Speech signal parametrization for speaker recognition under voice disguise conditions

An experiment was performed to find out, if any of commonly applied techniques of speech signal parametrization is particularly resistant to voice disguise. As experimental material three vowels extracted from the word “logarytm” /ORJDUËWP/ spoken 10 times by each of 10 speakers under seven different speaking conditions were used. Three methods of parametrization were tested: FFT, LPC and ZCR. The results of the experiments indicated that the smallest intraspeaker variations were obtained for ZCR parameters, LPC provided reasonably good results, while FFT parameters were very seensitive to voice disguise and provided the worst results. Generally, however, it has to be stated that the experiments performed did not indicate explicitly which method of parametrization is particularly resistant to voice disguise.