EvolutiveFFT

Generates the evolutive Fourier spectrogram of a signal, and returns it for use in <code>FTGramImage</code>.

Builds on the EMD package to provide additional tools for empirical mode decomposition (EMD) and Hilbert spectral analysis. It also implements the ensemble empirical decomposition (EEMD) and the complete ensemble empirical mode decomposition (CEEMD) methods to avoid mode mixing and intermittency problems found in EMD analysis.  The package comes with several plotting methods that can be used to view intrinsic mode functions, the HHT spectrum, and the Fourier spectrum.

Daniel C Bowman

The Hilbert-Huang Transform: Tools and Methods

Daniel C. Bowman

Jonathan M. Lees

EvolutiveFFT function

<dl> <dt>sig</dt>
<dd>Signal to analyze.</dd> <dt>dt</dt>
<dd>Sample rate (must be constant).</dd> <dt>ft</dt>
<dd>Fourier transform input parameters<ul>
<li>ft$nfft The frequency resolution, should be in powers of 2</li>
<li>ft$ns Number of samples in a window</li>
<li>ft$nov Number of samples to overlap, must be less than <code>ft$ns</code></li>
</ul>
</dd> <dt>freq.span</dt>
<dd>Frequency range to return.</dd> <dt>taper</dt>
<dd>Amount of cosine taper to apply.</dd></dl>

Arguments

Daniel C. Bowman <a href="/link/danny.c.bowman%40gmail.com?package=hht&version=2.1.6" data-mini-rdoc="hht::danny.c.bowman@gmail.com">danny.c.bowman@gmail.com</a>, Jonathan M. Lees

Author

Calculate the evolutive Fourier spectrogram. — EvolutiveFFT

<dl>

 <dt>sig</dt>
<dd>Signal to analyze.</dd>

 <dt>dt</dt>
<dd>Sample rate (must be constant).</dd>

 <dt>ft</dt>
<dd>Fourier transform input parameters<ul>
<li>ft$nfft The frequency resolution, should be in powers of 2</li>
<li>ft$ns Number of samples in a window</li>
<li>ft$nov Number of samples to overlap, must be less than <code>ft$ns</code></li>
</ul>
</dd>

 <dt>freq.span</dt>
<dd>Frequency range to return.</dd>

 <dt>taper</dt>
<dd>Amount of cosine taper to apply.</dd>

</dl>

Daniel C. Bowman <a href='mailto:danny.c.bowman@gmail.com'>danny.c.bowman@gmail.com</a>, Jonathan M. Lees

EvolutiveFFT: Calculate the evolutive Fourier spectrogram.

Description

Usage

Value

Arguments

Author

Details

References