Date of Award

Summer 1975

Document Type

Thesis - Restricted

Degree Name

Master of Science (MS)


Biomedical Engineering

First Advisor

Niederjohn, Russell J.

Second Advisor

Heinen, James A.

Third Advisor

Lade, Robert W.


The development and testing of an automatic system for tracking the first three formant frequencies is described. The method used involves both a frequency-domain analysis and time domain analysis. A rough frequency domain analysis is performed with a bank of fixed bandpass filters. The amplitude of the signal in each filter is then measured. In addition, an accurate time-domain analysis is performed utilizing a measure of axis crossing intervals in each filter. The acquired data is then used in a computer algorithm to determine the formant frequencies. Description and operation of all hardware and software components is included. The technique uses a minicomputer system, making it relatively inexpensive to implement as compared to more sophisticated formant tracking systems. This system also has the potential for real time application because of its parallel analysis method.



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