US 12,230,241 B2
System and method for secondary path switching for active noise cancellation
Sattwik Basu, Pittsburgh, PA (US); Kevin J. Bastyr, Franklin, MI (US); Jeffrey Charles Tackett, Allen Park, MI (US); David Trumpy, Novi, MI (US); Geon-Seok Kim, Novi, MI (US); and Tao Feng, Novi, MI (US)
Assigned to Harman International Industries, Incorporated, Stamford, CT (US)
Filed by Harman International Industries, Incorporated, Stamford, CT (US)
Filed on Oct. 28, 2022, as Appl. No. 17/976,048.
Prior Publication US 2024/0144905 A1, May 2, 2024
Int. Cl. G10K 11/178 (2006.01)
CPC G10K 11/17817 (2018.01) [G10K 11/17823 (2018.01); G10K 11/17825 (2018.01); G10K 11/17881 (2018.01); G10K 2210/12821 (2013.01); G10K 2210/30232 (2013.01); G10K 2210/3026 (2013.01); G10K 2210/3027 (2013.01); G10K 2210/3028 (2013.01); G10K 2210/3044 (2013.01)] 22 Claims
OG exemplary drawing
 
1. An active noise cancellation (ANC) system comprising:
at least one audio signal source to provide an audio signal in a cabin of a vehicle;
at least one loudspeaker to project anti-noise sound within the cabin of a vehicle in response to receiving an anti-noise signal;
a first microphone to provide a first error signal indicative of noise, the audio signal, and the anti-noise sound within the cabin;
a second microphone to provide a second error signal indicative of an estimated anti-noise signal; and
at least one controller programmed to:
receive the first error signal and the second error signal; and
provide an estimated impulse response based at least on the first error signal and the second error signal;
compare the estimated impulse response to one or more pre-stored impulse responses;
select a first pre-stored impulse response that matches the estimated impulse response to filter one or more reference signals at an adaptive filter to generate the anti-noise signal; and
compare the estimated impulse response to one or more pre-stored impulse responses for one or more loudspeaker and microphone combinations, respectively, in the vehicle.