gridrec.html

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<html><head><title>R: Reconstruction from a Ridge</title>
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<table width="100%" summary="page for gridrec {Rwave}"><tr><td>gridrec {Rwave}</td><td align="right">R Documentation</td></tr></table>
<h2>Reconstruction from a Ridge</h2>


<h3>Description</h3>

<p>
Reconstructs signal from sample of a ridge, in the Gabor case.
</p>


<h3>Usage</h3>

<pre>
gridrec(gtinput, node, phinode, nvoice, freqstep, scale, Qinv,
epsilon, np, real=FALSE, check=FALSE)
</pre>


<h3>Arguments</h3>

<table summary="R argblock">
<tr valign="top"><td><code>gtinput</code></td>
<td>
Gabor transform, output of <code><a href="cgt.html">cgt</a></code>.
</td></tr>
<tr valign="top"><td><code>node</code></td>
<td>
time coordinates of the ridge samples.
</td></tr>
<tr valign="top"><td><code>phinode</code></td>
<td>
frequency coordinates of the ridge samples.
</td></tr>
<tr valign="top"><td><code>nvoice</code></td>
<td>
number of different frequencies.
</td></tr>
<tr valign="top"><td><code>freqstep</code></td>
<td>
sampling rate for the frequency axis.
</td></tr>
<tr valign="top"><td><code>scale</code></td>
<td>
scale of the window.
</td></tr>
<tr valign="top"><td><code>Qinv</code></td>
<td>
inverse of the matrix <i>Q</i> of the quadratic form.
</td></tr>
<tr valign="top"><td><code>epsilon</code></td>
<td>
coefficient of the <i>Q_2</i> term in reconstruction kernel
</td></tr>
<tr valign="top"><td><code>np</code></td>
<td>
number of samples of the reconstructed signal.
</td></tr>
<tr valign="top"><td><code>real</code></td>
<td>
if set to TRUE, uses only constraints on the real part
of the transform.
</td></tr>
<tr valign="top"><td><code>check</code></td>
<td>
if set to TRUE, computes <code><a href="cgt.html">cgt</a></code> of
reconstructed signal.
</td></tr>
</table>

<h3>Details</h3>




<h3>Value</h3>

<p>
Returns a list containing the reconstructed signal and the chained ridges.
</p>
<table summary="R argblock">
<tr valign="top"><td><code>sol</code></td>
<td>
reconstruction from a ridge.
</td></tr>
<tr valign="top"><td><code>A</code></td>
<td>
&lt;gaborlets,dualgaborlets&gt; matrix.
</td></tr>
<tr valign="top"><td><code>lam</code></td>
<td>
coefficients of dual gaborlets in reconstructed signal.
</td></tr>
<tr valign="top"><td><code>dualwave</code></td>
<td>
array containing the dual gaborlets.
</td></tr>
<tr valign="top"><td><code>gaborets</code></td>
<td>
array of gaborlets located on the ridge samples.
</td></tr>
<tr valign="top"><td><code>solskel</code></td>
<td>
Gabor transform of sol, restricted to the ridge.
</td></tr>
<tr valign="top"><td><code>inputskel</code></td>
<td>
Gabor transform of signal, restricted to the ridge.
</td></tr>
</table>

<h3>References</h3>

<p>
See discussions in the text of ``Practical Time-Frequency Analysis''.
</p>


<h3>See Also</h3>

<p>
<code><a href="sridrec.html">sridrec</a></code>, <code><a href="gregrec.html">gregrec</a></code>, <code><a href="regrec.html">regrec</a></code>,
<code><a href="regrec2.html">regrec2</a></code>.
</p>



<hr><div align="center">[Package <em>Rwave</em> version 1.24 <a href="00Index.html">Index]</a></div>

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