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Backbone Carrying Capacity Analysis
Today, many options exist as to the types of switching and multiplexing usable on carrier backbones. As the Williams Communications Group (WCG) is rapidly laying fiber in anticipation of reentering the market and offering a full slate of communications services, a critical unbiased analysis is urgently needed as to which technique promises to offer the best service for the lowest cost. In cooperation with WCG engineers, Oklahoma State University will analyze a selection of backbone connectivity techniques and rank order these in terms of their estimated ability to offer high quality, reliable, and low cost services.
Sponsor:
Williams Communications Group
FS-1016 4800 bps CELP Improvements and Integerization
Federal Standard 1016 Code Excited Linear Predictor (CELP) is a low bit rate speech coding algorithm that was adopted as a standard in 1991. The primary use of CELP has been in military applications but in recent years has become quite popular in a variety of applications where low bit rate digital speech communication is desired such as digital answering machines, cellular voice communications, and satellite communications. The goal of this project is to investigate and evaluate potential enhancements to FS-1016 4,800 bit per second (bps) CELP. Specifically, a goal of this project is the development of a CELP research coder incorporating numerous algorithmic enhancements while maintaining compatibility and interoperability with the current Federal Standard. Potential improvements to CELP include enhancements to speech naturalness and intelligibility and reduction in algorithmic complexity. Also, in parallel is the development of a corresponding fixed-point CELP research coder capable of simulating various common digital signal processing (DSP) architectures.
Sponsor:
Department of Defense
Mid-Rate Excitation Speech Coding Algorithm
Mid-Rate Excitation Speech Coding Algorithm In recent years, research in the area of speech coding has led to the development of a number of improved speech analysis models. One speech model, which has been particularly successful, is MultiBand Excitation (MBE). This speech model has shown to be of high quality and intelligibility at low bit rates, i.e. 2,400 bits per second (BPS). The goals of this project are separated into two stages. The first stage is the development and implementation of a baseline MBE simulation for nominal 8,000 BPS high quality coding of speech. The second stage will be the investigation and evaluation of potential enhancements to the baseline MBE speech coder development of stage 1. Potential improvements include quality increases, intelligibility increases, and complexity decreases. Mid-rate speech coders have many applications in the area of digital speech communication, for example: cellular voice communications and satellite communications.
Sponsors: Department of Defense