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Inverse Fourier synchrosqueezed transform

`x = ifsst(s)`

`x = ifsst(s,window)`

`x = ifsst(s,window,f,freqrange)`

`x = ifsst(s,window,iridge)`

`x = ifsst(s,window,iridge,'NumFrequencyBins',nbins)`

inverts
the synchrosqueezed transform along the time-frequency ridges specified
by the index vector or matrix `x`

= ifsst(`s`

,`window`

,`iridge`

)`iridge`

. If `iridge`

is
a matrix, then `ifsst`

initially performs the inversion
along the first column of `iridge`

and then proceeds
iteratively along the subsequent columns. The output is a vector or
matrix with the same size as `iridge`

.