GABREASSIGN Reassign time-frequency distribution
Usage: sr = gabreassign(s,tgrad,fgrad,a);
GABREASSIGN(s,tgrad,fgrad,a) reassigns the values of the positive
time-frequency distribution s using the phase gradient given by fgrad*
and tgrad. The lattice is determined by the time shift a and the
number of channels deduced from the size of s.
fgrad and tgrad can be obtained by the routine GABPHASEGRAD.
Examples:
---------
The following example demonstrates how to manually create a
reassigned spectrogram. An easier way is to just call RESGRAM:
% Create reassigned vector field of the bat signal.
a=4; M=100;
[tgrad, fgrad, c] = gabphasegrad('dgt',bat,'gauss',a,M);
% Perform the actual reassignment
sr = gabreassign(abs(c).^2,tgrad,fgrad,a);
% Display it using plotdgt
plotdgt(sr,a,143000,50);
References:
F. Auger and P. Flandrin. Improving the readability of time-frequency
and time-scale representations by the reassignment method. IEEE Trans.
Signal Process., 43(5):1068--1089, 1995.
Url: http://ltfat.github.io/doc/gabor/gabreassign.html
See also: resgram, gabphasegrad.
Package: ltfat