Speech Technologies by Ivo Ipsic

By Ivo Ipsic

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4 Efficient DFT hardware implementation This section presents an efficient hardware implementation of the previous described overlapping DFT (OvlDFT) algorithm. This algorithm and implementation are subjected to patent (Vu, 2010). Firstly, assuming that the input samples, x (i ), are real, the output of the DFT is symmetric, then as a result, only values k from 0 to N 2 − 1 are required. Also, as described in the previous section, only Xhal f _new is required to be computed. To simplify the formula, the real (XRe ) and imaginary (X Im ) parts of Xhal f _new are computed individually, as presented in equation (12) and (13).

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Speech recognition in noisy environments: A survey, Speech communication 16(3): 261–291. Gradshteyn, I. & Ryzhik, I. (2007). , Alan Jeffrey and Daniel Zwillinger (Editors) - Elsevier Academic Press. Griffiths, L. & Jim, C. (1982). An alternative approach to linearly constrained adaptive beamforming, Antennas Propagation, IEEE Transactions on 30(1): 27–34. Hendriks, R. & Martin, R. (2007). MAP estimators for speech enhancement under normal and Rayleigh inverse Gaussian distributions, Audio, Speech, and Language Processing, IEEE Transactions on 15(3): 918–927.

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