Use este identificador para citar ou linkar para este item: http://repositorio.ufla.br/jspui/handle/1/42434
Título: Speech quality classifier model based on DBN that considers atmospheric phenomena
Palavras-chave: Wireless communications
Speech quality
Atmospheric phenomena
Rain
Atmospheric gases
Comunicações sem fio
Voz - Qualidade
Fenômenos atmosféricos
Chuva
Gases atmosféricos
Data do documento: Mar-2020
Editor: University of Split, FESB
Citação: SILVA, M. J. da et al. Speech quality classifier model based on DBN that considers atmospheric phenomena. Journal of Communications Software and Systems, Split, v. 16, n. 1, p. 75-84, Mar. 2020. DOI: http://dx.doi.org/10.24138/jcomss.v16i1.1033.
Resumo: Current implementations of 5G networks consider higher frequency range of operation than previous telecommunication networks, and it is possible to offer higher data rates for different applications. On the other hand, atmospheric phenomena could have a more negative impact on the transmission quality. Thus, the study of the transmitted signal quality at high frequencies is relevant to guaranty the user ́s quality of experience. In this research, the recommendations ITU-R P.838-3 and ITU-R P.676-11 are implemented in a network scenario, which are methodologies to estimate the signal degradations originated by rainfall and atmospheric gases, respectively. Thus, speech signals are encoded by the AMR-WB codec, transmitted and the perceptual speech quality is evaluated using the algorithm described in ITU-T Rec. P.863, mostly known as POLQA. The novelty of this work is to propose a non-intrusive speech quality classifier that considers atmospheric phenomena. This classifier is based on Deep Belief Networks (DBN) that uses Support Vector Machine (SVM) with radial basis function kernel (RBF-SVM) as classifier, to identify five predefined speech quality classes. Experimental Results show that the proposed speech quality classifier reached an accuracy between 92% and 95% for each quality class overcoming the results obtained by the sole non-intrusive standard described in ITU-T Recommendation P.563. Furthermore, subjective tests are carried out to validate the proposed classifier performance, and it reached an accuracy of 94.8%.
URI: http://repositorio.ufla.br/jspui/handle/1/42434
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