Resonant Frequencies and Damping Constants of Vocal Resonators
Don Lewis, Curtis Tuthill · The Journal of the Acoustical Society of America · 1938
In a recent paper by Lewis, a method was developed for determining the resonance frequencies and damping constants of the principal resonators typically involved in the production of sustained vocal tones. The method has been used in further research; and the present report deals with data secured on the vowels “O” and “AH”. Generalized values are presented. In addition, some of the effects on vowel structure of variations in pitch and loudness level are shown. It is evident, for example, that the magnitude of high frequency components, relative to the magnitude of low frequency components, varies with loudness level. The effects of pitch variation are, on the whole, neither clear-cut nor consistent.