modulated in
quadrature with x.
</para>
<para>
If x is a matrix, its columns are modulated.
Example
y =
</para>
<para>
1. 1. 0. 0.
Author
Ankur Mallick
</para>
</refsection>
</refentry>
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