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Master's Dissertation
DOI
https://doi.org/10.11606/D.82.2003.tde-11122003-151819
Document
Author
Full name
Giovana Yuko Nakashima
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2003
Supervisor
Committee
Pereira, Jose Carlos (President)
Pedro, Vanessa Monteiro
Silva, Orivaldo Lopes da
Title in Portuguese
Aplicação do filtro de WIENER para tratamento de sinais eletromiográficos
Keywords in Portuguese
eletromiografia
filtro de wiener
processamento digital de sinais
Abstract in Portuguese
A eletromiografia consiste no estudo do movimentos dos músculos através dos sinais elétricos emitidos pelos mesmos. Esses sinais são captados por meio de eletrodos (de surpefície ou de agulha), sendo muito suscetíveis a variações e interferências não relacionadas diretamente com o movimento muscular (ruídos). Visando obter dados qualitativamente confiáveis, o processamento digital de sinais fornece como ferramentas os filtros ótimos e adaptativos, que são utilizados quando o sinal desajado está contaminado por ruído. Com a finalidade de diminuir o ruído presente no sinal eletromiográfico, foram implementados os filtros de wiener e wiener adaptativo ao algoritmo LMS (least mean square), tendo a análise da relação sinal/ruído dos sinais obtidos demonstrado que não há diferença significativa entre os filtros. Como conclusão, no tratamento de sinais eletromiográficos, pode-se aplicar tanto o filtro de wiener como o de wiener adaptativo, observando-se que este último apresenta a vantagem de consumir menos tempo de processamento.
Title in English
Application of wiener filter to electromyography signals treatment
Keywords in English
digital signal processing
electromyography
wiener filter
Abstract in English
Electromyography is the study of muscle moviments through the electrical signal that they emanate. These signals are detected with eletrodes (surface or needle), where variations and interferences not directly related with movement are present (noises). Digital signal processing provides optimal and adaptative filters with the aim to get qualitative reliable data. The filters are used when desired signal is corrupted by noise. With the purpose of noise reduction in electromyography signal, wiener and adaptative wiener filters (the last one with least mean square algorithm) were implemented. However, signal-to-noise ratio analysis gave evidence that there is no significative difference between both the filters. As conclusion, in electromygraphy signal treatment, wiener and adaptative wiener filters could be used, with the only difference that the last one takes less processing time.
 
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Publishing Date
2003-12-22
 
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