Análise dos efeitos dos codecs de áudio na avaliação de desvios vocais

This article presents a study on the implications of different audio codecs on perceptual voice analysis. A VoIP- based transmission scenario was created, using Asterisk and the Microsip softphone, to aid in the diagnosis of distance vocal deviations. Each selected signal was submitted to four transmissions, using a specific codec. Using the EAV scale, before and after each transmission, a speech-language pathologist performed the classification of the signals as rough, breathy or normal. The codecs Speex32 and LPCM16 were able to detect the presence of the deviations with 76% and 88% of Sensitivity, respectively.