The behaviour of an adaptive algorithm with a moving primary source.

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  • behaviour of an adaptive algorithm with

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Adaptive algorithms, such as LMS are often used in active noise control systems to updatethe strength of the secondary sources. Generally, the assumption of ‘time invariant system’ is introduced and the convergence behaviour of the algorithm is examined. If we try toapply the active scheme to traffic noise control, however, the time invariant assumption isapparently invalid due to the drastic changes in the primary paths. This paper describespreliminary investigations of such cases i.e., the tracking ability of the adaptive algorithmwith moving primary source. The feedforward structure is assumed in the control system, and the well known multichannel filtered-x LMS is used as an adaptive algorithm. Theconvergence properties are examined in both frequency and time domains. The results ofthe simulations in the frequency domain indicate that the attenuation varies irregularlycompared with the case of a stationary primary source. In the time domain calculation, approximately 2 to 3 dB stable attenuation was obtained, however, an adverse effect was alsoobserved especially when the primary source passed in front of the system.

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