Method and Device for Active Acoustic Noise Cancellation Processes

This paper first discusses the problems that arise in the propagation of acoustic waves and on factors that actively cancel unwanted acoustic waves. It focuses also on the insurmountable obstacles that arise in the physical realization of devices meant to perform that. Some of the current approaches employed to address the aforementioned issues are discussed. Active noise cancellation (ANC) systems are electronic devices that use a loudspeaker to deliver a different wave in order to attenuate unwanted acoustic noise waves until both are cancelled. Because the controlled acoustic noise wave propagation process is highly unstable (can change anytime noise wave properties, noise wave source position, or listener), we currently use adaptive control systems to solve these problems. We cannot use a standard PID controller because it must adjust its parameters to unknown or changing processes, which entails further challenges. Additionally, we suggest a previously mentioned approach to gain a deeper understanding of controlled processes, which might potentially replace adaptive control. The technique involves determining the wavefront shape, which is then used to determine the wavefront shape of acoustic noise through propagation. This will lessen the unidentified controlled process. The synthesized anti-noise wave will reproduce a similar wavefront shape like noise wave.