Practical Biomedical Signal Analysis Using MATLAB

100 Practical Biomedical Signal Analysis Using MATLAB

R



varies topographicaly. Hence atom g

γ

k

can be expressed as:

g

γ

k

= argmax

g

γ

∈D

n

∑

i=1

|R

n

x

i

,g

i

γ

|

2

and ∀

i, j

g

i

γ

= g

j

γ

(3.53)

Another example of optimality criterion can be formulated when the multivariate

signal is obtained as an ensemble of realization of a process, e.g., multiple epochs

containing the realizations of an evoked potential. In such a case the criterion could

be analogous to the one given by (equation 3.53), but the constraint of the same phase

for all univariate atoms can be relaxed.