THE STUDY OF AN EFFECT OF INTRA-ORAL AIR PRESSURE ON BODY WALL VIBRATION DURING PHONATION

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We physiologically examined body wall vibration to further develop the research in this field. The intensities and power spectra of the vibration of various parts of the human body were measured during sustained phonation. At the same time, voice sound and intra-oral and intra-pharyngeal air pressure were measured to analyze the mechanism of articulation of vowels and consonants. The concentration of acoustic energy around 3 KHz as found on the spectrum of body wall vibrations and singing voice sound. This resonance area was considered to correspond to what Sundberg designated as the "Singing formant". Quantitative analysis was carried out (not published).The relationship between the perceived pitch of whispered vowels and their formant frequencies was studied (Reference 3,5). and perceptual and acoustic studies on articulation after uvulopalatopharyngoplasty were performed (Reference 6). Based on these results, to determine the present status of alaryngeal speech, a retrospective survey of patients who underwent total laryngectomy was carried out by questionnaire. A total of 681 of 971 laryngectomees in the Osaka-Kyoto area responded to the survey. The results revealed that the rate of patients using the electrolarynx increased (Reference 1). We also investigated the morphology of the larynx as a voice source organ by high speed helical CT scanning and evaluated the clinical usefulness and limitations of 3-dimensional (3-D) CT images of the larynx (Reference 2,4).