Patent ID: 8155953

Claim:
A voice discrimination apparatus including a processor for determining whether an input sound signal corresponds to a voice region or a non-voice region, comprising: a domain transform unit, controlled by the processor, for transforming an input sound signal frame into a frame in the frequency domain; a dimensional spatial transform unit for linearly transforming the domain of the transformed frame to reduce a dimension of the transformed frame; a model training/update unit for setting a voice model and a plurality of noise models in the linearly transformed domain, and initializing or updating the voice model and the noise models; a speech absence probability (SAP) computation unit for obtaining an SAP computation equation for each of a plurality of simultaneous noise sources by using the initialized or updated voice model and noise models and substituting the transformed frame into each equation to compute the SAP for each noise source; a noise source selection unit for selecting a noise source having a minimum SAP from among the plurality of noise sources by comparing the SAPs computed for each of the plurality of noise sources; and a voice judgment unit for judging whether the input frame corresponds to the voice region in accordance with the SAP level of the selected noise source; wherein the dimensional spatial transform unit creates a derivative frame and linearly transforms an integrated frame configured by combining the transformed frame and the derivative frame.