Active cancellation of noise in acoustic signals
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.
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
noise cancellation device, destructive interference, filters