Voice acoustic analysis in ENT practice

Due to the fact that the oscillogram is not subjected to any additional numerical processing, it is the only one in the source form. Consequently, it contains all available information about the speech signal. Unfortunately, due to this "oversaturation" with information, its analysis is complicated and must be based mainly on experience. The oscillogram should not, however, be ignored, but should be used as a "final instance" to verify problematic results of other analyzes. Fig. 1 shows examples of oscillograms for the speech signal of a healthy person and a person with diagnosed pathology.

a)

b)

Fig. 1. Sample oscillograms: a) healthy person's speech; b) pathological speech

Oscillograms can be analyzed long-term (sentences), but mainly they are data for short-term analysis (even single basic periods).

Interpreting oscillograms

On the oscillogram, first of all, the similarity of the neighboring periods should be observed - their length, amplitude, shape of the oscillation. In addition, the amount of noise can be roughly determined by observing the characteristic tearing of the graph.