A numerically stable, finite memory, fast array recursive least squares filter for broadband active noise control

A numerically stable, finite memory, fast array recursive least squares filter for broadband active noise control

van Ophem, S.
Berkhoff, A.P.

2016

Summary For broadband active noise control applications with a rapidly changing primary path, it is desirable to find algorithms with a rapid convergence, a fast tracking performance, and a low computational cost. Recently, a promising algorithm has been presented, called the fast-array Kalman filter, which uses rotation matrices to calculate the filter parameters. However, when this algorithm is implemented, it can show unstable behavior because of finite precision error propagation. In this paper, a novel algorithm is presented, which exhibits the fast convergence and tracking properties and the linear calculation complexity of the fast-array Kalman filter but does not suffer from the mentioned numerical problems. This is accomplished by running two finite length growing memory recursive least squares filters in parallel and using a convex combination of the two filters when the control signal is calculated. A reset of the filter parameters with proper re-initialization is enforced periodically. The mixing parameters will be chosen in such a way that the total available information used for the calculation of the control signal will be approximately equal at every time instance. The performance of the filter is shown in numerical simulations and real-time lab experiments. The numerical experiments show that the algorithm performs better numerically than the fast-array sliding window recursive least squares filter, while achieving a comparable convergence rate and tracking performance. The real-time lab experiments confirm the behavior shown in the simulations. Copyright © 2015 John Wiley & Sons, Ltd.

Observation, Weapon & Protection Systems
AS - Acoustics & Sonar
TS - Technical Sciences
High Tech Systems & Materials
Acoustics and Audiology
Industrial Innovation
active noise control
primary path tracking
recursive least squares
round-off errors
Acoustic variables control
Algorithms
Kalman filters
Computational costs
Convex combinations
Numerical experiments
Primary path
Recursive least square (RLS)
Round-off errors
Tracking performance
Tracking properties
Active noise control

http://resolver.tudelft.nl/uuid:9fdc000c-0251-4ba3-b9ef-9612cda01b65

https://doi.org/10.1002/acs.2574

531362

0890-6327

International Journal of Adaptive Control and Signal Processing, 30 (1), 31-45

Published online 20 May 2015

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