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+++ b/m-toolbox/html_help/help/ug/sigproc_spec_content.html	Wed Nov 23 19:22:13 2011 +0100
@@ -0,0 +1,18 @@
+<p>
+  Spectral estimation is a branch of the signal processing, performed on data
+  and based on frequency-domain techniques.<br>
+  Within the LTPDA toolbox many functions of the Matlab <a href="matlab:doc('signal')" >Signal Processing Toolbox</a>
+  (which is required) were rewritten to operate on LTPDA Analysis Objects.
+  Univariate and multivariate technique are available, so to estimate for example the linear
+  power spectral density or the cross spectral density of one or more signals. The focus of the
+  tools is on time-series objects, whose spectral content needs to be estimated.<br>
+  More detailed help on spectral estimation can also be found in the help associated with
+  the Signal Processing Toolbox:
+<table cellspacing="0" class="note" summary="Note" cellpadding="5" border="1">
+    <tr width="90%">
+      <td>
+       >> doc signal
+      </td>
+    </tr>
+  </table>
+</p>