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Adaptive Beamforming Using a Microphone Array for Hands-Free Telephony
| Content Provider | Semantic Scholar |
|---|---|
| Author | Campbell, David K. |
| Copyright Year | 1999 |
| Abstract | This thesis describes the design and implementation of a 4-channel microphone array that is an adaptive beamformer used for hands-free telephony in a noisy environment. The microphone signals are amplified, then sent to an A/D converter. The microprocessor board takes the data from the 4 channels and utilizes digital signal processing to determine the direction-of-arrival of the sources and create an output which ‘steers’ the microphone array to the desired look direction while trying to minimize the energy of interference sources and noise. All of the processing for this thesis will be done on a computer using MATLAB. The MUSIC algorithm is used for direction finding in this thesis. It is shown to be effective in estimating direction-of-arrival for 1 speech source and 2 speech sources that are spaced fairly apart, with significant results down to a -5 dB SNR even. The MUSIC algorithm requires knowledge of the number of sources a priori, requiring an estimator for the number of sources. Though proposed estimators for the number of |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://my.fit.edu/~vkepuska/ece5525/MicrophoneArray/etd.pdf |
| Alternate Webpage(s) | http://scholar.lib.vt.edu/theses/available/etd-022099-122645/unrestricted/etd.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
