The France Telecom patent was used to threaten MBROLA(Multi Band Resynthesis Overlap Add), with the result that it was made non-free.
http://cygwin.dp.ua/pub/mirrors/www.gnu.org/patent-examp/patent-examples.html#MBROLA
"Thierry Dutoit":
France Telecom's patent on PSOLA (a well-known speech synthesis technique) : US 005327498
Our own patent on MBROLA : US 005987413
There is a third patent on similar thechniques, owned by Philips : EP 0527527 A2
This is the European version of the France Telecom patent: EP 363 233 (B1)
This is the Canadian patent: C 1 324 670
