Patent ID: 6801895
Filing Date: 2004-10-05
Classification: G10L

Abstract:
A method of classifying an audio stream comprising:(a) receiving an said audio stream (b) sampling said audio stream at a predetermined rate; (c) combining a predetermined number of samples into a clip; (d) determining a plurality of features of said clip; (e) analyzing said several features of said clip using a linear approximation algorithm; and (f) characterizing said clip based upon said analysis with said linear approximation algorithm; wherein step (d) comprises the sub-steps of: (i) determining the non silence ratio of said clip; (ii) determining the standard deviation of the zero crossing rate of said (iii) determining the volume standard deviation of said clip; (iv) determining the volume dynamic range of said clip; (v) determining the volume undulation of said clip; (vi) determining the 4 Hz modulation energy of said clip; (vii) determining the smooth pitch ratio of said clip; (viii) determining the non-pitch ratio of said clip; and (ix) determining the energy ratio in the sub-band of said clip.