Analysis of Acoustic Feedback Cancellation Systems based on Direct Closed-Loop Identification

Acoustic Feedback Cancellation For Public Address Systems

Cyclic Spectra Based Approach to Direct Closed-Loop Identification

The direct closed-loop identification algorithm in frequency domain is considered in this paper. It is shown that the input and output signals obtained through the over-sampling technique have cyclic spectra, which give the frequency transfer function of the over-sampled model. Then a cyclic spectra based identification algorithm is implemented in the frequency domain. It is clarified that the ...

Closed Loop Identification Based on Quantization

This paper proposes a new closed-loop identification scheme for a singleinput-single-output control loop. It is based upon a quantizer inserted into the feedback path. The quantizer can be used to generate an equivalent persistently exciting signal with which the well known two-stage and/or two-step method can be used directly. Simulation examples and an experimental demonstration are used to i...

Cumulant - Based Identification of Noisy Closed Loop Systems

Conventional parameter estimation approaches fail to identify linear systems operating in closed loop when both input and output measurements are contaminated by additive noise of unknown (cross)spectral characteristics. However, even in the absence of measurement noise, parameter estimation is involved owing to the additive system noise entering the loop. The present work introduces a novel cr...

Closed Loop Identification of Nonlinear Systems 1

In recent years, several new methods for the identiication of approximate models of an open loop plant on the basis of closed loop data have been presented. In this paper, we extend two of these methods to the nonlinear case: we consider that both the plant and the controller can be nonlinear. The rst method is a two-step procedure. The sensitivity function of the closed loop system is identiie...