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Accurate representation of time-varying signals using mixed transforms with applications to speech

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2 Author(s)
Mikhael, W.B. ; Dept. of Electr. Eng., West Virginia Univ., Morgantown, WV, USA ; Spanias, A.S.

Basis functions from two transforms, the discrete Fourier transform (DFT) and the Walsh-Hadamard transform are used. An iterative algorithm to implement the mixed representation is developed. A finite number of DFT components, either fixed or variable, is used to represent the selective (narrowband) dominant spectrum of the signal on a frame-by-frame basis. The whitened (broadband) residual signal is represented using a small number of Walsh components. The mixed partial sets are applied to speech representation. Preliminary results and informal listening using this model produced good quality speech

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Circuits and Systems, IEEE Transactions on  (Volume:36 ,  Issue: 2 )