Audio Integrated Active Noise Control System with Auto Gain Controller

This paper proposes an audio integrated active noise control (ANC) system with an auto gain controller. An ANC system is one of the techniques for reducing unwanted noise and used to reduce the factory noise, engine noise, and so forth. In general, the ANC system cannot completely reduce the unwanted noise due to its principle. To solve this problem, an audio integrated ANC (AIANC) system has been proposed. The AIANC system uses the additional audio signal to mask the residual noise called error signal. Also, the AIANC system can be used for telecommunication under noisy environment, in which the voice is treated as the audio signal of the AIANC system. However, in the conventional AIANC system, the power of the audio signal cannot be adjusted to that of the error signal and it causes that the audio signal is too larger or smaller than the error signal. To solve this problem, the AIANC with an auto gain controller is proposed. The proposed AIANC system has the auto gain controller to adjust the power of the audio signal and that of the error signal. Then, the audio signal is emitted with the same power as the error signal. Simulation results shows that the proposed AIANC system can reduce the unwanted noise and adjust the power of the audio signal to that of the error signal.