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(11)

EP 3 638 429 A1

(12)

(43) Date of publication: 22.04.2020 Bulletin 2020/17 (21) Application number: 18746282.5 (22) Date of filing: 18.06.2018

(51) International Patent Classification (IPC):  B06B 1/06(2006.01) H04R 1/44(2006.01) G10K 11/00(2006.01) (86) International application number: PCT/IB2018/054471 (87) International publication number: WO 2018/229735 (20.12.2018 Gazette 2018/51)

(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 (30) Priority: 16.06.2017 PT 2017110152 (71) Applicants: Universidade do Minho 4700-553 Braga (PT) Universidade Do Algarve 8005-139 Faro (PT)	(72) Inventors: SILVA MARTINS, Marcos 4800 - 058 Guimarães (PT) VALENTE GONÇALVES, Luís Miguel 4800 - 058 Guimarães (PT) FREITAS GOMES DA SILVA, Ant nio Jo o 8005-203 Faro (PT) MACHADO JESUS, Sergio Manuel 8005-139 Faro (PT) (74) Representative: Patentree  Edificio Net Rua de Salazares, 842 4149-002 Porto 4149-002 Porto (PT)