Análise de técnicas de cancelamento ativo de ruído

Abstract

The vast majority of humanity suffers or has already suffered noise disturbances in their daily life, and thus, at high amplitudes, this sound may imply significant damage to the hearing aid of the affected. Due to this fact, it is imperative that research developed with the intention of canceling or attenuating this type of disorder occurs. The growing study in the area of signal processing has been instrumental in assisting the development of control techniques capable of annulling this noise actively through the principle of wave overlap and destructive interference. The main objective of this study is to analyze with the application of different types of algorithms the noise cancellation techniques through the Active noise control by feedback and feedforward method. It is important to analyze the peculiarities of each algorithm applied in the active noise control, in order to obtain a better noise reduction system, since in applications that require a more stable system the operating cost will be higher, requiring the algorithm NLMS. However, in simple applications the LMS algorithm will normally act with a considerably low error value and a low level of complexity in the system.