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Advisor(s)
Abstract(s)
Este trabalho propõe uma melhoria no método de cancelamento de realimentação acústica baseado no cepstro do sinal de erro. Essa melhoria consiste em um algoritmo para transformar o fator de esquecimento, parâmetro que controla o compromisso entre robustez a perturbações de curta duração e capacidade de rastreamento do filtro adaptativo, em variante no tempo. Simulações demonstraram que esse algoritmo faz o método apresentar um melhor compromisso entre velocidade de (re-)convergência e limite de desalinhamento, aumentando de modo geral a margem de estabilidade do sistema de sonorização.
This work proposes an improvement in the acoustic feedback cancellation method based on the cepstrum of the error signal. This improvement consists of an algorithm to transform the forgetting factor, parameter that controls the trade-off between robustness to short-burst disturbances and tracking rate of the adaptive filter, into time-varying. Simulations showed that this algorithm makes the method present a better trade-off between (re-)convergence speed and misalignment limit, generally increasing the stability margin of the sound reinforcement system.
This work proposes an improvement in the acoustic feedback cancellation method based on the cepstrum of the error signal. This improvement consists of an algorithm to transform the forgetting factor, parameter that controls the trade-off between robustness to short-burst disturbances and tracking rate of the adaptive filter, into time-varying. Simulations showed that this algorithm makes the method present a better trade-off between (re-)convergence speed and misalignment limit, generally increasing the stability margin of the sound reinforcement system.
Description
Keywords
Cancelamento de realimentação acústica Método cepstral Fator de esquecimento Acoustic feedback cancellation Cepstrum-based method Forgetting factor