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NSGABFRAMEDIAG - Diagonal of Gabor frame operator

Usage

d=nsgabframediag(g,a,M);

Input parameters

g Window function.
a Length of time shift.
M Number of channels.

Output parameters

d Diagonal stored as a column vector

Description

nsgabframediag(g,a,M) computes the diagonal of the non-stationary Gabor frame operator with respect to the window g and parameters a and M. The diagonal is stored as a column vector of length L=sum(a).

The diagonal of the frame operator can for instance be used as a preconditioner.