	US 12,260,848 B2
	Method for generating active noise reduction filter, storage medium and earphone
Shali Wei, Guangdong (CN); Chongming Xu, Guangdong (CN); and Xiangen Deng, Guangdong (CN)
Assigned to Shenzhen Bluetrum Technology Co., Ltd., Shenzhen (CN)
Filed by Shenzhen Bluetrum Technology Co., Ltd., Guangdong (CN)
Filed on Sep. 30, 2022, as Appl. No. 17/956,845.
Claims priority of application No. 202111225489.9 (CN), filed on Oct. 21, 2021.
Prior Publication US 2023/0131827 A1, Apr. 27, 2023
Int. Cl. G10K 11/00 (2006.01); G10K 11/178 (2006.01); H04R 1/10 (2006.01)

CPC G10K 11/17815 (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 2210/3022 (2013.01); G10K 2210/3026 (2013.01); G10K 2210/3027 (2013.01); G10K 2210/3028 (2013.01); G10K 2210/3055 (2013.01); H04R 2460/01 (2013.01)]

20 Claims

1. A method for generating an active noise reduction filter, comprising:

obtaining a physically noise-reduced signal, the physically noise-reduced signal being a signal received by a feedback microphone after a noise signal passes through an earphone;

obtaining a mixed signal, the mixed signal being a signal received by the feedback microphone when the same noise signal is played and the earphone plays a through signal in a through state;

calculating an input signal according to the mixed signal and the physically noise-reduced signal;

performing adaptive filtering on the input signal and the physically noise-reduced signal according to an adaptive filtering algorithm to obtain a transfer function; and

generating an active noise reduction filter according to the transfer function.