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- W2123901243 abstract "This paper presents a new technique for high-accuracy tracking of vocal-tract resonances (which coincide with formants for nonnasalized vowels) in natural speech. The technique is based on a discretized nonlinear prediction function, which is embedded in a temporal constraint on the quantized input values over adjacent time frames as the prior knowledge for their temporal behavior. The nonlinear prediction is constructed, based on its analytical form derived in detail in this paper, as a parameter-free, discrete mapping function that approximates the “forward” relationship from the resonance frequencies and bandwidths to the Linear Predictive Coding (LPC) cepstra of real speech. Discretization of the function permits the “inversion” of the function via a search operation. We further introduce the nonlinear-prediction residual, characterized by a multivariate Gaussian vector with trainable mean vectors and covariance matrices, to account for the errors due to the functional approximation. We develop and describe an expectation–maximization (EM)-based algorithm for training the parameters of the residual, and a dynamic programming-based algorithm for resonance tracking. Details of the algorithm implementation for computation speedup are provided. Experimental results are presented which demonstrate the effectiveness of our new paradigm for tracking vocal-tract resonances. In particular, we show the effectiveness of training the prediction-residual parameters in obtaining high-accuracy resonance estimates, especially during consonantal closure." @default.
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- W2123901243 date "2006-03-01" @default.
- W2123901243 modified "2023-10-18" @default.
- W2123901243 title "Tracking Vocal Tract Resonances Using a Quantized Nonlinear Function Embedded in a Temporal Constraint" @default.
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- W2123901243 doi "https://doi.org/10.1109/tsa.2005.855841" @default.
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