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| author | rupak | 2020-01-21 19:05:09 +0530 |
|---|---|---|
| committer | rupak | 2020-01-21 19:05:09 +0530 |
| commit | d2f4d30ebcad7430e4f0495cae5c2b3a16be73ce (patch) | |
| tree | 8987d169ad87e930f137122a450c02dc5d13dcc5 /help/en_US/scilab_en_US_help/ssbdemod.html | |
| parent | 36aca8aaaee5cf8cb5452268fd07c0b558b000a3 (diff) | |
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diff --git a/help/en_US/scilab_en_US_help/ssbdemod.html b/help/en_US/scilab_en_US_help/ssbdemod.html new file mode 100644 index 0000000..1fe5a1a --- /dev/null +++ b/help/en_US/scilab_en_US_help/ssbdemod.html @@ -0,0 +1,110 @@ +<html><head> + <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> + <title>ssbdemod</title> + <style type="text/css" media="all"> + @import url("scilab_code.css"); + @import url("xml_code.css"); + @import url("c_code.css"); + @import url("style.css"); + </style> + </head> + <body> + <div class="manualnavbar"> + <table width="100%"><tr> + <td width="30%"> + <span class="previous"><a href="octave_functions.html"><< octave_functions</a></span> + + </td> + <td width="40%" class="center"> + <span class="top"><a href="section_1f049b1e3111e3d1d538e7603f77f589.html">FOSSEE_Communication_Systems_Toolbox</a></span> + + </td> + <td width="30%" class="next"> + + </td> + </tr></table> + <hr /> + </div> + + + + <span class="path" dir="ltr"><a href="index.html">FOSSEE_Communication_Systems_Toolbox</a> >> <a href="section_1f049b1e3111e3d1d538e7603f77f589.html">FOSSEE_Communication_Systems_Toolbox</a> > ssbdemod</span> + + <br /><br /> + <div class="refnamediv"><h1 class="refname">ssbdemod</h1> + <p class="refpurpose">This function performs Single Side Band Amplitude Demodulation</p></div> + + +<div class="refsection"><h3 class="title">Description</h3> + <p class="para">Z = SSBDEMOD(Y,Fc,Fs) +demodulates the single sideband amplitude modulated signal Y +with the carrier frequency Fc (Hz). +Sample frequency Fs (Hz). zero initial phase (ini_phase). +The modulated signal can be an upper or lower sideband signal. +A lowpass butterworth filter is used in the demodulation.</p> + <p class="para">Z = SSBDEMOD(Y,Fc,Fs,INI_PHASE) +adds an extra argument the initial phase (rad) of the modulated signal.</p> + <p class="para">Z = SSBDEMOD(Y,Fc,Fs,INI_PHASE,NUM,DEN) +adds extra arguments about the filter specifications +i.e., the numerator and denominator of the lowpass filter.</p> + <p class="para">Fs must satisfy Fs >2*(Fc + BW), where BW is the bandwidth of the +modulating signal.</p> + <p class="para"></p> + <p class="para"></p></div> + +<div class="refsection"><h3 class="title">Examples</h3> + <div class="programlisting"><table border="0" width="100%"><tr><td width="98%"><pre class="scilabcode"><span class="scilabid">Fs</span> <span class="scilaboperator">=</span><span class="scilabnumber">200</span><span class="scilabdefault">;</span> +<span class="scilabid">t</span> <span class="scilaboperator">=</span> <span class="scilabopenclose">[</span><span class="scilabnumber">0</span><span class="scilabspecial">:</span><span class="scilabnumber">2</span><span class="scilaboperator">*</span><span class="scilabid">Fs</span><span class="scilaboperator">+</span><span class="scilabnumber">1</span><span class="scilabopenclose">]</span><span class="scilaboperator">'</span><span class="scilaboperator">/</span><span class="scilabid">Fs</span><span class="scilabdefault">;</span> +<span class="scilabid">ini_phase</span> <span class="scilaboperator">=</span> <span class="scilabnumber">5</span><span class="scilabdefault">;</span> +<span class="scilabid">Fc</span> <span class="scilaboperator">=</span> <span class="scilabnumber">20</span><span class="scilabdefault">;</span> +<span class="scilabid">fm1</span><span class="scilaboperator">=</span> <span class="scilabnumber">2</span><span class="scilabdefault">;</span> +<span class="scilabid">fm2</span><span class="scilaboperator">=</span> <span class="scilabnumber">3</span> +<span class="scilabid">x</span> <span class="scilaboperator">=</span><a class="scilabcommand" href="scilab://sin">sin</a><span class="scilabopenclose">(</span><span class="scilabnumber">2</span><span class="scilaboperator">*</span><span class="scilabid">fm1</span><span class="scilaboperator">*</span><span class="scilabconstants">%pi</span><span class="scilaboperator">*</span><span class="scilabid">t</span><span class="scilabopenclose">)</span><span class="scilaboperator">+</span><a class="scilabcommand" href="scilab://sin">sin</a><span class="scilabopenclose">(</span><span class="scilabnumber">2</span><span class="scilaboperator">*</span><span class="scilabid">fm2</span><span class="scilaboperator">*</span><span class="scilabconstants">%pi</span><span class="scilaboperator">*</span><span class="scilabid">t</span><span class="scilabopenclose">)</span><span class="scilabdefault">;</span> +<span class="scilabid">y</span> <span class="scilaboperator">=</span> <span class="scilabid">ssbmod</span><span class="scilabopenclose">(</span><span class="scilabid">x</span><span class="scilabdefault">,</span><span class="scilabid">Fc</span><span class="scilabdefault">,</span><span class="scilabid">Fs</span><span class="scilabdefault">,</span><span class="scilabid">ini_phase</span><span class="scilabopenclose">)</span><span class="scilabdefault">;</span> +<span class="scilabid">o</span> <span class="scilaboperator">=</span> <span class="scilabid">ssbdemod</span><span class="scilabopenclose">(</span><span class="scilabid">y</span><span class="scilabdefault">,</span><span class="scilabid">Fc</span><span class="scilabdefault">,</span><span class="scilabid">Fs</span><span class="scilabdefault">,</span><span class="scilabid">ini_phase</span><span class="scilabopenclose">)</span><span class="scilabdefault">;</span> +<span class="scilabid">z</span> <span class="scilaboperator">=</span> <a class="scilabcommand" href="scilab://fft">fft</a><span class="scilabopenclose">(</span><span class="scilabid">y</span><span class="scilabopenclose">)</span><span class="scilabdefault">;</span> +<span class="scilabid">zz</span> <span class="scilaboperator">=</span><a class="scilabcommand" href="scilab://abs">abs</a><span class="scilabopenclose">(</span><span class="scilabid">z</span><span class="scilabopenclose">(</span><span class="scilabnumber">1</span><span class="scilabspecial">:</span><a class="scilabcommand" href="scilab://length">length</a><span class="scilabopenclose">(</span><span class="scilabid">z</span><span class="scilabopenclose">)</span><span class="scilaboperator">/</span><span class="scilabnumber">2</span><span class="scilaboperator">+</span><span class="scilabnumber">1</span> <span class="scilabopenclose">)</span><span class="scilabopenclose">)</span><span class="scilabdefault">;</span> +<span class="scilabid">axis</span> <span class="scilaboperator">=</span> <span class="scilabopenclose">(</span><span class="scilabnumber">0</span><span class="scilabspecial">:</span><span class="scilabid">Fs</span><span class="scilaboperator">/</span><a class="scilabcommand" href="scilab://length">length</a><span class="scilabopenclose">(</span><span class="scilabid">zz</span><span class="scilabopenclose">)</span><span class="scilabspecial">:</span><span class="scilabid">Fs</span> <span class="scilaboperator">-</span><span class="scilabopenclose">(</span><span class="scilabid">Fs</span><span class="scilaboperator">/</span><a class="scilabcommand" href="scilab://length">length</a><span class="scilabopenclose">(</span><span class="scilabid">zz</span><span class="scilabopenclose">)</span><span class="scilabopenclose">)</span><span class="scilabopenclose">)</span><span class="scilaboperator">/</span><span class="scilabnumber">2</span><span class="scilabdefault">;</span> + +<a class="scilabcommand" href="scilab://figure">figure</a> +<a class="scilabmacro" href="scilab://subplot">subplot</a><span class="scilabopenclose">(</span><span class="scilabnumber">3</span><span class="scilabdefault">,</span><span class="scilabnumber">1</span><span class="scilabdefault">,</span><span class="scilabnumber">1</span><span class="scilabopenclose">)</span><span class="scilabdefault">;</span> <a class="scilabmacro" href="scilab://plot">plot</a><span class="scilabopenclose">(</span><span class="scilabid">x</span><span class="scilabopenclose">)</span><span class="scilabdefault">;</span> +<a class="scilabmacro" href="scilab://title">title</a><span class="scilabopenclose">(</span><span class="scilabstring">'</span><span class="scilabstring"> Message signal</span><span class="scilabstring">'</span><span class="scilabopenclose">)</span><span class="scilabdefault">;</span> +<a class="scilabmacro" href="scilab://subplot">subplot</a><span class="scilabopenclose">(</span><span class="scilabnumber">3</span><span class="scilabdefault">,</span><span class="scilabnumber">1</span><span class="scilabdefault">,</span><span class="scilabnumber">2</span><span class="scilabopenclose">)</span><span class="scilabdefault">;</span> <a class="scilabmacro" href="scilab://plot">plot</a><span class="scilabopenclose">(</span><span class="scilabid">y</span><span class="scilabopenclose">)</span><span class="scilabdefault">;</span> +<a class="scilabmacro" href="scilab://title">title</a><span class="scilabopenclose">(</span><span class="scilabstring">'</span><span class="scilabstring">Amplitude modulated signal</span><span class="scilabstring">'</span><span class="scilabopenclose">)</span><span class="scilabdefault">;</span> +<a class="scilabmacro" href="scilab://subplot">subplot</a><span class="scilabopenclose">(</span><span class="scilabnumber">3</span><span class="scilabdefault">,</span><span class="scilabnumber">1</span><span class="scilabdefault">,</span><span class="scilabnumber">3</span><span class="scilabopenclose">)</span><span class="scilabdefault">;</span> <a class="scilabmacro" href="scilab://plot">plot</a><span class="scilabopenclose">(</span><span class="scilabid">axis</span><span class="scilabdefault">,</span><span class="scilabid">zz</span><span class="scilabopenclose">)</span><span class="scilabdefault">;</span> +<a class="scilabmacro" href="scilab://title">title</a><span class="scilabopenclose">(</span><span class="scilabstring">'</span><span class="scilabstring">Spectrum of amplitude modulated signal</span><span class="scilabstring">'</span><span class="scilabopenclose">)</span><span class="scilabdefault">;</span> +<span class="scilabid">z1</span> <span class="scilaboperator">=</span><a class="scilabcommand" href="scilab://fft">fft</a><span class="scilabopenclose">(</span><span class="scilabid">o</span><span class="scilabopenclose">)</span><span class="scilabdefault">;</span> +<span class="scilabid">zz1</span> <span class="scilaboperator">=</span><a class="scilabcommand" href="scilab://abs">abs</a><span class="scilabopenclose">(</span><span class="scilabid">z1</span><span class="scilabopenclose">(</span><span class="scilabnumber">1</span><span class="scilabspecial">:</span><a class="scilabcommand" href="scilab://length">length</a><span class="scilabopenclose">(</span><span class="scilabid">z1</span><span class="scilabopenclose">)</span><span class="scilaboperator">/</span><span class="scilabnumber">2</span><span class="scilaboperator">+</span><span class="scilabnumber">1</span> <span class="scilabopenclose">)</span><span class="scilabopenclose">)</span><span class="scilabdefault">;</span> +<span class="scilabid">axis</span> <span class="scilaboperator">=</span> <span class="scilabopenclose">(</span><span class="scilabnumber">0</span><span class="scilabspecial">:</span><span class="scilabid">Fs</span><span class="scilaboperator">/</span><a class="scilabcommand" href="scilab://length">length</a><span class="scilabopenclose">(</span><span class="scilabid">zz1</span><span class="scilabopenclose">)</span><span class="scilabspecial">:</span><span class="scilabid">Fs</span> <span class="scilaboperator">-</span><span class="scilabopenclose">(</span><span class="scilabid">Fs</span><span class="scilaboperator">/</span><a class="scilabcommand" href="scilab://length">length</a><span class="scilabopenclose">(</span><span class="scilabid">zz1</span><span class="scilabopenclose">)</span><span class="scilabopenclose">)</span><span class="scilabopenclose">)</span><span class="scilaboperator">/</span><span class="scilabnumber">2</span><span class="scilabdefault">;</span> +<a class="scilabcommand" href="scilab://figure">figure</a> +<a class="scilabmacro" href="scilab://subplot">subplot</a><span class="scilabopenclose">(</span><span class="scilabnumber">3</span><span class="scilabdefault">,</span><span class="scilabnumber">1</span><span class="scilabdefault">,</span><span class="scilabnumber">1</span><span class="scilabopenclose">)</span><span class="scilabdefault">;</span> <a class="scilabmacro" href="scilab://plot">plot</a><span class="scilabopenclose">(</span><span class="scilabid">y</span><span class="scilabopenclose">)</span><span class="scilabdefault">;</span> +<a class="scilabmacro" href="scilab://title">title</a><span class="scilabopenclose">(</span><span class="scilabstring">'</span><span class="scilabstring"> Modulated signal</span><span class="scilabstring">'</span><span class="scilabopenclose">)</span><span class="scilabdefault">;</span> +<a class="scilabmacro" href="scilab://subplot">subplot</a><span class="scilabopenclose">(</span><span class="scilabnumber">3</span><span class="scilabdefault">,</span><span class="scilabnumber">1</span><span class="scilabdefault">,</span><span class="scilabnumber">2</span><span class="scilabopenclose">)</span><span class="scilabdefault">;</span> <a class="scilabmacro" href="scilab://plot">plot</a><span class="scilabopenclose">(</span><span class="scilabid">o</span><span class="scilabopenclose">)</span><span class="scilabdefault">;</span> +<a class="scilabmacro" href="scilab://title">title</a><span class="scilabopenclose">(</span><span class="scilabstring">'</span><span class="scilabstring">Demodulated signal</span><span class="scilabstring">'</span><span class="scilabopenclose">)</span><span class="scilabdefault">;</span> +<a class="scilabmacro" href="scilab://subplot">subplot</a><span class="scilabopenclose">(</span><span class="scilabnumber">3</span><span class="scilabdefault">,</span><span class="scilabnumber">1</span><span class="scilabdefault">,</span><span class="scilabnumber">3</span><span class="scilabopenclose">)</span><span class="scilabdefault">;</span> <a class="scilabmacro" href="scilab://plot">plot</a><span class="scilabopenclose">(</span><span class="scilabid">axis</span><span class="scilabdefault">,</span><span class="scilabid">zz1</span><span class="scilabopenclose">)</span><span class="scilabdefault">;</span> +<a class="scilabmacro" href="scilab://title">title</a><span class="scilabopenclose">(</span><span class="scilabstring">'</span><span class="scilabstring">Spectrum of Demodulated signal</span><span class="scilabstring">'</span><span class="scilabopenclose">)</span><span class="scilabdefault">;</span></pre></td><td valign="top"><a href="scilab://scilab.execexample/"><img src="ScilabExecute.png" border="0"/></a></td><td valign="top"><a href="scilab://scilab.editexample/"><img src="ScilabEdit.png" border="0"/></a></td><td></td></tr></table></div></div> + +<div class="refsection"><h3 class="title">Authors</h3> + <ul class="itemizedlist"><li class="member">Pola Lakshmi Priyanka, IIT Bombay</li></ul></div> + <br /> + + <div class="manualnavbar"> + <table width="100%"> + <tr><td colspan="3" class="next"><a href="http://bugzilla.scilab.org/enter_bug.cgi?product=Scilab%20software&component=Documentation%20pages" class="ulink">Report an issue</a></td></tr> +<tr> + <td width="30%"> + <span class="previous"><a href="octave_functions.html"><< octave_functions</a></span> + + </td> + <td width="40%" class="center"> + <span class="top"><a href="section_1f049b1e3111e3d1d538e7603f77f589.html">FOSSEE_Communication_Systems_Toolbox</a></span> + + </td> + <td width="30%" class="next"> + + </td> + </tr></table> + <hr /> + </div> + </body> +</html> |