17. The electronic device of claim 16 , further comprising: a comparator to receive the posterior distribution of voice activity, to apply a criterion for selecting an optimal sequence based on the posterior distribution of voice activity, and to generate a Voice Activity Detection (VAD) output that indicates whether the acoustic signal includes speech.
17. The electronic device of claim 16 , further comprising: a comparator to receive the posterior distribution of voice activity, to apply a criterion for selecting an optimal sequence based on the posterior distribution of voice activity, and to generate a Voice Activity Detection (VAD) output that indicates whether the acoustic signal includes speech. 20. The electronic device of claim 17 , wherein to generate probabilistic models, the speech features model generator uses chained Dirichlet regularizations to adapt a model complexity to an amount of available training data.