#
HHT MATLAB program
**runcode package
[download]**

The current MATLAB program
of HHT includes the following modules:

1)
eemd.m.
The module that performs EMD/EEMD;

2)
ifndq.m.
The module that calculates an instantaneous frequency for a given
IMF; and

3)
extrema.m.
A supporting module that is used by the previous two modules.

4)
significance.m This is used to obtain the "percenta" line based
on Wu and Huang

(2004).

5)
dist_value.m This is a utility
program being called by "significance.m".

6)
nnspe.m Compute
the Hilbert-Huang Spectrum of energy

7)
significanceIMF

The modules of the program
are suggested to be in a folder (for example folder “EEMD”) under
the MATLAB “toolbox” folder (C:\MATLAB6p5\toolbox\EEMD). By adding
the MATLAB path to that directory, the programs are ready to be
used. Some interface related information is given in each program.
The “help” command can be used to get these information.

The above programs are the
preliminary version of an HHT software. In future, more modules that
provide more features such statistical test, calculation of marginal
spectrum, and visualization in time-frequency-energy domain, will be
added.