19th Asia-Pacific Vibration Conference (APVC2021)

60 / 2021-03-29 11:51:31

A Diffusion Transform Domain FxLMS Algorithm For Multi-Channel Active Noise Control With Variable Spatial Smoothing

diffusion FxLMS,transform domain,multitask problem,network design,performance analysis

Special Sessions > Applications of active control

This paper studies the multichannel diffusion active noise control (ANC) systems, where a

group of controllers and error microphones are physically distributed at different locations

within an extended area and could communicate with each other in a distributed manner.

Since conventional diffusion ANC algorithms introduce the estimation bias via

communication between local controllers and degrade the overall performance, we aim to

develop a new diffusion filtered-x (Diff-Fx) based algorithm that incorporates knowledge

of spatial smoothness and balances between communication strength and estimation bias.

To further increase the convergence speed and save computational complexity, the

transform domain (TD) technique is employed. A detailed performance analysis is carried

out for the resulting Diff-TD-FxLMS algorithm. A variable spatial regularization (SR) rule

is derived from the analysis, which could adjust the diffusion strength automatically. The

performance of the proposed algorithm is also compared with conventional methods.