Fundamental frequencies Natural frequencies 11 Humans 8 human 8 voice 8 Speech 7 article 7 Female 6 Voice 6 female 6 physiology 6 Male 5 human experiment 5 male 5 speech 5 Phonation 4 Speech Acoustics 4 adult 4 glottis 4 phonation 4 Acoustics 3 Linguistics 3 Phonetics 3 Power quality 3 Two-dimensional 3 child 3 phonetics 3 vocal cord 3 Acoustic features 2 Adolescent 2