	US 12,217,733 B2
	Road noise cancellation shaping filters
Tao Feng, Novi, MI (US); and Kevin J. Bastyr, Franklin, MI (US)
Assigned to HARMAN INTERNATIONAL INDUSTRIES, INCORPORATED, Stamford, CT (US)
Filed by Harman International Industries, Incorporated, Stamford, CT (US)
Filed on Feb. 4, 2022, as Appl. No. 17/592,861.
Prior Publication US 2023/0252967 A1, Aug. 10, 2023
Int. Cl. G10K 11/178 (2006.01)

CPC G10K 11/17823 (2018.01) [G10K 11/17817 (2018.01); G10K 11/17837 (2018.01)]

20 Claims

1. A road noise cancellation (RNC) system comprising:

at least one loudspeaker to project anti-noise sound within a passenger cabin of a vehicle in response to an anti-noise signal; and

a controller programmed to:

determine a noise signal indicative of road induced noise using an output signal measured by a force gauge;

determine a coherence value between the noise signal and an error signal indicative of noise and the anti-noise sound within the passenger cabin;

estimate a noise reduction value based on the coherence value;

filter the noise signal and the error signal based on the estimated noise reduction value; and

generate the anti-noise signal based on the filtered noise signal and the filtered error signal.