Physical modeling of the phonatory and vocal tract systems has served as a useful tool to study many aspects of speech production. This paper offers a brief review of two specific types of physically-based models. One for simulating the vibration of the vocal folds and another for representing the vocal tract shape in the form of an area function. While much of the technical detail of these mod...

Vocal tremor has been simulated using a high-dimensional discrete vocal fold model. Specifically, respiratory, phonatory, and articulatory tremors have been modeled as instabilities in six parameters of the model. Reported results are consistent with previous knowledge in that respiratory tremor mainly causes amplitude modulation of the voice signal while laryngeal tremor causes both amplitude ...

We present a case of subglottic stenosis involving the glottis with inflammatory destruction of the cricoid cartilage after prolonged endotracheal intubation. Total cricoidectomy and laryngotracheal anastomosis were performed with T-tube placement that was retained for five months postoperatively. After decannulation of the T-tube, the airway was well restored, with good vocal cord opening. Goo...

Rheumatoid arthritis is a destructive autoimmune disease that affects 3% of the adult population. It is characterized by the formation of both articular and extra-articular lesions with predilection for small joints. There are ubiquitous reports on the head and neck manifestations of RA with emphasis on the larynx. The laryngeal presenting features of this systemic disease may mimic a plethora ...

The present study investigates the possible acoustic-articulatory interaction during production of Cantonese plosives at different lexical tones. Using electromagnetic articulography (EMA), movement of the jaw, and upper and lower lips was measured during production of word-initial bilabial plosives at six lexical tones. Preliminary data reveals a strong relationship between aspiration and lip ...

Phonation occurs when vocal fold vibrations are initiated and maintained by an interaction between the respiratory and phonatory systems [1]. The vocal folds must be in good condition for the voice to be satisfactory. Pathological conditions of the vocal folds are associated with voice deterioration. Voice disorders include alterations in vocal fold closure or muscle activation during vocal fol...

Voice source characteristics as derived from inverse filtering were analyzed in 6 country singers' speech and singing. Results showed that the closed quotient varied systematically with vocal loudness, and that glottal compliance (the ratio between transglottal AC volume displacement and subglottal pressure) decreased with increases in fundamental frequency but remained unaffected by vocal loud...