The Effect of Long-Term Use of Drugs on Speaker’s Fundamental Frequency

In this paper we investigate speech recordings before and after speaker’s drug-abuse treatment, and show that there are no statistically significant dependences in distortions of speaker’s fundamental frequency on different groups of drugs and on the degree of drug intoxication. Changes in the fundamental frequency are not regular and have no general nature. The main reason for changing the fundamental frequency is a change of speaker emotional state, rather than drug addiction treatment. Exploring the effect of the duration of narcotic drug usage on the speaker’s fundamental frequency showed that speakers with prolonged use of drugs of the heroin group have a tendency to decrease the fundamental frequency by about 3% per year.