Patent ID: 7080008

Claim:
A method comprising: separating at least a portion of an audio signal into a plurality of frames; extracting line spectrum pairs from each of the plurality of frames; and using at least the line spectrum pairs to classify at least the portion as either speech or non-speech, wherein the using comprises: generating an input Gaussian Model corresponding to the plurality of frames based on the extracted line spectrum pairs; identifying one of a plurality of trained Gaussian Models that is closest to the input Gaussian Model; determining a distance between the input Gaussian Model and the closest trained Gaussian Model; and classifying at least the portion as non-speech if the distance is greater than a first threshold value; determining an energy distribution of the plurality of frames in a first bandwidth; and classifying at least the portion as non-speech if the distance is greater than a second threshold value and the energy distribution of the plurality of frames in the first bandwidth is less than a third threshold value, wherein the second threshold value is less than the first threshold value.