Design and implementation of a low-cost and portable noise masking system

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Noise pollution has been given more awareness because of its adverse impacts on human health and comfort. The portable low-frequency noise reduction device built in this project can effectively solve low-frequency noise pollution problems using active noise cancellation. Active Noise Cancellation (ANC) technology has been a tremendous challenge in modern science. The main reason for ANC's slow adoption is its higher initial cost compared to passive methods. Thus, considering this, this project seeks to build a costeffective and attractive ANC system to overcome this economic hurdle using essential hardware resources such as microphones, amplifiers, and speakers. ANC technology uses the destructive interference principle of waves to cancel out a signal by superposition with its inverted signal. This capstone report presents the possible results of implementing a cost-effective ANC system to facilitate an enclosure's sound level. Simulations in Proteus and Multisim and hardware testing results reveal that the noise can be decreased by 6 - 17 dB for low frequencies. However, the system attenuated sounds of low frequencies (less than or equal to 1kHz) much better than high frequencies. The noise source position and movement, intensity, and frequency of the noise signal influence these sound effects.
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 Electrical and Electronic Engineering, May 2021
noise cancelling headphones