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Master's Dissertation
DOI
Document
Author
Full name
Flávio Conde
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2010
Supervisor
Committee
Burt, Phillip Mark Seymour (President)
Biscainho, Luiz Wagner Pereira
Nascimento, Vítor Heloiz
Title in Portuguese
Redes de microfones em tempo real: uma implementação com hardware de baixo custo e software de código aberto. 
Keywords in Portuguese
Microfones
Processamento digital de sinais
Software livre e Linux
Abstract in Portuguese
Este trabalho apresenta a implementação prática de uma rede de microfones para ser utilizada em tempo real. A solução proposta envolve o uso de hardware de baixo custo e software de código aberto. Em termos de hardware, a rede de microfones utilizou dispositivos de áudio USB conectados diretamente a um computador pessoal (PC). Em termos de software, foram utilizados a biblioteca de código aberto Advanced Linux Sound Architecture (ALSA) e o sistema operacional Linux. Algumas implementações foram realizadas na biblioteca ALSA para que fosse possível a utilização da rede de microfones dentro do Linux. Os algoritmos implementados na biblioteca ALSA foram o Delay and Sum, Generalized Sidelobe Canceller (GSC) e o Post-Filtering. Os aspectos teóricos dos principais algoritmos empregados nas redes de microfones foram abordados de forma extensa. Os resultados teóricos e práticos desta implementação são apresentados no final deste trabalho. Todo o desenvolvimento de software foi publicado na Internet para que sirva de base para futuros trabalhos.
Title in English
Real time microphone arrays: a low-cost implementation with open source code.
Keywords in English
Digital signal processing
Free software and Linux
Microphones
Abstract in English
This work presents the practical implementation of a microphone array to be used in real time. The proposed solution involves the use of low-cost hardware and open source software. In terms of hardware, the microphone array used USB audio devices connected directly to a personal computer (PC). In terms of software, it was used the open-source library Advanced Linux Sound Architecture (ALSA) and Linux operating system. Some implementations were carried out in ALSA library to make it possible to use the microphone array within Linux. The algorithms implemented in ALSA library were the Delay and Sum, Generalized Sidelobe Canceller (GSC) and Post-Filtering. The theory of the main algorithms used in microphone array were discussed extensively. The results for the theoretical and practical implementation are presented at the end of this work. All software development was published on the Internet to serve as a basis for future works.
 
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Publishing Date
2010-09-01
 
WARNING: The material described below relates to works resulting from this thesis or dissertation. The contents of these works are the author's responsibility.
  • CONDE, F., and Burt, Phillip M. S. Real-time microphone arrays: a low-cost implementation with open source code. In IASTED Signal Processing, Pattern Recognition and Applications, Insbruck, 2010. Proceedings IASTED Signal Processing, Pattern Recognition and Applications., 2010.
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