and communication theory.In addition to the above, this JOURNAL ON SELECTED AREAS IN COMMUNICATIONS contains articles pertaining to analog and digital signal processing and modulation, audio and video encoding techniques, the theory and design of transmitters, receivers, and repeaters for communications via optical and sonic media, the design and analysis of computer communications systems, and the development of communication software.Contributions of theory enhancing the understanding of communication systems and techniques are included, as are discussions of the social implications of the development of communication technology.For membership and subscription information and pricing, please visit www.