in many active noise control (anc) applications, an online secondary pathmodelling method that uses a white noise as a training signal is required. this paperproposes a new feedback anc system. here we modified both the fxlms and thevss-lms algorithms to raised noise attenuation and modelling accuracy for theoverall system. the proposed algorithm stops injection of the white noise at theoptimum...

In this paper, we propose a feedback active noise control (ANC) system which can surpress disturbance. The conventional feedback ANC system has a possibility of divergence because the disturbance of broadband noise corrupts the input signal for the system. To surpress the disturbance, we incorporate a linear prediction filter into the feedback ANC system. Simulation results show that the propos...

This paper discusses acoustic feedback effects in active noise control (ANC) and proposes an improved performance online adaptive feedback canceller (AFC). The online AFC is ineffective if the noise input is narrowband. The proposed method uses the prewhitening filter in the weight adaptation path of both AFC and ANC. The computer simulations show that the proposed method of ANC with online AFC...

In many active noise control (ANC) applications, an online secondary path modelling method that uses a white noise as a training signal is required. This paper proposes a new feedback ANC system. Here we modified both the FxLMS and the VSS-LMS algorithms to raised noise attenuation and modelling accuracy for the overall system. The proposed algorithm stops injection of the white noise at the op...

In many active noise control (ANC) applications, an online secondary path modelling method that uses a white noise as a training signal is required. This paper proposes a new feedback ANC system. Here we modified both the FxLMS and the VSS-LMS algorithms to raised noise attenuation and modelling accuracy for the overall system. The proposed algorithm stops injection of the white noise at the op...

This paper presents a novel approach for subband feedback Active Noise Control (ANC). Wideband ANC systems often involve adaptive filters with hundreds of taps. Using subband processing can considerably reduce the length of the adaptive filter. Conventional subband algorithms are generally based in the frequency domain and use at least 2 sensors. This paper presents a time domain algorithm for ...

This paper presents a hybrid active noise canceling (HANC) algorithm to overcome the acoustic feedback present in most ANC system, together with an efficient secondary path estimation scheme. The HANC system provides a solution of two fundamental problems present in these kind of ANC systems: The first consists in a reduction of the acoustic feedback from the cancellation loudspeaker to the inp...

This paper presents a hybrid active noise canceling (HANC) algorithm to overcome the acoustic feedback present in most ANC system, together with an efficient secondary path estimation scheme. The HANC system provides a solution of two fundamental problems present in these kind of ANC systems: The first consists in a reduction of the acoustic feedback from the cancellation loudspeaker to the inp...

Active Noise Control (ANC) systems are developing rapidly because of their improvements in environmental noise reduction. ANC is based on either feedforward or feedback control. Feedback structures are employed in applications that the reference signal is not available. The step size of filters used in ANC systems plays an essential role in performance of the system. Any variation from the appr...

The modelling and simulation of the Active Noise Control (ANC) using the fixed feedback control for a hard-wall one-dimensional acoustic duct system is discussed. The state-space models as well as the transfer function description are derived based on physical principles. The coupled dynamic between the cancelling loudspeaker and the acoustic duct is explicitly expressed in these models. Beside...