4. The method in claim 3 , wherein the posterior distribution voice activity is estimated from an entire past history in real-time of a speech state given a latency.
4. The method in claim 3 , wherein the posterior distribution voice activity is estimated from an entire past history in real-time of a speech state given a latency. 5. The method of claim 4 , further comprising: receiving by a comparator the posterior distribution of voice activity; applying a criterion for selecting an optimal sequence based on the posterior distribution of voice activity; and generating a Voice Activity Detection (VAD) output that indicates whether the acoustic signal includes speech.