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SUMMARY:IEM Seminar: Electroacoustic Metamaterials : towards programmable 
 acoustic interfaces for sound field control
DTSTART:20211203T131500
DTEND:20211203T141500
DTSTAMP:20260930T194330Z
UID:42b73cb787daa81763ca330d25dc053035afe96fa00538facf59c3a3
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr. Hervé Lissek\, Signal Processing Laboratory LTS2.\nAbstra
 ct: Acoustic metamaterials (/metasurfaces) have raised a growing interest 
 in the scientific community during the last decade\, exhibiting a wide ran
 ge of amazing acoustic properties (negative refraction\, anomalous reflect
 ion/transmission\, etc.). One of the specificities of such concept is that
  the size of their elementary constitutive elements is much smaller than t
 he wavelength of interest. Such metamaterials can then be employed for des
 igning practically small soundproofing materials for the (audible) low-fre
 quency regime\, where conventional solutions (obeying the “quarter-wavel
 ength” rule) are unavoidably cumbersome. However\, most if not all of th
 e metamaterial structures reported so far fail to show applicable properti
 es\, mainly due to passive structures that are inherently resonant and los
 sy\, therefore effective only over very limited frequency bandwidths\, if 
 not ineffective at all.\n \nThe development of active acoustic control te
 chniques may allow overcoming such limitations. In this talk\, I will pres
 ent the concept of Electroacoustic Resonator that I developed in the last 
 decade\, allowing turning a conventional loudspeaker into a broadband soun
 d absorber with adjustable acoustic properties\, that can be easily tuned 
 on-the-fly. Several applications of the concepts have been successfully as
 sessed so far\, such as low-frequency room modes damping (this work has le
 d to the only commercial product available on the market\, AVAA C20 by PSI
  Audio)\, or Tunable Acoustic Liners for aircraft engines noise reduction.
  New routes are now envisaged towards the application of such active reson
 ators to metamaterials and metasurfaces\, in a view to achieving controlla
 ble and broadband sound wave redirection (reflection/transmission)\, with 
 potential applications to room acoustics and noise control engineering.\n\
 nBio: After a PhD in Acoustics in 2002\, Dr. Lissek joined EPFL and the La
 boratoire d’Electromagnétisme et d’Acoustique (LEMA) to supervise the
  active noise control activities of the Acoustic Research Group\, headed b
 y Prof. Mario Rossi.  In 2006\, Dr. Lissek took the leadership of the Aco
 ustic Group\, and launched several expertise activities together with new 
 research topics\, especially in the frame of Aircraft Noise Research in EU
  projects (FP7-TEENI\, FP7-OPENAIR\, FP7-XNOISE EV\, FP7-ENOVAL\, H2020-Sm
 artAnswer\, H2020-ARTEM\, H2020-SALUTE). Since 2015\, Hervé Lissek and th
 e Acoustic Group are affiliated to the Laboratoire de Traitement des Signa
 ux 2 (LTS2) with Pierre Vandergheynst. The research activities range from 
 acoustic signal processing (spatial sound rendering in hearing-aids\, comp
 ressive sensing of sound fields) to acoustic metamaterials (acoustic prism
 \, non-Hermitian acoustic media)\, through active sound absorption (low-fr
 equency room modes damping\, aircraft engine noise reduction) and novel el
 ectroacoustic transducers concepts (corona discharge loudspeaker).
LOCATION:ELA 2 https://plan.epfl.ch/?room==ELA%202 https://epfl.zoom.us/j/
 68823821572?pwd=SVlBVCtYc3IvNjlKMUE3Rk5BS0tFZz09
STATUS:CONFIRMED
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