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<span class="path"><a href="index.html">FOSSEE Signal Processing Toolbox</a> >> <a href="section_be19baaac84b122b8ad501d34462f5bf.html">FOSSEE Signal Processing Toolbox</a> > modulate</span>
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<div class="refnamediv"><h1 class="refname">modulate</h1>
<p class="refpurpose">Modulates signal according to the modulation method</p></div>
<div class="refsynopsisdiv"><h3 class="title">Calling Sequence</h3>
<div class="synopsis"><pre><span class="default">y</span><span class="default">=</span><span class="functionid">modulate</span><span class="default">(</span><span class="default">x</span><span class="default">,</span><span class="default">fc</span><span class="default">,</span><span class="default">fs</span><span class="default">,</span><span class="default">method</span><span class="default">,</span><span class="default">opt</span><span class="default">)</span>
<span class="default">[</span><span class="default">y</span><span class="default">,</span><span class="default">t</span><span class="default">]=</span><span class="functionid">modulate</span><span class="default">(</span><span class="default">x</span><span class="default">,</span><span class="default">fc</span><span class="default">,</span><span class="default">fs</span><span class="default">,</span><span class="default">method</span><span class="default">,</span><span class="default">opt</span><span class="default">)</span></pre></div></div>
<div class="refsection"><h3 class="title">Parameters</h3>
<dl></dl></div>
<div class="refsection"><h3 class="title">Description</h3>
<p class="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.</p>
<p class="para">If x is a matrix, its columns are modulated.
Example
y =</p>
<p class="para">1. 1. 0. 0.
Author
Ankur Mallick</p></div>
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