A Vibroacoustic Model of Selected Human Larynx Diseases

Abstract

With the present development of digital registration and methods for processing speech it is possible to make effective objective acoustic diagnostics for medical purposes. These methods are useful as all pathologies and diseases of the human vocal tract influence the quality of a patient's speech signal. Diagnostics of the voice organ can be defined as an unambiguous recognition of the current condition of a specific voice source. Such recognition is based on an evaluation of essential acoustic parameters of the speech signal. This requires creating a vibroacoustic model of selected deformations of Polish speech in relation to specific human larynx diseases. An analysis of speech and parameter mapping in 29-dimensional space is reviewed in this study. Speech parameters were extracted in time, frequency and cepstral (quefrency) domains resulting in diagrams that qualified symptoms and conditions of selected human larynx diseases. The paper presents graphically selected human larynx diseases.speech analysis pathological speech surgical treatment

Reduction of Speech Signal Deformation in Patients after Nasal Septum Surgery (Septolplasty)

“…Polish speech pattern (control group) was created by recording and analyzing samples of normal speech collected from non-vocally trained healthy men and women without any pathology which may affect the voice color. Described pattern has already been used as a reference for other studies [2,3].…”

“…The applied in research phonetic test (presented in Table I) was arranged and proposed by the group of otolaryngologists and phoniatrist experts. The same test was used in earlier authors' research [2,3]. The selection of sounds and groups of words uttered by the examined persons has been based on morphological and functional analysis of the expected (for a given pathology type) dysfunction of speech organs.…”

“…where n -identification number -according to the data base of patients, M 0 -M [2,4], S -shimmer, denotes an amplitude deviation of the basic tone -in consecutive periods [2,4]. In the measurement of speech signals distances from the signal pattern Euclidean, weighted Euclidean, Hamming and weighted Hamming metrics were used.…”

Analysis of Polish Pathological Speech by Higher Order Spectrum

“…In addition, it is estimated that half of the number of people complaining of dysphonia suffer from hypertrophy changes on their vocal folds, such as laryngeal polypus, Reinke's oedema, vocal cord nodules, laryngeal papillomatosis, coccus and contact ulcer. Nearly 60% of all malignant diseases localized in the area of the head and neck are laryngeal cancers [8].…”

“…It had been used in earlier research of authors [8,9]. A recording of sound pressure time waveforms, p(t), of a speech signal was made in the anechoic chamber of the Department of Mechanics and Vibroacoustics, AGH University of Science and Technology, and in a room for hearing examinations and audiometric measurements of the Chair and Clinic of Otolaryngology, CM UJ.…”