In this paper we investigate speech recordings before and after speaker’s drug-abuse treatment, and show that there is no statistically significant dependency between distortions of speaker’s fundamental frequency and formants on the one side, and different groups of drugs and on the degree of drug intoxication on the other. Changes of the fundamental frequency are not regular and do not have a general nature. The main reasons for these changes are changes in the emotional state of speakers, rather than a drug addiction treatment.
This paper presents a development of previous research by P.Kenny, which deals with using a supervised PLDA mixture of two gender-dependent speaker verification systems under the conditions of gender uncertainty. We propose using PLDA mixtures for speaker verification in different channels. However, in contrast to creating a gender-independent mixture, the optimal decision for training a channel-independent mixture for two channels in our task was mixing three channel-dependent PLDA systems.