[Octave-cvsupdate] SF.net SVN: octave:[5611] trunk/octave-forge/main/signal

[<gnu...@us...>]

Revision: 5611
          http://octave.svn.sourceforge.net/octave/?rev=5611&view=rev
Author:   gnumuthu
Date:     2009-03-16 07:16:40 +0000 (Mon, 16 Mar 2009)

Log Message:
-----------
sampled2continuous.m : new function that implements simple low-pass filter type reconstruction of uniformly sampled signals

Modified Paths:
--------------
    trunk/octave-forge/main/signal/INDEX

Added Paths:
-----------
    trunk/octave-forge/main/signal/inst/sampled2continuous.m

Modified: trunk/octave-forge/main/signal/INDEX
===================================================================
--- trunk/octave-forge/main/signal/INDEX	2009-03-13 09:33:49 UTC (rev 5610)
+++ trunk/octave-forge/main/signal/INDEX	2009-03-16 07:16:40 UTC (rev 5611)
@@ -172,4 +172,4 @@
  wkeep
  wrev
  zerocrossing
-
+ sampled2continuous

Added: trunk/octave-forge/main/signal/inst/sampled2continuous.m
===================================================================
--- trunk/octave-forge/main/signal/inst/sampled2continuous.m	                        (rev 0)
+++ trunk/octave-forge/main/signal/inst/sampled2continuous.m	2009-03-16 07:16:40 UTC (rev 5611)
@@ -0,0 +1,43 @@
+%% Copyright (C) 2009 Muthiah Annamalai <mut...@gm...>
+%%
+%% This program is free software; you can redistribute it and/or
+%% modify it under the terms of the GNU General Public License
+%% as published by the Free Software Foundation; either version 2,
+%% or (at your option) any later version.
+%%
+%% This program is distributed in the hope that it will be useful,
+%% but WITHOUT ANY WARRANTY; without even the implied warranty of
+%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+%% GNU General Public License for more details.
+%%
+%% You should have received a copy of the GNU General Public License
+%% along with this program; If not, see <http://www.gnu.org/licenses/>.
+
+## Usage:
+## 
+## xt = sampled2continuous( xn , T, t )
+## 
+## Calculate the x(t) reconstructed
+## from samples x[n] sampled at a rate 1/T samples
+## per unit time.
+## 
+## t is all the instants of time when you need x(t) 
+## from x[n]; this time is relative to x[0] and not
+## an absolute time.
+## 
+## This function can be used to calculate sampling rate
+## effects on aliasing, actual signal reconstruction
+## from discrete samples.
+## 
+function xt = sampled2continuous( xn , T, t )
+  if ( nargin < 3 )
+    print_usage()
+  endif
+  
+  N = length( xn );
+  xn = reshape( xn, N, 1 );
+  [TT,tt]= meshgrid(T*(0:N-1)',t);
+  S = sinc((tt -TT)./T);
+  xt = S*xn;
+  return
+end


Property changes on: trunk/octave-forge/main/signal/inst/sampled2continuous.m
___________________________________________________________________
Added: svn:executable
   + *


This was sent by the SourceForge.net collaborative development platform, the world's largest Open Source development site.