Patent ID: 7072833
Filing Date: 2006-07-04
Classification: G10L

Abstract:
1. An apparatus for detecting the presence of speech within an input audio signal, comprising: a memory for storing a predetermined function which gives, for a given set of audio signal values, a probability density for parameters of a predetermined speech model which is assumed to have generated the set of audio signal values, the probability density defining, for a given set of model parameter values, the probability that the predetermined speech model has those parameter values, given that the speech model is assumed to have generated the set of audio signal values; means for receiving a set of audio signal values representative of an input audio signal; means for applying the set of received audio signal values to said stored function to give the probability density for said model parameters for the set of received audio signal values; means for processing said function with said set of received audio signal values applied to obtain values of said parameters that are representative of said input audio signal; and means for detecting the presence of speech using said obtained parameter values.