	US 11,735,200 B2
	Dual-microphone adaptive filtering algorithm for collecting body sound signals and application thereof
Hongqiang Mo, Guangzhou (CN); and Xiang Tian, Foshan (CN)
Assigned to SOUTH CHINA UNIVERSITY OF TECHNOLOGY, Guangzhou (CN); and FOSHAN BAIBUTI MEDICAL TECHNOLOGY CO., LTD., Foshan (CN)
Appl. No. 17/282,761
Filed by SOUTH CHINA UNIVERSITY OF TECHNOLOGY, Guangdong (CN); and FOSHAN BAIBUTI MEDICAL TECHNOLOGY CO., LTD., Guangdong (CN)
PCT Filed Oct. 10, 2019, PCT No. PCT/CN2019/110287 § 371(c)(1), (2) Date Apr. 4, 2021, PCT Pub. No. WO2020/114071, PCT Pub. Date Jun. 11, 2020.
Claims priority of application No. 201811485004.8 (CN), filed on Dec. 6, 2018.
Prior Publication US 2022/0005491 A1, Jan. 6, 2022
Int. Cl. G10L 21/0216 (2013.01); A61B 7/02 (2006.01); H04R 3/00 (2006.01); H04R 3/04 (2006.01)

CPC G10L 21/0216 (2013.01) [A61B 7/02 (2013.01); H04R 3/005 (2013.01); H04R 3/04 (2013.01); G10L 2021/02165 (2013.01)]

9 Claims

1. A dual-microphone adaptive filtering algorithm for collecting body sound signals, characterized in that, using at least two microphones, a primary microphone and a secondary microphone, to collect signals; the primary microphone is used to collect noisy body sound signals, and the secondary microphone is used to collect environmental noise; applying a same high-pass filtering to signals collected by the primary microphone and signals collected by the secondary microphone, so that primary microphone signals and secondary microphone signals after the high-pass filtering have a good linear correlation; using a normalized least mean square algorithm on the primary microphone signals and the secondary microphone signals after the high-pass filtering to calculate a weight of the adaptive filter and to calculate an error signal to filter out environmental noise in the primary microphone signals; processing the error signal for a first time by a low-pass filtering to restore the body sound signals, to obtain the body sound signals output by the adaptive filtering algorithm.