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Audio dereverberation using binary masks

Grant number: 20/16363-9
Support type:Scholarships in Brazil - Master
Effective date (Start): February 01, 2021
Effective date (End): October 31, 2022
Field of knowledge:Engineering - Electrical Engineering - Telecommunications
Principal researcher:Bruno Sanches Masiero
Grantee:Pedro Otávio de Oliveira
Home Institution: Faculdade de Engenharia Elétrica e de Computação (FEEC). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil
Associated research grant:17/08120-6 - 3D-Audio. Sampling, encoding and reproduction of spatial audio, AP.JP


The quantity and direction of sound sources in an acoustic scene can be done, at first, using spatial filters to estimate the sound level reaching an array of microphones from different directions, in a similar way to the estimation of acoustic images. This technique, however, usually has low resolution due to the relatively small number of microphones that make up the array. An alternative to increase the quality acoustic image, without increasing the number of sensors, is the use of sparsity-promoting regularization. However, if we apply these sparsity-promoting algorithms to a sound scene with only a few sources, but recorded in a very reverberant environment, the results will not be as encouraging, since for these algorithms reverberation will reduce the sparseness of the sound scene. To improve the separation of sound objects in these conditions, we propose the use of an information enhancement step, which discards information that is superfluous for our perception, in this case, the reverberation. The aim of this project is to develop a enhancement algorithm based on the concept of a binary mask to perform the reverberation of signals acquired with spherical microphone arrangements.It is expected that at the end of this project, the candidate will have developed a functional algorithm for the reverberation of the signals acquired with a spherical microphone arrangement. (AU)

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