This thesis investigates an implementation of speech recognition front-end.
It is an application specific integrated circuit (ASIC) solution. A Mel Cepstrum
algorithm is implemented for the feature extraction. We present a new mixed split-radix
and radix-2 Fast Fourier Transform (FFT) algorithm, which can effectively
minimize the number of complex multiplications in the speech recognition front-end.
A prime length discrete cosine transform (DCT) is done effectively through
the use of two shorter length correlations. The algorithm results in a circular
correlation structure that is suitable for a constant coefficient multiplication and
shift-register realization. The multiplicative normalization algorithm is used for
square root function. Radix-2 algorithm is used in the first 5 stages and radix-4
algorithm is used in the other stages to speed up the convergence. A similar
normalization algorithm is present for natural logarithm. / Graduation date: 2002
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/29277 |
| Date | 17 May 2001 |
| Creators | Xiao, Xin |
| Contributors | Lu, Shih-Lien |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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