Mercurial > hg > ltpda
diff m-toolbox/html_help/help/ug/resample_content.html @ 0:f0afece42f48
Import.
author | Daniele Nicolodi <nicolodi@science.unitn.it> |
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date | Wed, 23 Nov 2011 19:22:13 +0100 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/m-toolbox/html_help/help/ug/resample_content.html Wed Nov 23 19:22:13 2011 +0100 @@ -0,0 +1,64 @@ +<h2>Description</h2> +<p> + Resampling is the process of changing the sampling rate of data. <a href="matlab:doc('ao/resample')"><tt>Resample</tt></a> + changes the sampling rate of the input AOs to the desired output sampling frequency. LTPDA <a href="matlab:doc('ao/resample')"><tt>resample</tt></a> overloads <tt>resample</tt> function of Matlab Signal Processing Toolbox for AOs. +</p> +<h2>Syntax</h2> +<div class="fragment"><pre> + <br> + b = resample(a, pl) + </pre> +</div> +<h2>Parameters</h2> +<p> The following parameters can be set: + <ul> + <li> <tt>fsout</tt> - specify the desired output frequency (must be positive and integer)</li> + <li> <tt>filter</tt> - specified filter applied to the input, <tt>a</tt>, in the resampling process</li> + </ul> +</p> +<p> + <h2>Examples</h2> +</p> +<p> + 2. Resampling a sequence of random data at original sampling rate of 1 Hz at an output sampling of 50 Hz. +</p> +<div class="fragment"><pre> + <br> + <span class="comment">% create an AO of random data with fs = 10 Hz</span> + pl = plist(<span class="string">'tsfcn'</span>, <span class="string">'randn(size(t))'</span>,<span class="string">'fs'</span>,1,<span class="string">'nsecs'</span>,10,<span class="string">'yunits'</span>,<span class="string">'m'</span>,<span class="string">'nsecs'</span>,100); + x = ao(pl); + y = resample(x, plist(<span class="string">'fsout'</span>, 50)); <span class="comment">% resample the input AO (x) to obtain the resampled output AO (y)</span> + iplot(x, y) <span class="comment">% plot original and resampled data</span> + </pre> +</div> +<br> +<br> +<img src="images/resample1.png" alt="Resample"> +<br> +<br> +<br> +<p> + 1. Resampling a sequence of random data at original sampling rate of 10 Hz at an output sampling of 1 Hz with + a filter defined by the user. +</p> +<div class="fragment"><pre> + <br> + <span class="comment">% create an AO of random data with fs = 10 Hz</span> + pl = plist(<span class="string">'tsfcn'</span>, <span class="string">'randn(size(t))'</span>,<span class="string">'fs'</span>,10,<span class="string">'nsecs'</span>,10,<span class="string">'yunits'</span>,<span class="string">'m'</span>); + x = ao(pl) + + <span class="comment">% filter definition</span> + plfilter = plist(<span class="string">'type'</span>,<span class="string">'lowpass'</span>,<span class="string">'Win'</span>,specwin(<span class="string">'Kaiser'</span>, 10, 150),<span class="string">'order'</span>,32,<span class="string">'fs'</span>,10,<span class="string">'fc'</span>,1); + f = mfir(plfilter) + + <span class="comment">% resampling</span> + pl = plist(<span class="string">'fsout'</span>, 1, <span class="string">'filter'</span>,f); <span class="comment">% define parameters list with fsout = 1 Hz and the defined filter</span> + y = resample(x, pl); <span class="comment">% resample the input AO (x) to obtain the resampled output AO (y)</span> + iplot(x, y) <span class="comment">% plot original and resampled data</span> + </pre> +</div> +<br> +<br> +<img src="images/resample2.png" alt="Resample" border="0"> + +