I think the codes are here about enseignement which is Teaching, not Contributions as Google Translate proposes.
However, I cannot find exactly the file
sousech.m which can be French.
I think change.m is nowadays mean_change.m.
AR_change.m is also missing.
I got now also answer from the author.
He said that most codes are in the page above.
The author is fluent in English.
I also asked for the missing files.
- sousech.m is some extra file
- AR_change.m have changed into ARMA_change.m
This work is his old stuff so he could not provide exact answers, he said.
Still, the challenge is when some papers refer to his paper, I should be able to reproduce the effects.
So better answer is also welcome who knows more about this.
About time-frequency stuff, he says that rather go to here.