Abstract
An active acoustic attenuation system (200) has a first adaptive filter model M modeling the acoustic path P from an input transducer (10) to an output transducer (14), and a second adaptive filter model Q modeling the overall system from the input transducer (10) to an error transducer (16). A third adaptive filter model T models the transfer function S of the output transducer (14) and the error path E between the output transducer (14) and the error transducer (16), without an auxiliary random noise source.
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