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Efficient Multiplexing of Voice and Data

Robert A. Crawford
Advisor: Dr. J. W. Sennott
An efficient system for transmitting voice and data on a single channel would be useful in many areas - defense, transportation, and even entertainment. The use of a single channel would reduce the costs of maintenance (phone bills, for example) and equipment. This project involved developing such a system by digitizing the voice, compressing it, and building packets of digitized voice or data.
The goal is a system that's transparent to both the user and the digital system involved. This is done with a "black box" that sits between the computer and its modem. The computer sees the device as merely a slower serial device. Hardware difficulties have prevented the development of a real-time system, but a prototype has been developed. The prototype runs entirely within the DSP processor memory, using sampled voice and text files for its input.

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