To the Editor.—The article on voice analysis by Berke et al1 in the January 1989 issue of the Archives emphasizes the use of inexpensive computer systems to aid in clinical applications of assessment of voice quality. I would like the authors to respond to the following points.
First, is the trace depicted as a photoglottogram (PGG) in Fig 4 that of an electroglottogram (EGG) and vice versa, for the text description does not relate to the figure shown. Second, that the opening and closing slopes of a PGG are comparatively symmetric in the computer signal derived from a normal male subject is acceptable. However, this so-called symmetry can also be seen in the trace obtained from a patient with recurrent laryngeal nerve paralysis. Also, the authors have not indicated what symmetry stands for. Is it the rise and fall times of each of the upgoing and downgoing segments
RAO AJ. Voice Analysis Revisited. Arch Otolaryngol Head Neck Surg. 1989;115(9):1133. doi:10.1001/archotol.1989.01860330123033
Customize your JAMA Network experience by selecting one or more topics from the list below.
Create a personal account or sign in to: