Variación de los parámetros acústicos: f0, Jitter, Shimmer y Alpha ratio en relación con distintos niveles de ruido de fondo

Abstract

Background and objectives

Research involving acoustic analysis does not always consider the level of background noise in the room where the recording process is going to be carried out, or if they do, the maximum value of background noise used varies from author to author. The objective of this research is to establish if the parameters: f₀, Jitter, Shimmer and Alpha ratio vary in relation to different levels of background noise in the room where the recording process is carried out and to establish a maximum value of this.

Materials and methods

The Praat program was used to get the average value of the parameters: f₀, Jitter, Shimmer and Alpha ratio from a voice sample of 33 subjects inside an audiometric booth whose background noise level was 28.1 dB(A). A statistical comparison was made between the average value of each parameter as the background noise increased in relation to the average values obtained with the baseline background noise of the cabin for each parameter.

Results

The f₀ and Alpha ratio parameters show reliable values up to a background noise level of 47.7 dB(A), while the Jitter and Shimmer parameters do so up to a background noise level of 43.8 dB(A).

Conclusions

Considering that the acoustic parameters are all obtained from the same recording, we can point out that the recommended maximum background noise level in the room where the recordings are made should not exceed 43.8 dB(A).