Development of an active cancellation system
Abstract
The requirement for reducing the environmental noise increases as the amount of electrical equipment, either domestical or industrial becomes larger. To solve this problem several active noise cancelling schemes have been developed based on adaptive filters, which generates in a replica of the noise signal with inverse phase which reduce the noise by superposing both acoustic waves, because these systems are able to track the variations of the noise characteristics. These schemes carried out the cancelation in the acoustic domain instead of to do it in the electrical one, consequently must operate in a tridimensional space. This paper presents the development of an acoustic cancelation system in a duct, using FIR adaptive filters to estimate the noise signal as well as the secondary path. Evaluation results in time domain as well as in frequency domain show the proposed system provides an attenuation of at least 20dB when it is required to operate with nonstationary signals such as those produces by motors of trucks, airplanes among others.
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References
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