Archives of Acoustics, 32, 4(S), pp. 143-150, 2007

The acoustic and electroglottographic methods of determination the vocal folds vibration fundamental frequency

Wiesław Wszołek
AGH University of Science and Technology, Department of Mechanics and Vibroacoustics, Al. Mickiewicza 30, 30-059 Kraków
Poland

Maciej Kłaczyński
AGH University of Science and Technology, Department of Mechanics and Vibroacoustics, Al. Mickiewicza 30, 30-059 Kraków
Poland

Zbigniew Engel
AGH University of Science and Technology, Department of Mechanics and Vibroacoustics, Al. Mickiewicza 30, 30-059 Kraków
Poland

There are many methods of measuring fundamental frequency of vocal folds’ vibrations.
The mentioned function can be estimated in several ways, either through internal measurements
(optical methods) or external measurements (the acoustic analysis of the voice, electric
method). Electric methods (EGG), based on analysis of the electroglottographic signal are often
applied. However acoustic methods or registration and processing the speech signals can
be applied. The authors’ research proves that maximum information on phonetic action of larynx
can be assembled by delimitation of the fundamental frequency parameters. Thus the exact
determination of pitch function makes a priority in the glottal area research. The spectrum
character of speech wave is connected with the fundamental frequency ($F_0$) of human vocal
folds vibration. As it is considered, $F_0$ of the source during voicing contains an abundance of
information on the larynx pathology, individual trait, the emotional state and ethnographical
origin of speaker. The literature demonstrates only limited research that conducted simultaneous
measurement of fundamental frequency by the EGG and with the acoustics methods. The
present paper presents results of such research, including simultaneous processing EGG and
acoustic data. The analysis of the $F_0$ function exactitude and the usefulness of these methods
were executed too.
Keywords: speech analysis, speech recognition, pitch determination, electroglottographic signal.
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