Aplicação de técnicas de realce de voz e máscaras acústicas para aprimoramento das comunicações por voz no telefone submarino

Abstract

This paper presents a study focused on the application of enhancement methods and acoustic masks, generally used in airborne acoustics, to improve the perceptual aspects of speech in an underwater acoustic telephone. For this analysis, an own speech database was developed with words used among the ships of the Brazilian Navy, with native portuguese speakers. Two experimental scenarios were proposed, both corrupted by two distinct acoustic noises. In the first, speech signals were corrupted only with ambient noise, and the OMLSA and UMMSE enhancement methods were evaluated by a quality (SegSNR) and intelligibility (ESII) measure. In the second, the effect of reverberation was included, con- sidering six reverberant scenarios, and the previous methods, in addition to ideal (IRM) and blind (BRM) acoustic mask, were evaluated by the SRMR measure. In both experimental scenarios, OMLSA showed better results when compared to blind solutions.