Performance evaluation of nonlinear speech enhancement based on virtual increase of channels in reverberant environments

Kouei Yamaoka, Shoji Makino, Nobutaka Ono, Takeshi Yamada

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

In this paper, we evaluate the performance of a maximum signal-to-noise ratio beamformer based on a virtual increase of channels. We previously proposed a new microphone array signal processing technique, which virtually increases the number of microphones by generating extra signal channels from two real microphone signals. This technique generates a virtual observation on the assumption that the sources are W-disjoint orthogonal, which means that only one source is dominant in one time-frequency bin. However, mixed signals with a long reverberation tend to dissatisfy this assumption. In this study, we conducted experiments in a variety of reverberant environments, as well as computer simulation using image method. As a result, we confirmed that our technique contributes improving the performance in reverberant environments. We also confirmed that the longer the reverberation time, the smaller the increase in the improvement using our technique. Moreover, we present directivity patterns to confirm the behavior of a virtual increase of channels.

Original languageEnglish
Title of host publication25th European Signal Processing Conference, EUSIPCO 2017
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages2324-2328
Number of pages5
ISBN (Electronic)9780992862671
DOIs
Publication statusPublished - 2017 Oct 23
Externally publishedYes
Event25th European Signal Processing Conference, EUSIPCO 2017 - Kos, Greece
Duration: 2017 Aug 282017 Sep 2

Publication series

Name25th European Signal Processing Conference, EUSIPCO 2017
Volume2017-January

Conference

Conference25th European Signal Processing Conference, EUSIPCO 2017
CountryGreece
CityKos
Period17/8/2817/9/2

ASJC Scopus subject areas

  • Signal Processing

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