M. Tech. Electronic Engineering. / Monitoring manufacturing plants, military surveillance or enhancing audio signals in a noisy environment are few of the many applications that can benefit from acoustic signal localization. The objective of the project is to design a system that is able to locate an acoustic source using a linear array of omni-directional microphones. The signal outputs of the array are fed into a PC, which processes the data, using a MATLAB-based program. The acoustic source is considered to be unique and stationery. The location of the source will be done by determining the Direction of Arrival (DOA) of the audio signal. This research does not tackle the issue of determining the distance between the source and the array of microphones. "Beamforming" methods are implemented to determine the DOA. The conventional "beamforming" method was compared with higher resolution techniques such as adaptive filtering. Computer simulations of the algorithms were performed, followed by practical experiments. A Field Programmable Gate Array (FPGA) was used to enable a real time acquisition of signals from an array of microphones and the communication interface to the PC was accomplished via the USB interface. The results show that the system can detect the direction of arrival properly and provide the user with lower signal to noise ratio (SNR) reconstructed signals.
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:tut/oai:encore.tut.ac.za:d1000264 |
| Date | January 2008 |
| Creators | Mukwevho, Tshilidzi Gladstone. |
| Contributors | Jordaan, J. A., Noel, Guillaume Pierre Alexandre. |
| Source Sets | South African National ETD Portal |
| Language | English |
| Detected Language | English |
| Type | Thesis |
| Format | |
| Rights | ©2008 Tshwane University of Technology |
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