PASS PHRASE BASED SPEAKER AUTHENTICATION METHOD Russian patent published in 2011 - IPC G10L15/00 G10L17/00 

FIELD: information technology.

SUBSTANCE: input speech signal of a speaker undergoes segment-by-segment comparison with stored standard parameters of standard phrases uttered by speakers known in advance, for which parametric descriptions of successive segments of the input speech signal are compared with parametric descriptions of successive segments from those selected for comparison with said standard with subsequent authentication of the speaker. The parametric descriptions used is a transition matrix, for which is constructed a sequence of special points selected by comparing the reading in the segment with the surrounding of the reading determined through generalised coefficients of linear prediction and a threshold T. Further, the sequences of special points are merged into blocks with length L. A transition matrix similar to the transition matrix in a Markovian chain is constructed based on the number of special points in the block and the obtained matrix is compared with the model of the standard matrix with given accuracy ε and a decision is made on correct authentication of the speaker.

EFFECT: high reliability of speaker recognition when using a pass phrase with a limited length.

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