US 12,249,310 B2
System and method for estimating secondary path impulse response for active noise cancellation
Sattwik Basu, Pittsburgh, PA (US); and Jeffrey Charles Tackett, Allen Park, 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. 17/975,782.
Prior Publication US 2024/0147151 A1, May 2, 2024
Int. Cl. G10K 11/178 (2006.01); H04R 3/02 (2006.01)
CPC G10K 11/17817 (2018.01) [G10K 11/17881 (2018.01); H04R 3/02 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A system for estimating secondary path impulse response (IR) in an active noise cancellation (ANC) system having an estimated secondary path IR filter system and coefficients of a transfer function Ŝp(z) associated with the estimated secondary path IR filter system S(z) for active noise cancellation (ANC), the system comprising:
a secondary path IR estimator comprising;
an adaptive music interference canceller (AMIC) in the secondary path IR estimator;
music signals input to the AMIC;
an adaptive filter system for the AMIC;
the secondary path IR estimator applying the music signals as a test signal for a vehicle cabin speaker system;
the adaptive filter system for the AMIC is enabled by the secondary path IR estimator to calculate new coefficients of a transfer function Ŝm(z) for the AMIC; and
the secondary path IR estimator copies the new coefficients of the transfer function Ŝm(z) for the AMIC to the coefficients of the transfer function Ŝp(z) for the ANC system.