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(11)

EP 3 895 189 A1

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(43) Date of publication: 20.10.2021 Bulletin 2021/42 (21) Application number: 19705335.8 (22) Date of filing: 13.02.2019

(51) International Patent Classification (IPC):  H01F 7/02(2006.01) H01F 7/16(2006.01) H04R 9/06(2006.01) B06B 1/04(2006.01) H01F 7/06(2006.01) H04R 11/02(2006.01) H02K 33/16(2006.01) G06F 3/01(2006.01) (52) Cooperative Patent Classification (CPC): H01F 7/1646; H01F 7/0289; H04R 2400/03; B06B 1/045; H02K 33/16; G06F 3/016; H04R 11/02; H04R 11/14; H02K 33/18; H01F 7/066 (86) International application number: PCT/EP2019/053529 (87) International publication number: WO 2020/164696 (20.08.2020 Gazette 2020/34)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: KH MA MD TN (71) Applicant: Huawei Technologies Co., Ltd. Shenzhen, Guangdong 518129 (CN)	(72) Inventor: MAENPAA, Ossi 16440 Kista (SE) (74) Representative: Maiwald Patent- und Rechtsanwaltsgesellschaft mbH  Elisenhof Elisenstraße 3 80335 München 80335 München (DE)