Ford Global Technolgoies, LLC

University of Cincinnati

Tao Feng

Ming-te Cheng

Takeshi Abe

Ming-Ran Lee

Liqun Na

Mingfeng Li

Frederick Wayne Vanhaaften

Teik Lim

Guohua Sun

An active noise control (ANC) system includes a speaker and one or more processors. The one or more processors implement an adaptive subband filtered reference control algorithm that applies thresholds to reference and error feedback signal paths such that, in response to a series of broadband non-Gaussian impulsive reference signals indicative of road noise in the vehicle having an audible frequency range of 20 Hz to 20 kHz, weight coefficients defining an adaptive filter of the control algorithm converge and permit the ANC system to partially cancel the road noise via output of the speaker.

Subband algorithm with threshold for robust broadband active noise control system

An active noise control (ANC) system includes a speaker and one or more processors programmed to implement a delayless subband filtered-x least mean square control algorithm. The algorithm includes a variable bandwidth discrete Fourier transform filter bank having a number of subbands such that the system, in response to a broadband white noise reference signal indicative of road noise in the vehicle, exhibits a uniform gain spectrum across a frequency range defined by the subbands and partially cancels the road noise via output of the speaker.

Variable bandwidth delayless subband algorithm for broadband active noise control system

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Cincinnati, OH, United States of America

Tao Feng