NORMALIZATION OF SPEAKER INDIVIDUAL CHARACTERISTICS AND COMPENSATION OF LINEAR TRANSMISSION DISTORTIONS IN COMMAND RECOGNITION SYSTEMS
Paweł Mrówka, Ryszard A. Makowski · Archives of Acoustics · 2008
The article presents a novel method of speaker individual characteristics normalization and linear transmission distortion compensation aimed at improving the effectiveness of short isolated utterances recognition. To achieve this goal, spectral transformation banks of a speaker’s signal and the division of speakers into classes were applied. The article also discusses the form of spectral transformation, the method of its parameter values optimization, the method of transformation banks definition, the method of speaker classes selection and the way of iterative improvement of recognition results. Moreover, the study puts forward a fast method of speaker classes selection on the basis of the fundamental voice frequency. The efficiency of the proposed solution has been validated by the recognition results obtained by means of four versions of a recognition system using Hidden Markov Models (HMM) and the mel frequency cepstral coefficients (MFCC) parametrization.