US 12,462,784 B2
Audio processing device
Kai-Sheng Chen, New Taipei (TW); En-Tai Kuo, Zhubei (TW); Dong-Jun Lin, Taipei (TW); and Shih-Kai He, New Taipei (TW)
Assigned to AIROHA TECHNOLOGY CORP., Hsinchu (TW)
Filed by Airoha Technology Corp., Hsinchu (TW)
Filed on Jul. 1, 2022, as Appl. No. 17/856,245.
Claims priority of provisional application 63/287,561, filed on Dec. 9, 2021.
Prior Publication US 2023/0186890 A1, Jun. 15, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. G10K 11/178 (2006.01); H04R 1/10 (2006.01)
CPC G10K 11/17854 (2018.01) [G10K 11/17819 (2018.01); G10K 11/17823 (2018.01); G10K 11/17825 (2018.01); G10K 11/17881 (2018.01); H04R 1/1083 (2013.01); G10K 2210/1081 (2013.01); G10K 2210/3026 (2013.01); G10K 2210/3027 (2013.01); G10K 2210/3028 (2013.01); G10K 2210/3044 (2013.01); H04R 2460/01 (2013.01)] 10 Claims
OG exemplary drawing
 
1. An audio processing device, comprising:
a first active noise cancellation (ANC) filter, configured to generate a first anti-noise signal by applying only a time domain filtering to a full band of an error signal during an ANC period, the error signal is representative of audible sound at a target space; and
a second ANC filter, configured to generate a second anti-noise signal by applying only the time domain filtering to the full band of the error signal during the ANC period,
wherein the first and second anti-noise signals are each simultaneously converted into an acoustic anti-noise signal to cancel environmental noise, or the first and second anti-noise signals in combination are converted into the acoustic anti-noise signal to cancel environmental noise,
wherein the acoustic anti-noise signal is included in the error signal, and wherein the first ANC filter is connected to the second ANC filter in parallel,
wherein the first ANC filter and the second ANC filter are independent of each other, and
wherein the ANC period excludes a transition period in which both the first ANC filter and the second ANC filter temporarily generate the first anti-noise signal and the second anti-noise signal prior to only one of the first ANC filter and the second ANC filter generating the corresponding one of the first anti-noise signal and the second anti-noise signal.