An Efficient Solution to Sparse Linear Prediction Analysis of Speech

Abstract : We propose an efficient closed-form solution to the problem of sparse linear prediction analysis of the speech signal. Our method is based on minimization of a weighted l2-norm of the prediction error. The weighting function is constructed such that less emphasis is given to the error around the points where we expect the largest prediction errors to occur (the glottal closure instants) and hence the resulting cost function approaches the ideal l0-norm cost function for sparse residual recovery. We show that the minimization of such a mathematically tractable objective function (by solving normal equations of linear least squares problem) provides enhanced sparsity level of residuals compared to the l1-norm minimization approach which uses the computationally demanding convex optimization methods. Indeed, the computational complexity of the proposed method is roughly the same as the classic minimum variance linear prediction analysis approach. Moreover, to show a potential application of such sparse representation, we use the resulting linear prediction coefficients inside a multi-pulse coder and show that the resulting coder achieves better coding quality compared to the classical Multi-pulse Excitation coder which uses the traditional minimum variance synthesizer.
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https://hal.inria.fr/hal-00709168
Contributor : Vahid Khanagha <>
Submitted on : Monday, June 18, 2012 - 9:52:39 AM
Last modification on : Wednesday, November 29, 2017 - 3:10:35 PM

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Vahid Khanagha, Khalid Daoudi. An Efficient Solution to Sparse Linear Prediction Analysis of Speech. EURASIP Journal on Audio, Speech, and Music Processing, SpringerOpen, 2013, 3, ⟨10.1186/1687-4722-2013-3⟩. ⟨hal-00709168⟩

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