This thesis presents a study of several algorithms for enhancing speech
degraded by additive noise in mobile cellular communications. The primary goal of
this multi-stage study was to examine adaptive noise cancellation techniques in
which one microphone is used to measure the speech plus noise signal and another
microphone is used to form an estimate of the interfering background noise.
The first stage of this research project involved the design and operation of a
measurement system to gather dual channel audio samples in mobile radio
environments for use in testing adaptive noise cancellation algorithms developed at
Northeastern University. In the second phase of this research, several adaptive
algorithms were used to implement noise cancellation systems which were applied
to the measured speech signals. In the third phase of this research, several of the
adaptive noise cancellation algorithms are compared and additional speech
enhancement techniques are investigated.
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