Laryngograph as a tool in diagnosis and therapy of voice disorders

The electroglottography method is an instrumental analysis by the device called Laryngograph, which can be practically applied in the speech signal analysis for people with voice disorders issues. In this paper capabilities of this device are estimated. A very interesting fact is that visualization of the speech signal obtained with the use of Laryngograph device allows to detect the acoustically and phonetically most important features and present them in a graphical form. The research show that Laryngograph can a very efficient tool in such domains as: speech therapy (in order to improve speech process); clinical examination of nose and throat (to diagnose work of vocal folds, e.g., after surgical procedures); improvement of the voice of singers and announcers; examination of relations between speech and work of vocal cords; teaching foreign languages. The experimental research presented in this paper concerns also the evaluation and the development of oral ability of deaf children. The obtained results and following practical conclusions can serve as guidelines in clinical and logopedical applications in voice rehabilitation and communication development of groups of children with hearing impairments. Key-Words: electroglottography method, Laryngograph, speech signal analysis, voice disorders, voice profile, vocal cords irregularity