"James P. Salsman" wrote:
Philips owns the rights to a related but different form of LPC,
from U.S. patent 5,943,646, which was applied for more than four
years after the publication of GSM 06.10 by ETSI. That patent is
most likely what is confusing people about the status.
The patent
Jutta,
Thanks for the information:
The patent I've seen investigated in connection with GSM 06.10
and Philips is the older 4,932,061 (1990)
Interesting. The priority date of that one is 22 March 1985.
The practice of quantizing residual exitation in LPC vocoders was
not novel in 1985.
The question is not if there is any prior art. The question is if any of
the primary claims in the Philips patent cover any aspect of GSM. If not,
it doesn't matter. If so...
U.S. law is peculiar when it comes to patents. You are deemed to be
infringing UNLESS you can prove otherwise TO A
