Patent ID: 7454329

Claim:
A method for classifying signals comprising: dividing an input signal into blocks having a predetermined time length; extracting one or more than one characteristic quantities of a signal attribute from the signal of each block; and classifying the signal of each block into a category according to the characteristic quantities thereof, wherein said signal of each block is classified into any of the categories formed on the basis of types structures that signals may have and do not depend on the types of signal sources, and wherein one or more than one of the average and variances of the signal power in the block, the average and variances of the power of a band-pass signal of the signal in the block, the average and variances of the spread of the spectrogram of the signal in the block, the average and variances of the pitch frequency of the signal in the block, the average and variances of the degree of harmonic structurization of the signal in the block, the average and variances of the residue signal of linear predictive analysis of the signal in the block and the average and variances of the pitch gain of the residue signal of linear predictive analysis of the signal in the block are used as said characteristic quantities.