Information Processing Techniques Program. Volume II. Communications-Adaptive Internetting.

摘要

The goal of this program is the investigation and development of techniques for communications-adaptive internetting with particular emphasis on digital voice communications. The specific class of problems addressed relates to packet speech networks whose interconnecting links may be stressed as a result of traffic overloads or are time varying due to natural or hostile actions. This program extends the technology of fixed-topology packet-switching speech communications networks by introducing techniques for adapting both source encoder algorithms and network utilization strategies to the time-varying character of the links in an attempt to provide sustained voice communications capability under adverse conditions. The major accomplishments of the past nine months are: (A) Variable-Data-Rate Protocols for C2 Links, (B) Demonstration System for Packetized Voice over a Single-User Link with Time-Varying Capacity, (C) Adaptive Variable-Rate Modem with 'No-Cost' Up-Probing, (D) Adaptive Voice Communication on an Integrated, Time-Varying Network.