Active control of noise in vehicle cabins

Abstract

Active noise control (ANC) technology has been applied to reduce low frequency noise in vehicle cabins. Different from ANC in laboratory conditions, installation of the ANC system in vehicles for a long term use requires the solution of a number of practical issues. This paper reports the progress of a couple of practical ANC installations, and the implication and solution of practical issues such as magnitude and frequency variations (corresponding to different vehicle operating conditions) of the primary and reference signals, and poor coherence between primary and reference signals.