Implementação de um método de cancelamento de realimentação acústica em sistemas de sonorização em tempo real

Abstract

Acoustic feedback is a problem that occurs in sound reinforcement system due to the acoustic coupling between a microphone and a loudspeaker may cause the loudspeaker signal to be picked up by the microphone and return into the system, causing the Larsen effect. Among the approaches to solve this problem, stands out the acoustic feedback cancellation methods. However, as shown in this work, traditional adaptive filtering algorithms does not work in this application. Currently, the most promising solution is the acoustic feedback cancellation methods based on the cepstral analysis of the error signal. This work studies the characteristics of this method through its implementation and evaluation in simulation environment, using MATLAB software. It then, the method was implemented in the C programming language in simulation environment, because the functions created were later used in real-time environment testing, using code developed in C++ object-oriented programming language.