THE EFFECT OF NOISE ON THE SPECTRUM OF SPEECH
| Author: |
Parikh, Gaurang Kishor |
| Advisor: |
Philip Loizou |
| URL: |
http://www.utdallas.edu/~loizou/thesis/gaurang_ms_thesis.pdf
" target="_blank"> http://www.utdallas.edu/~loizou/thesis/gaurang_ms_thesis.pdf
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| Completion Date: |
August 2002 |
| Degree: |
M.Sc./M.A. |
| Institution: |
University of Texas at Dallas |
| Abstract: |
Real world noise is mostly colored and does not affect the speech signal uniformly over the entire spectrum. Little is known about the effect of noise on the spectrum of speech. Such knowledge could potentially help us develop better speech enhancement algorithms. This thesis investigates the affect of colored noise viz. multi-talker babble and speech-shaped noise on the spectrum of vowels and consonants. Multi-talker babble and speech-shaped noise were added to vowels and stop consonants at -5 to 15 dB SNR and the spectral effect of noise was quantified in terms of various acoustic measures: (a) spectral contrast of the noisy vowel spectra, (b) spectral distance between the noisy and clean vowel and consonant spectra for three frequency bands, (c) detection and estimation of first two formant frequencies in noise, (d) frequency deviation of first two formant frequencies in noise, (e) spectral tilt of stop consonants, and (f) burst frequency for the stop consonants. Results showed that for vowels and stop consonants, the effect of colored noise on the frequency spectrum was non-uniform. |
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