Active cancellation of noise in acoustic signals
Date
2020-05
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Abstract
In the acoustic domain, sources of noise can be derived from music, vibration from an
engine or a person shouting. There has been a rise in different technologies to combat the
problem of noise. Passive techniques such as using soundproof materials have been
developed, however they pose the challenge of weight from the bulky materials used. Active
noise cancellation techniques although requiring complex computation, can cancel noise up
to 50 decibels (dB), depending on the efficiency of the technology or algorithm used. In this
project, an active noise cancellation device which has the capability of cancelling
surrounding sound has been built using the filtered NLMS algorithm in a digital signal
processor to create a region of silence. It is based on the principle of Destructive
Interference. It is a more affordable rendition of existing products on the market which
incorporate these same principles.
Description
Capstone Project submitted to the Department of Engineering, Ashesi University in partial fulfillment of the requirements for the award of Bachelor of Science degree in Computer Engineering, May 2020
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Applied project
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Keywords
noise cancellation device, destructive interference, filters