公开(公告)号：US20240054988A1

公开(公告)日：2024-02-15

申请号：US17763742

申请日：2021-04-22

Applicant: Google LLC

Inventor： Abhijit Shah ,  Guohua Sun ,  Lawrence Frederick Heyl ,  Niel David Warren

IPC: G10K11/178

CPC classification number: G10K11/17855 ,  G10K11/17854 ,  G10K11/17879 ,  G10K11/17885 ,  G10K2210/3053 ,  G10K2210/1081 ,  G10K2210/3027 ,  G10K2210/3026

Abstract: The subject matter described herein provides systems and techniques for filtering an audio signal using active noise cancellation (ANC). A channel response finite impulse response (CR FIR) filter in a conventional ANC system may be replaced with a two filter cascade configuration. The first filter in the cascade filter configuration may be a CR FIR filter with interleaved zero coefficients and the second filter may be a response interpolator filter that is a fixed interpolator. The CR FIR filter in the two filter cascade may be adaptive and may have its non-zero coefficients tracked, updated, adapted, and/or computed. The fixed interpolator in the two filter cascade may be fixed and therefore non-adaptive. The channel frequency response profile of the two filter cascade configuration may be similar to the channel frequency response profile of the conventional CR FIR filter that the cascade filter configuration replaces.