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Full-Text Articles in Physical Sciences and Mathematics
Environmental Acoustic Transfer Functions And Filtering Acoustic Signals, Brandon P. Dias
Environmental Acoustic Transfer Functions And Filtering Acoustic Signals, Brandon P. Dias
Theses and Dissertations
Signal processing is the method of taking a given signal and extracting useful information, usually by a means of a transformation of some kind. Acoustic signals are functions of time in which the output is a pressure or a velocity potential response. An acoustic signal is affected by the environment in which it propagates, so one can attempt to remove the environmental effects to extract the useful information, in this case the original signal. This thesis will derive, in a mathematical framework, the process of filtering extraneous signals in a way that yields the original signal, and will then apply …
Noise Estimation In The Presence Of Bpsk Digital Burst Transmissions, Susan E. Bettison
Noise Estimation In The Presence Of Bpsk Digital Burst Transmissions, Susan E. Bettison
Theses and Dissertations
This research explores noise estimation techniques in an attempt to improve upon a previously developed digital burst transmission Binary Phase Shift Keyed (BPSK) demodulator. The demodulator success is dependent on the accuracy of the estimate of Power Spectral Density (PSD) of the unknown noise. Given a discrete time signal transformed into the frequency domain, the research seeks to determine if it is possible to effectively estimate the PSD of the unknown noise. The demodulator was developed using a new signal model for digital burst transmissions based on linear spectral subspace theory. Using this model and the redundancy properties of BPSK …