Acoustics Fundamental frequencies 2 Humans 2 Speech 2 article human 2 physiology 2 Child speech 1 Child, Preschool 1 Co-articulation 1 Drag 1 Female 1 Good correlations 1 Linguistics 1 Male 1 Measurements of 1 Models, Biological 1 Phonation 1 Phonetics 1 Physics 1 Second harmonics 1 Sound production 1 Source characterization 1 Speech Acoustics 1 Speech Production Measurement 1 Standard deviation 1 Surrogate measures 1 Time Factors 1 Trachea 1 Transducers 1