ICaD 2013 6–10 july, 2013, Łódź, Poland international Conference on auditory Display The 19th International Conference on Auditory Display (ICAD-2013) July 6-10, 2013, Lodz, Poland The 19th International Conference on Auditory Display (ICAD-2013) July 6-10, 2013, Lodz, Poland The 19thPRACTICAL International Conference on Auditory RECOMMENDATIONS Display (ICAD-2013) FORJu USINGly 6-10, 2013, Lodz, Poland PRACTICAL RECOMMENDATIONS FOR USING SOUND TRANSDUCERS WITH GLASS SOUNDMEMBERANE TRANSDUCERS AS AUDITORY DISPLAY WITH BASED GLASS ON MEASUREMENTS MEMBERANE AND SIMULATIONSPRACTICAL RECOMMENDATIONS FOR USING SOUND TRANSDUCERS WITH GLASS ASPRACTICAL AUDITORY RECOMMENDATIONS DISPLAY FOR BASED USINGMEMBERANE SOUND ON TRANSDUCERS MEASUREMENTS AS AUDITORY WITH DISPLAY GLASS BASED ON MEASUREMENTS AND MEMBERANE AS AUDITORY DISPLAY BASED ON MEASUREMENTSSIMULATIONS AND György WersényANDi SIMULATIONS József Répás György Wersényi József Répás SzéchenyiGyörgyGyörgy István WersényiWersény Universityi , SzéchenyiJózsefJózsef IstvánRépás Répás University, DepartmentSzéchenyi of István Telecommunications University, , DepartmentSzéchenyi of Telecommunications, István University, Department of Telecommunications, SzéchenyiDepartment István University of Telecommunications,, Széchenyi István University, Széchenyi István University, Széchenyi István University, H-9026,H-9026, Győr, Győr, Egyetem Egyetem t. 1, Hungaryt. 1, Hungary DepartmentH-9026,H-9026, of TelecommunicationsGyőr, Győr, Egyetem Egyetem t. t.1, Hungary1,,Hungary Department of Telecommunications, [email protected] of [email protected] , H-9026,Department Győr, Egyetem ofrepas [email protected], t.@ 1sze.hu, Hungary H-9026, Győr, Egyetem t. 1, Hungary H-9026, Győr, Egyetem t. 1, Hungary H-9026,wersenyi Győr,@sze Egyetem.hu t. 1, Hungary [email protected] a frequency range up to 18 kHz, size-independent directivity, wersenyiABSTRACT@sze .hu [email protected] but with low sensitivity for lower frequencies and insufficient ABSTRACT a frequency range up to 18 kHz, size-independent directivity, stereophonic image. The applicability of DML panels for wave Newly designed vibrating ABSTRACTtransducers can be used coupled a frequency range up to 18 kHz, size-independent directivity,but with low sensitivity for lower frequencies and insufficient field synthesis (WFS)-based sound reproduction has been also directly to solid surfaces such as wood or glass as plane waveNewly designedbut with vibratinglow sensitivity transducers for lower can frequencies be used coupled and insufficient stereophonic image. The applicability of DML panels for wave investigated, where large number of closely spaced short-distanceNewly designed loudspeakers. vibrating Ourtransducers former analysiscan be evaluatedused coupled thedirectly tostereophonic solid surfaces image. such The as woodapplicability or glass of as DML plane panels wave for wavefield synthesis (WFS)-based sound reproduction has been also loudspeakers is necessary. It has been incorporated into a SolidDrivedirectly totransducer solid surfaces glued such on asto woodglass orsurfaces glass as of plane different waveshort-distance field synthesisloudspeakers. (WFS)-based Our former sound analysis reproduction evaluated has the been alsoinvestigated, where large number of closely spaced sizesshort-distance and forms. loudspeakers.Further investigations Our former concludedanalysis evaluated that these theSolidDrive investigated,number transducer of novel gluedwhere products on largeto glass suchnumber surfaces as school ofof differentequipment,closely spaced portableloudspeakers is necessary. It has been incorporated into a parametersSolidDrive do transducernot influence glued the on transmission to glass surfaces and quality of different of thesizes andloudspeakersfolding forms. speakersFurther is necessary.investigationsetc. [1]. It hasconcluded been incorporatedthat these into numbera of novel products such as school equipment, portable coupledsizes andsystem forms. significantly. Further investigations The second concluded part thatof thesethisparameters numberRecently, do not of influence anovel new groupproducts the transmission of loudspeakerssuch as schooland qualityhas equipment, been of introduced:the portablefolding the speakers etc. [1]. investigationparameters includeddo not influence only one the size transmission and geometry and quality for further of thecoupled foldingsosystem called speakerssignificantly. “invisible etc. [1 ].audio”The second [2-4]. partManufacturers of this shipRecently, the a new group of loudspeakers has been introduced: the numericalcoupled simulationssystem significantly. using COMSOL The secondFEM, aspart well of as thisforinvestigation Recently,vibrating included atransducer new only group one only of size loudspeakers about and geometrya size has of beenfora beer further introduced: can that cantheso becalled “invisible audio” [2-4]. Manufacturers ship the acousticinvestigation measurements included ofonly the one transfer size and function geometry at for selected furthernumerical somounted simulations called on“invisible usingany glass COMSOL audio” or wooden [ 2-4].FEM, Manufacturerssurfaceas well suchas for as ship windows, thevibrating transducer only about a size of a beer can that can be frequencies.numerical Examinationsimulations usingof different COMSOL wall-fixing FEM, asand well mounting as foracoustic vibratingdoors,measurements tables transducer etc. of Inthe only this transfer aboutway the a functionsize vibrating of a atbeer surfaceselected can that becomes can bemounted the on any glass or wooden surface such as windows, methodsacoustic were measurements also included. of Concludingthe transfer resultsfunction show at thatselected thefrequencies. mountedmembrane, Examination on radiatingany of glass different almostor wooden wall-fixing plane surface waves. and mountingsuch According as windows, todoors, the tables etc. In this way the vibrating surface becomes the overallfrequencies. sound Examinationquality is ofinferior different to wall-fixing regular loudspeakers,and mountingmethods doors,weremanufacturers also tables included. etc. the In soundthisConcluding way quality the resultsvibrating is “good”, show surface thatbut becomesthebrochures themembrane, and radiating almost plane waves. According to the however,methods using were a alsosupplementary included. Concluding subwoofer resultsresults show in enjoyable that theoverall soundmembrane,commercial quality radiating materials is inferior almost do notto planecontainregular waves. reliableloudspeakers, According measurement to themanufacturers data. the sound quality is “good”, but brochures and musicoverall transmission sound quality for a short is inferiordistance. to Furthermore, regular loudspeakers, placementhowever, manufacturersBecauseusing a supplementary these the systems sound subwoofer could quality be is anresults “good”, alternative in enjoyablebut brochuresalso for auditory andcommercial materials do not contain reliable measurement data. of thehowever, transducer using ain supplementary the middle of subwoofer the membrane results inand enjoyable havingmusic transmissioncommercialdisplays, for materials anarrative short distance.do applications not contain Furthermore, reliable(installations, placement measurement museums), data.Because for these systems could be an alternative also for auditory Because these systems could be an alternative also for auditorydisplays, for narrative applications (installations, museums), for mountingmusic transmission points at the for cornersa short distance.are recommended Furthermore, in placementpracticalof the transducerpersonal inuse the etc., middle we analyzed of the membrane the possibilities and having of one of them. displays, for narrative applications (installations, museums), forpersonal use etc., we analyzed the possibilities of one of them. applications.of the transducer in the middle of the membrane and havingmounting Our points investigation at the corners included are recommended numerical simulations in practical using Finite- Our investigation included numerical simulations using Finite- mounting points at the corners are recommended in practicalapplications. personalElement-Methods use etc., we (FEM) analyzed with the the possibilities COMSOL of software one of them. package, Our investigation included numerical simulations using Finite-Element-Methods (FEM) with the COMSOL software package, applications. as well as acoustic and vibration measurements for comparison Element-Methods (FEM) with the COMSOL software package,as well as acoustic and vibration measurements for comparison [5-8]. Our goal was to determine the technical parameters, 1. INTRODUCTION as well as acoustic1. INTRODUCTION and vibration measurements for comparison[5-8]. Our goal was to determine the technical parameters, [5-8].overall Our sound goal quality was to and determine application the areastechnical depending parameters, onoverall the sound quality and application areas depending on the 1. INTRODUCTION material of the vibrating surface, size and geometry, placement In auditory display design we usually incorporate withIn auditoryoverall display sound designquality weand applicationusually incorporate areas depending with on thematerial of the vibrating surface, size and geometry, placement of the transducers and mounting methods [9]. Figure 1 andof the 2 transducers and mounting methods [9]. Figure 1 and 2 headphonesIn auditory and/or display loudspeakers.