Page "Linear predictive coding" Paragraph 5

According to Robert M. Gray of Stanford University, the first ideas leading to LPC started in 1966 when S. Saito and F. Itakura of NTT described an approach to automatic phoneme discrimination that involved the first maximum likelihood approach to speech coding.

In 1967, John Burg outlined the maximum entropy approach.

In 1969 Itakura and Saito introduced partial correlation, May Glen Culler proposed realtime speech encoding, and B. S. Atal presented an LPC speech coder at the Annual Meeting of the Acoustical Society of America.

In 1971 realtime LPC using 16-bit LPC hardware was demonstrated by Philco-Ford ; four units were sold.