Abstract
The present paper describes the experimental investigation of characteristics of adaptive feedforward active control systems of beat noise in ducts. Dual-input, dual-controller and single-output(2-2-1) system has been proposed to improve the performance of the active control. Proposed 2-2-1 system can achieve relatively large attenuation and can converge rapidly in comparison with the conventional single-input, single-controller and single-output system. Results show that the step-size of the 2-2-1 system increases as the frequency separation increases and noise reduction increases as the step-size increases. Results show that the fastest convergence is obtained by the optimum step-size for a given frequency separation and sampling frequency.
