margtfr

Purpose

Marginals and energy of a time-frequency representation.

Synopsis

[margt,margf,E] = margtfr(tfr)
[margt,margf,E] = margtfr(tfr,t)
[margt,margf,E] = margtfr(tfr,t,f)

Description

margtfr calculates the time and frequency marginals and the energy of a time-frequency representation. The definitions used for the computation are the following:

$$\begin{eqnarray*} m_f(t)=\int_{-\infty}^{+\infty} \mbox{tfr}(t,f)\ df && \mbox{\... ...{-\infty}^{+\infty} \mbox{tfr}(t,f)\ df\ dt && \mbox{\it energy} \end{eqnarray*}$$

Name	Description	Default value
tfr	time-frequency representation (M,N)
t	vector containing the time samples in sec.	(1:N)
f	vector containing the frequency samples in Hz, not necessary uniformly sampled	(1:M)
margt	time marginal
margf	frequency marginal
E	energy of tfr

Example

         S=amgauss(128).*fmlin(128); 
         [tfr,t,f]=tfrscalo(S,1:128,8,.05,.45,128,1);
         [margt,margf,E] = margtfr(tfr); 
         subplot(211); plot(t,margt); 
         subplot(212); plot(f,margf);

See Also

momttfr, momftfr.

© GdR ISIS - Contact