atoms

Purpose

Linear combination of elementary Gaussian atoms.

Synopsis

[sig,locatoms] = atoms(N)
[sig,locatoms] = atoms(N,coord)

Description

atoms generates a signal consisting in a linear combination of elementary gaussian atoms. The locations of the time-frequency centers of the different atoms are either fixed by the input parameter coord or successively defined by clicking with the mouse (if nargin==1), with the help of a menu.

Name	Description	Default value
N	number of points of the signal
coord	matrix of time-frequency centers, of the form [t1,f1,T1,A1;...;tM,fM,TM,AM]. (ti,fi) are the time-frequency coordinates of atom i, Ti is its time duration and Ai its amplitude. Frequencies f1..fM should be between 0 and 0.5. If nargin==1, the location of the atoms will be defined by clicking with the mouse	Ti=N/4, Ai=1.
sig	output signal
locatoms	matrix of time-frequency coordinates and durations of the atoms

When the selection of the atoms is finished (after clicking on the 'Stop' buttom, or after having specified the coordinates at the command line with the input parameter coord), the signal in time together with a schematic representation of the atoms in the time-frequency plane are displayed on the current figure.

Examples

         sig=atoms(128);
         sig=atoms(128,[32,0.3,32,1;56,0.15,48,1.22;102,0.41,20,0.7]);

See Also

amgauss, fmconst.

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