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The Use Of Companding In Conferencing Voice Communications Systems, Jon P. Klages
The Use Of Companding In Conferencing Voice Communications Systems, Jon P. Klages
Retrospective Theses and Dissertations
Compounded codes are used for representing voice data in digital communication systems. This thesis addresses the use of the Mu-law companding algorithm in a system optimized for conferencing. A procedure for determining the degree of compression for a variable number of conferees and design equations for implementing a table-lookup scheme using read-only-memories are presented.
Digital Communications System Evaluation: Design Developments In Pseudorandom Sequence Usage, Signal Conditioning And Timing Regeneration, Barry Lane
Retrospective Theses and Dissertations
The aim of this paper is to develop a series of designs which allow evaluation of several digital communication system design concepts. Circuits were developed and tested which deal with three central areas of concern in digital communication networks. They include random signal generation and detection, signal conditioning, and digital timing extraction. A pseudorandom sequence generator and correlator design form the basic digital channel. Bi-phase transmission coding and digital timing regeneration were later added to the initial channel. System performance was confirmed by inserting errors and measuring error rate.