US 11,721,315 B2
Active noise cancellation integrated circuit for stacking multiple anti-noise signals, associated method, and active noise cancellation headphone using the same
Chao-Ling Hsu, Hsinchu County (TW); Li-Wen Chi, Hsinchu County (TW); and Kai-Sheng Chen, Taipei (TW)
Assigned to AIROHA TECHNOLOGY CORP., Hsinchu (TW)
Filed by AIROHA TECHNOLOGY CORP., Hsinchu (TW)
Filed on Mar. 21, 2022, as Appl. No. 17/699,631.
Claims priority of application No. 202111233417.9 (CN), filed on Oct. 22, 2021.
Prior Publication US 2023/0131573 A1, Apr. 27, 2023
Int. Cl. G10K 11/178 (2006.01)
CPC G10K 11/17853 (2018.01) [G10K 11/17825 (2018.01); G10K 11/17881 (2018.01)] 19 Claims
OG exemplary drawing
 
1. An active noise cancellation integrated circuit for stacking multiple anti-noise signals, comprising:
a first path, outputting a first path anti-noise signal, wherein the first path anti-noise signal is converted into a first signal by a physical channel, wherein the first path comprises:
a first active noise cancellation (ANC) filtering unit, for generating a first anti-noise signal;
a second path, receiving an error signal comprising a component of the first signal, and outputting a second path anti-noise signal to the physical channel, wherein the second path comprises:
a second ANC filtering unit, for generating a second anti-noise signal, wherein the second path anti-noise signal is derived from the second anti-noise signal; and
a first decoupling unit, for removing the component of the first signal from the second path based on the first anti-noise signal.