(19)
(11) EP 3 225 038 A1

(12)

(43) Date of publication:
04.10.2017 Bulletin 2017/40

(21) Application number: 15810768.0

(22) Date of filing: 23.11.2015
(51) International Patent Classification (IPC): 
H04R 3/00(2006.01)
H04R 29/00(2006.01)
(86) International application number:
PCT/IB2015/059029
(87) International publication number:
WO 2016/083971 (02.06.2016 Gazette 2016/22)
(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:
MA MD

(30) Priority: 28.11.2014 GB 201421213

(71) Applicant: Relec SA
1400 Yverdon-les-Bains (CH)

(72) Inventors:
  • ROUX, Alain
    CH-1400 Yverdon-les-Bains (CH)
  • MARTIN, Christian
    CH-1400 Yverdon-les-Bains (CH)
  • PITTET, Antoine
    CH-1202 Genève (CH)
  • STROBINO, David
    CH-1202 Genève (CH)

(74) Representative: Weihs, Bruno Konrad 
ANDRE ROLAND SA P.O. Box 5107
1002 Lausanne
1002 Lausanne (CH)

   


(54) LOW FREQUENCY ACTIVE ACOUSTIC ABSORBER BY ACOUSTIC VELOCITY CONTROL THROUGH POROUS RESISTIVE LAYERS