Kalman Predictive Encoder.
A. J. Goldberg, A. Arcese, McAndrew,Thomas, R.W.L. Cheung, Richard L. Freudberg · Defense Technical Information Center (DTIC) · 1975
This study and implementation effort has resulted in a number of significant accomplishments in developing speech compression algorithms and hardware. These include the development of hardware and software for the full duplex 9600 bps residual speech encoder.