US 11,722,818 B2
Method and apparatus for recognizing wind noise of earphone, and earphone
Jiudong Wang, Beijing (CN); and Song Liu, Beijing (CN)
Assigned to LITTLE BIRD CO., LTD, Beijing (CN)
Filed by Beijing Xiaoniao Tingting Technology Co., LTD., Beijing (CN)
Filed on Dec. 24, 2021, as Appl. No. 17/645,971.
Claims priority of application No. 202011559834.8 (CN), filed on Dec. 25, 2020.
Prior Publication US 2022/0210552 A1, Jun. 30, 2022
Int. Cl. H04R 1/10 (2006.01); H04R 3/00 (2006.01)
CPC H04R 3/005 (2013.01) [H04R 1/1083 (2013.01); H04R 2410/07 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method for recognizing wind noise of an earphone, the earphone comprising a feedforward microphone located outside an ear and a feedback microphone located inside the ear, wherein the method comprises:
acquiring a feedforward microphone signal collected by the feedforward microphone and a feedback microphone signal collected by the feedback microphone;
performing Fourier transform on the feedforward microphone signal and the feedback microphone signal to obtain a feedforward microphone frequency domain signal and a feedback microphone frequency domain signal;
performing inverse feedback filtering processing on the feedback microphone frequency domain signal to obtain an inverse feedback filtering processing result;
performing inverse feedforward filtering processing on the feedforward microphone frequency domain signal and the inverse feedback filtering processing result to obtain an inverse hybrid filtering processing result; and
obtaining a wind noise recognition result of the earphone based on an interrelationship between the inverse feedback filtering processing result and the inverse hybrid filtering processing result,
wherein the inverse feedback filtering processing is implemented through the following formula:

OG Complex Work Unit Math
wherein FBinvfb is the inverse feedback filtering processing result, FBmic is the feedback microphone frequency domain signal, Hfb is a frequency response of a feedback filter used when feedback noise cancellation of the earphone is enabled at a current time, and G is a transfer function from a loudspeaker inside the earphone to the feedback microphone; and
the inverse feedback filtering processing is implemented by the following formula:

OG Complex Work Unit Math
wherein FBinv is the inverse hybrid filtering processing result, FFmic is the feedforward microphone frequency domain signal, Hff is a frequency response of a feedback filter used when feedforward noise cancellation of the earphone is enabled at the current time, and G is the transfer function from the loudspeaker inside the earphone to the feedback microphone.