Page "Linear predictive coding" Paragraph 6

In 1972 Bob Kahn of ARPA, with Jim Forgie ( Lincoln Laboratory, LL ) and Dave Walden ( BBN Technologies ), started the first developments in packetized speech, which would eventually lead to Voice over IP technology.

In 1973, according to Lincoln Laboratory informal history, the first realtime 2400 bit / s LPC was implemented by Ed Hofstetter.

In 1974 the first realtime two-way LPC packet speech communication was accomplished over the ARPANET at 3500 bit / s between Culler-Harrison and Lincoln Laboratories.

In 1976 the first LPC conference took place over the ARPANET using the Network Voice Protocol, between Culler-Harrison, ISI, SRI, and LL at 3500 bit / s.

And finally in 1978, Vishwanath et al.

of BBN developed the first variable-rate LPC algorithm.