Investigating an Active Noise Cancellation System for Reducing the Sound of Car Horns in an Enclosed Cavity

Active Noise Cancellation (ANC) technology has been a tremendous challenge in modern science. This technology uses the basic interference principle of waves to cancel out a signal by superposition with its inverted signal. This paper presents the possible results of implementing an ANC system to reduce the sound level of car horns inside the room of a patient in a hospital in Bangladesh. The entire project was initially modelled using a designed wooden cavity in place of the desired room. After attempting the work using Analog methods, the researchers decided to explore digital solutions by designing a Digital Signal Processing (DSP) unit in MATLAB and Simulink. All real world signals were used which were captured using microphones. And speakers were used to generate noise and anti-noise for the modelled system.