Simultaneous measurements of pitch, intensity and air flow have been often carried out for estimation of dysphonias. As phonosurgery to restore normal voice is now popular, such a method for evaluation of voice is absolutely necessary like audiogram in the field of audiology.
We have designed a very versatile and convenient device thanks to up-to-date development of electronics. By use of these instruments, further process like ratio of intensity and air flow or pitch perturbation to flow and intensity is available, and these results will give us an excellent information to laryngologists. On the other hand, it is very important to analyze the pattern itself obtained. We have analyzed simultaneous recordings in patients with polypoid vocal folds and stiff vocal folds including normal cases.
Base on the results obtained, we concluded as follows;
(1) In normal cases, intensity and flow lines in graphical record are almost flat.
(2) In cases with polypoid vocal folds, their lines are gradually declined in course of phonation.
(3) In cases with stiff vocal folds, their lines usually have notches.
These results mentioned above are discussed mainly from the view point of phonodynamics.
