DPCM SYSTEM-DESIGN FOR DIVERSITY SYSTEMS WITH APPLICATIONS TO PACKETIZED SPEECH

Speech quality in packetized speech systems can degrade substantially when packets are lost. We consider the problem of DPCM system design f or packetized speech systems. The problem is formulated as a multiple description problem and the problem of optimal selection of the encode r and decoder filters is addressed. We show that significant improveme nts in performance are obtained as compared to an earlier system propo sed by Jayant and Christensen. Further, we show that for a first-order Gauss-Markov source significant performance improvements can be obtai ned by using a second-order predictor instead of a first-order predict or.