ŠÍRENIE HLUKU POZADIA V ŠKOLSKEJ TRIEDE A JEHO VPLYV NA ZROZUMITEĽNOSŤ REČI
|
|
- Jesse Ryan
- 7 years ago
- Views:
Transcription
1 ŠÍRENIE HLUKU POZADIA V ŠKOLSKEJ TRIEDE A JEHO VPLYV NA ZROZUMITEĽNOSŤ REČI Michal Jelínek a), Monika Rychtáriková a)b), Gerrit Vermeir b) Adresa a) Katedra konštrukcií pozemných staveb, Stavebná fakulta STU Bratislava, SLOVAKIA b) Laboratory ATF, Department of Physics and Astronomy, K.U. Leuven, BELGIUM jelinekmichal@yahoo.com Abstract: Schools often tolerate noisy classrooms. Managers may found acoustical treatment expensive and difficult, or they may not even recognize the problem. Poor acoustics interferes with speech intelligibility which influences the teaching and learning process. Speech intelligibility can be described by STI values, which depends on the background noise level and the reverberation in the room. Background noise value used for the calculation is often given as one value for the whole room. However, the noise from the traffic entering classroom through the bad quality windows, or noise coming from the corridor through a door cause uneven distribution of background noise in the classroom. This paper shows results of STI in noise values in the example of a classroom simulated in the Odeon software. The conclusion shows that the distribution of the STI values in the classroom doesn t depend only on the of the teacher but also on the of the receiver related to the location of the acoustically weak element. Úvod Doterajšie štúdie ukázali negatívny vplyv hluku (šumu) v triedach škôl na sústredenie sa študentov a ich výsledky. Hluk v triedach nepôsobí len rušivo a znižuje pozornosť, ale výrazným spôsobom znižuje aj zrozumiteľnosť reči Zrozumiteľnosť reči je reprezentovaná niekoľkými parametrami. závisí najmä od času dozvuku, šumu pozadia, frekvencie, a vzdialenosti zdroja zvuku od poslucháča. V súčasnosti nie je v praxi jednoduché merať šum pozadia na rôznych pozíciách v triede. Našim cieľom však bolo, merať šum pozadia na viacerých miestach s viacerými hlukomermi simultánne. Introduction Present studies show the influence of noise in the classrooms onto concentrations of students and their study-results, but high levels of background noise has not only disturbing character, but it also significantly reduces the speech intelligibility. Speech intelligibility can be represented by several parameters. Some of them take into account the reverberation of the room, e.g. This time variance makes the measurement of the differences in BKG noise on different s in the classroom impossible, unless we would have the opportunity to measure with more channels or more sound-level-meters at the same time.
2 Takéto meranie samozrejme nie je príliš praktické. V praxi sa meria šum pozadia na jednom bode v strede miestnosti a táto hodnota sa berie ako celoplošná hladina šumu pozadia. Otázkou však je, ako veľmi sa v skutočnosti líši šum pozadia na rôznych miestach. V triede B117 na Svf STU Bratislava, ktorá je orientovaná do rušnej ulice, bolo vykonané meranie na dvoch miestach, kde jeden mikrofón bol umiestnený v blízkosti okna a druhý do stredu miestnosti. Ukázalo sa, že aj v jednoduchej triede môže hladina šumu pozadia kolísať v rozmedzí nad 3dB. Tento veľký rozdiel nás priviedol na myšlienku nasimulovať túto situáciu v programe Odeon, ktorý umožňuje zadávať plošné zdroje zvuku (v našom prípade okná) s frekvenčným spektrom nameraného hluku. Ak takýmto spôsobom zmapujeme šum pozadia, je veľmi ľahko badateľná jeho nehomogenita a z tohto pohľadu index STI už neovplyvňuje len vzdialenosť zdroja zvuku od poslucháča, ale aj vzdialenosť zdroja šumu od poslucháča. Jednoduchým príkladom takéhoto stavu je, že študent sedí pri otvorenom, príp. akusticky zlom okne. Preňho je zrozumiteľnosť reči učiteľa podstatne horšia ako pre študentov, ktorí môžu sedieť dokonca ďalej od katedry, ale takisto aj ďalej od hluku z ulice cez otvorené okno. This approach is of course not very practical in case of acoustical consultancy, where measurement of the BKG noise is usually performed by choosing one reference, somewhere in the centre of the room, and the value calculated on that chosen is presumed to be the value of the BKG noise all over the audience surface. But how much can a BKG noise vary from to in reality? In one of the classrooms at Faculty of Civil Engineering in Bratislava, which is oriented to very noisy street, 2 channel measurement was performed by placing one microphone close to the window and the second in the middle of the room. The measured difference in SPL(A) values was 3dB. Rather big measured difference has given us an idea to simulate this situation in Odeon software, which allows us to model surface sources (in our case the windows) with a frequency spectrum of the noise. Being able to obtain the values of inhomogeneous BKG noise distribution in the room, we could predict the STI values not only the sound source (teacher) - listener dependent, but also by taking into account the distance of the listener from the source of the noise (in our case from the acoustically bad window or a door). A simple example of this situation would be a student sitting near the opened or acoustically bad window. For him can be the understanding of the teacher much worst, then for the students sitting maybe far from the teacher, but also far from the noise source. Obr.1: Virtuálny model miestnosti B117
3 Metodika Pre lepšie pochopenie vplyvu nerovnomerne rozloženého hluku pozadia na zrozumiteľnosť reči v triede, sme pre simulácie v programe Odeon vytvorili tri alternatívy. Každá alternatíva bola založená na rozdielnej pohltivosti v triede za pomoci zmien akustických vlastností použitých materiálov. Prvá alternatíva (alt1) predstavuje skutočnú učebňu B117 na Stavebnej fakulte STU v Bratislave s pohltivosťou (na 1kHz) α = 8%, druhá (alt2) je akusticky upravená trieda s minimálnou odporúčanou hodnotou času dozvuku pre triedy RT(s) = s a pohltivosťou (na 1kHz) α = 19% (pre dosiahnutie optimálnej akustickej pohody) a tretia alternatíva (alt3) je trieda s maximálnou, v triede reálne dosiahnuteľnou, pohltivosťou (okná, podlaha či tabuľa nie sú z pohltivého matreriálu) Tu sme dosiahli koeficient α na 1 khz 56%. V každej z troch alternatív sme použili dve varianty šumu pozadia podľa jeho vlastností a polohy. 1./ šum z ulice hluk z dopravy vnikajúci do triedy cez okná. 2./ šum z priľahlej chodby - hluk z chodby vnikajúci do triedy cez dvere, založený na zvuku hovoriacich ľudí. Simulácie Na simuláciu hluku z dopravy sme použili plošné zdroje reprezentujúce okná, cez ktoré vniká hluk do triedy. Pre simuláciu bolo použité frekvenčné spektrum namerané v reálnej triede. Hluk prichádzajúci slabo zvukovo izolujúcimi dverami bol simulovaný ako plošný zdroj zvuku z priľahlej chodby. Frekvenčné spektrum oboch zdrojov hluku vidno v tabuľke 1. Methods To understand the effect of the uneven distribution of the background noise onto speech intelligibility in the classroom better, simulations in the Odeon software were performed in three alternatives. Each alternative was based on different amount of the absorption in the room (by changing the acoustical properties of interior surfaces). Alternative No.1 (Alt.1) is a model of a real-measured classroom with the average sound absorption α 1 = 8% (at 1kHz). The second alternative (Alt.2) is a classroom with reverberation time RT(s) = s, where the average sound absorption coefficient is α 2 = 19% (at 1kHz). The last alternative (Alt.3) is a situation with the maximal possible absorption, which we could realistically apply in this room, e.g. windows, floor, blackboard and tables are not absorptive. The average absorption coefficient in the third alternative at 1kHz is α 3 = 56%. In each of the three alternatives, two main BKG noise conditions, based on the character and the placement of the source of noise were analyzed: 1./ The noise from the street - traffic noise, entering room via windows 2./ The noise from the school corridor, entering room through the door Simulations To simulate the BKG noise caused by the traffic noise, two windows in the acoustical model represent the surface sound sources, with frequency spectrum of a BKG noise measured in the real classroom. Simulation of the BKG noise in the classroom with acoustically weak door, this door is considered as a surface sound source, with properties of the sound coming to the classroom from the corridor. Frequency spectra of the both noise sources are given in the Table 1.
4 Tab 1: parametre zdrojov zvuku noise power spectra frequency (Hz) SPL SPL(A) (db) k 2k 4k 8k (db) (db) noise source W (windows) noise sourced (door) talker (db) Výpočty boli analyzované pre zdroj zvuku so smerovosťou hovoriacej osoby, simulujúcej učiteľa. (Tab.1.) Index STI bol hodnotený v podmienkach dvoch rôznych zdrojov šumu pozadia: 1./ rovnomerná hladina šumu pozadia na všetkých pozíciách (hodnota bola vybraná z prvej simulácie šumu na pozícii č. 5, ktorá je približne v strede miestnosti) 2./ nerovnomerná hladina šumu pozadia na každej pozícii zadaná podľa prvej simulácie šumu. (Tieto hodnoty dávajú reálnejší obraz o zrozumiteľnosti reči v závislosti od hluku v danej triede) Calculations were performed for the sound source with a directivity of a speaking person, representing the talking teacher. (Tab.1.) Two background noise conditions were considered while calculating the STI in noise: 1./ value all over the s. (This value was taken from the simulation 1 at the 5, which is approximately in the middle of the room). 2./ level at each according to simulation 1. (which should normally give more realistic results of the STI in noise.) Okná pôsobiace ako plošný zdroj hluku S1 Učiteľ ako zdroj zvuku dvere pôsobiace ako plošný zdroj hluku P3 S Z 4 1 S1 P Z mikrofóny 6 X Y O 3 2 mikrofóny 8 X 9 O Y 6 3 Obr. 2: Dve varianty rozmiestnenia zdrojov hluku Tieto dve varianty (rovnomerná a nerovnomerná hladina šumu pozadia) boli pre vyhodnotenie indexu STI porovnané v rámci každej alternatívy. Rozdiely medzi variantmi v podstate poukazujú na chyby, ktorých sa môžeme dopustiť, pokiaľ nevezmeme do úvahy nerovnomernosť šumu pozadia v triede. These two approaches (constant and ) to calculate STI in noise were compared within each alternative. Differences between the two approaches represent in fact the errors we can make in calculation if we neglect the uneven distribution of the BKG noise in the room.
5 Výsledky Alternatíva 1 Alternatíva 1 je model s približne 8% priemernou pohltivosťou materiálov. Na obr. 3 môžme vidieť výsledky šírenia šumu pozadia (SPL(A) v db). Obr. 3 vľavo zobrazuje výsledky simulácie, kde sú ako zdroje zvuku zadané okná, vpravo sú zdrojom zvuku dvere. Môžeme vidieť, že rozdiely akustického tlaku nie sú výrazné. Je to kvôli nízkej pohltivosti v tejto alternatíve. Z obrázkov je tiež zrejmé, že rozdiely medzi najnižšou a najvyššou hladinou hluku sú nižšie pre simuláciu v ktorej boli zdrojom hluku okná, ako pri simulácii v ktorej boli zdrojom hluku dvere. Tento rozdiel je možné vysvetliť tým, že okná majú podstatne väčšiu plochu v porovnaní s dverami. Takisto aj línie zobrazujúce hodnoty nie sú celkom rovnomerné z dôvodu výpočtu, ktorý hodnotil plochu po 0,5m a tiež preto, že trieda obsahovala aj nábytok. Results Alternative 1 Alternative 1 is the situation with around 8% of the average sound absorption. In the Figure 7 we can see the results of the BKG noise distribution (given as SPL(A) in db) as calculated in the simulation. Figure 7 left gives results from the simulation where the two windows act as sound sources (noise source W), right picture shows the situation with the noise source D (door). We can see that the values don t vary too much in general. It is due to the lack of absorption in this alternative. It is also clear that in the situation with the noise source W are the differences between the lowest and highest values smaller that in the situation with the noise source D. This is caused by the fact that the surface of the windows is much bigger then the one of the door. Contours of the given values are also not completely smooth due to the raster of the calculation which was set to m and also because the model contains furniture. a) b) Obr. 3: Rozloženie hluku (počítané pre 1kHz a) Alt.1 s oknami, b) Alt.1 s dverami STI alt1 windows STI alt1 door Obr. 4: vplyv hluku pozadia na zrozumiteľnosť reči v triede alt. 1
6 Alternatíva 2 V tejto alternatíve je priemerná pohltivosť zvuku okolo 20%, čo zodpovedá hodnote RT = s v tomto priestore. Táto hodnota dozvuku je najnižšia prijateľná hodnota pre takúto triedu, pretože jej ďalšie zníženie by už znamenalo jej pretlmenie, t.j. zvuk by sme vnímali ako príliš suchý. Na obrázku 5 vidno, že rozdiely hodnôt sa pohybujú v rozsahu 4dB pri hluku z okien a okolo 8dB pri hluku z dvier. Ak sa pozrieme na hodnoty STI, zistíme určitý rozdiel medzi výsledkami s konštantným, respektíve nerovnomerným hlukom pozadia. Je tiež zaujímavé, že zrozumiteľnosť reči je na pozíciách 2, 3 alebo 6, o viac ako 5% vyššia než na pozícii 8, ktorá je dokonca bližšie k rečníkovi. Alternative 2 In this alternative, average sound absorption of the room was around 20%, what is resulting in the RT = s. This value of the reverberation time is the lowest desired value for a classroom, because more absorption would cause too dry acoustical conditions. As we can conclude from the figure 5, the values vary in the range of 4dB in the noise source W situation and around 8 db in case of the noise source D. If we have a look at the STI values we will find a slight difference between the too approaches (constant or uneven BKG noise.) It is also interesting, that by calculating the speech intelligibility is more than 5% higher at the s 2, 3 or 6, than for example STI at 8, which is closer to the speaker. a) b) Obr. 5: Rozloženie hluku (počítané pre 1kHz a) Alt.2 s oknami, b) Alt.2 s dverami STI alt.2 windows 0.8 STI alt.2 door Obr. 6: vplyv hluku pozadia na zrozumiteľnosť reči v triede alt. 2
7 Alternatíva 3 3. alternatíva predstavuje situáciu s maximálnou pohltivosťou materiálov, ktorá sa dá reálne dosiahnuť (okná, podlaha, tabuľa a stoly nie sú pohltivé). Priemerná pohltivosť v tejto alternatíve tak dosiahla viac ako 50%. Takáto hodnota je pre triedy veľmi neobvyklá a v tomto prípade slúži len na ilustráciu možných výsledkov. Distribúciu hluku pozadia vidno na obrázku 7 a hodnoty STI na obrázku 8. Rozdiel 10% v hodnotách STI vidno na pozíciách 7, 8, 9. Takisto kvôli vplyvu hluku pozadia je STI hodnota na pozícii 7, (ktorá je priamo pred rečníkom) o niečo nižšia ako hodnota STI na pozícii 5, ktorá je umiestnená ďalej. Kvôli hluku pozadia šíriaceho sa z chodby je najväčší rozdiel v hodnotách STI na pozícii 1 (najbližšie ku dverám). Tu môže byť STI až okolo 22% nižšia, než pre výsledky, ktoré by sme dosiahli pri použití konštantného hluku pozadia. Značný rozdiel hodnôt vidno aj na pozíciách 3, 6 a 9, ktoré sú ďaleko od zdroja hluku. Tu je rozdiel hodnôt viac ako 5%. Alternative 3 Alternative 3 is a situation with a maximal amount of the absorption we can realistically place in the classroom (windows, floor, blackboard and tables are not absorptive). The average absorption is more then 50%. This alternative is rather uncommon for a classroom and it is given only for a illustration reason. The BKG noise levels distribution is shown in the Figure 7. STI values in the figure.8. Difference of 10% in STI values was found at the s 7, 8, 9. Further, in case of the proper BKG noise assumption, the STI value at the 7, which is directly in front of the speaker is the slightly lower, than the value at the 5, which is situated farer. In case of the background noise from the corridor, the largest difference in speech intelligibility value was observed on the 1 Here the STI would be 22% too high if we would use the constant BKG noise in the simulation. Notable difference appears also at the s 3, 6 and 9, which are far from the noise source. The difference is more than 5%. a) b) Obr. 7: Rozloženie hluku (počítané pre 1kHz a) Alt.3 s oknami, b) Alt.3 s dverami STI alt.3 windows STI alt.3 windows Obr. 8: vplyv hluku pozadia na zrozumiteľnosť reči v triede alt. 3
8 Záver Významný rozdiel nerovnomerného rozloženia hluku pozadia na hodnoty STI bol zistený len na pozíciách veľmi blízko zdroja hluku. Napríklad okná alebo dvere v miestnosti s pohltivosťou viac ako 50%. Veľkosť zdroja sa ukázala dôležitým faktorom ovplyvňujúci hodnoty STI. Veľké zdroje hluku ako sú napríklad okná umiestnené po celej dĺžke triedy umožňuje použiť pre triedy s pohltivosťou do 20% konštantný hluk pozadia pre celú triedu. Z výsledkov tiež vyplýva, že aj relatívne malé zdroje hluku v relatívne zvukovo pohltivej miestnosti ovplyvňujú nerovnomernosť hluku pozadia. Tiež treba záverom spomenúť, že by bola vhodná softvérová úprava, v ktorej by bolo možné rozlíšiť zdroj zvuku od zdroja šumu, čo by značne zjednodušilo a urýchlilo simulácie bez nutnosti deliť ich na dve fázy. Poďakovanie Autori vyslovujú poďakovanie za experimentálne výsledky merania šumu pozadia hodnotenej triedy na SvF STU v Bratislave Ing. M. Pavčekovej, Ing. M. Kamenickému a Ing. M. Lukačovičovi Literatúra: [1] Vargová, A., Minarovičová, K., Rychtáriková, M. Nijs, L.: Statistical analysis of the sound in the classroom during teaching process, Proceedings in: Buildings and Environment, November 2007 [2] Dlhý, D.: Vplyv skladby drevených dverí na ich nepriezvučnosť, Proceedings in: 2nd International Symposium MAP 2006, Zvolen, Slovakia, September 2006 Conclusion Significant effect of the unequal distribution of the background noise to the STI values was observed only for the s very close to the source of the noise, e.g. the windows or the door in the room with more then 50 % of absorption. Size of the source was proved to be an important factor concerning the distribution of the sound. The big noise sources like windows, placed on whole length of the classroom allows in the classroom with the average absorption more than 20% usage of single BKG noise value all over the s. It can be concluded that in case of relatively small noise sources in relatively absorptive conditions, it might be reasonable to use proper, dependent values of the BKG noise. In such a cases it would be also nice if software would recognize the signal sources and noise sources separately, what would save time to user by splitting the calculation in two parts. Acknowledgements Authors pronounces thanks for the experimental results of measuring of background noise in classrooms at SvF STU Bratislava to Monika Pavčeková, Milan Kamenický and Michal Lukačovič. References: [3] G. Vermeir, J. Van den Bergh, Classroom acoustics in Belgian schools: requirements analysis, design, Research in Building Physics, Lisse, Swets & Zeitlinger, ISBN , (2003) [4] J. M. Steeneken and T. Houtgast, A physical method for measuring speech-transmission quality (1979) J. Acoust. Soc. Am 107 (2)
Sledovanie čiary Projekt MRBT
VYSOKÉ UČENÍ TECHNIC KÉ V BRNĚ BRNO UNIVERSITY OF T ECHNOLOGY FAKULTA ELEKTROTECHNIKY A KOMUNIKAČNÍCH TECHNO LOGIÍ ÚSTAV AUTOMATIZA CE A MĚŘÍCÍ TECHNIKY FACULTY OF ELECTRICAL ENGINEERING AND COMUNICATION
More informationVYSOKÉ UČENÍ TECHNICKÉ V BRNĚ BRNO UNIVERSITY OF TECHNOLOGY
VYSOKÉ UČENÍ TECHNICKÉ V BRNĚ BRNO UNIVERSITY OF TECHNOLOGY FAKULTA STAVEBNÍ ÚSTAV BETONOVÝCH A ZDĚNÝCH KONSTRUKCÍ FACULTY OF CIVIL ENGINEERING INSTITUTE OF CONCRETE AND MASONRY STRUCTURES PRIESTOROVÝ
More informationDynamic sound source for simulating the Lombard effect in room acoustic modeling software
Dynamic sound source for simulating the Lombard effect in room acoustic modeling software Jens Holger Rindel a) Claus Lynge Christensen b) Odeon A/S, Scion-DTU, Diplomvej 381, DK-2800 Kgs. Lynby, Denmark
More informationKozmické poasie a energetické astice v kozme
Kozmické poasie a energetické astice v kozme De otvorených dverí, Košice 26.11.2008 Ústav experimentálnej fyziky SAV Košice Oddelenie kozmickej fyziky Karel Kudela kkudela@kosice.upjs.sk o je kozmické
More informationDirect and Reflected: Understanding the Truth with Y-S 3
Direct and Reflected: Understanding the Truth with Y-S 3 -Speaker System Design Guide- December 2008 2008 Yamaha Corporation 1 Introduction Y-S 3 is a speaker system design software application. It is
More informationSPEECH INTELLIGIBILITY and Fire Alarm Voice Communication Systems
SPEECH INTELLIGIBILITY and Fire Alarm Voice Communication Systems WILLIAM KUFFNER, M.A. Sc., P.Eng, PMP Senior Fire Protection Engineer Director Fire Protection Engineering October 30, 2013 Code Reference
More informationAcoustical Design of Rooms for Speech
Construction Technology Update No. 51 Acoustical Design of Rooms for Speech by J.S. Bradley This Update explains the acoustical requirements conducive to relaxed and accurate speech communication in rooms
More information: Architectural Lighting : Interiérové svietidlá
SEC Lighting : Architectural Lighting : nteriérové svietidlá : Shape Harmony : Tradition The company SEC accepts with enthusiasm the challenges of continuously changing world. n our opinion, luminaries
More informationCONTEMPORARY POSSIBILITIES OF MODELING OF THE PROBLEMS OF VEHICLE TRACK INTERACTION
ROCZNIKI INŻYNIERII BUDOWLANEJ ZESZYT 8/2008 Komisja Inżynierii Budowlanej Oddział Polskiej Akademii Nauk w Katowicach CONTEMPORARY POSSIBILITIES OF MODELING OF THE PROBLEMS OF VEHICLE TRACK INTERACTION
More informationLV5WDR Wireless Display Receiver Rýchla príručka
LV5WDR Wireless Display Receiver Rýchla príručka 1 1. Predstavenie Wireless display receiver S Wireless display receiver (ďalej len WDR) môžete jednoducho zobrazovať multimediálny obsah (videá, fotografie,
More informationNávod k použití: Boxovací stojan DUVLAN s pytlem a hruškou kód: DVLB1003
Návod na použitie: Boxovací stojan DUVLAN s vrecom a hruškou kód: DVLB1003 Návod k použití: Boxovací stojan DUVLAN s pytlem a hruškou kód: DVLB1003 User manual: DUVLAN with a boxing bag and a speed bag
More informationAirborne Sound Insulation
Airborne Sound Insulation with XL2-TA Sound Level Meter This application note describes the verification of the airborne sound insulation in buildings with the XL2-TA Sound Level Meter. All measurements
More informationACOUSTIC DESIGN - ROOMS FOR SPEECH
Auckland Christchurch Kuala Lumpur Melbourne Sydney Wellington www.marshallday.com ACOUSTIC DESIGN - ROOMS FOR SPEECH EVER BEEN AT A LECTURE OR CONFERENCE AND FOUND IT DIFFICULT TO UNDERSTAND WHAT IS BEING
More informationPORUCHY A OBNOVA OBALOVÝCH KONŠTRUKCIÍ BUDOV - Podbanské 2012
PORUCHY A OBNOVA OBALOVÝCH KONŠTRUKCIÍ BUDOV Podbanské 2012 CIEĽ A ZAMERANIE KONFERENCIE : Cieľom konferencie je poskytnúť priestor pre prezentovanie nových a aktuálnych výsledkov vedeckej a výskumnej
More informationAcoustic design according to room type
according to room type The purpose of the room is decisive for the acoustic environment to be created. In rooms for speech, such as classrooms and auditoriums, it is important to ensure a good level of
More informationCharacterization of acoustics in open offices - four case studies
Characterization of acoustics in open offices - four case studies J. S Keränen, P. Virjonen and V. O Hongisto Finnish Institute of Occupational Health, Lemminkäisenkatu 14-18 B, 5 Turku, Finland jukka.keranen@ttl.fi
More informationMôže sa to stať aj Vám - sofistikované cielené hrozby Ján Kvasnička
Môže sa to stať aj Vám - sofistikované cielené hrozby Ján Kvasnička Territory Account Manager Definícia cielených hrozieb Široký pojem pre charakterizovanie hrozieb, cielených na špecifické entity Často
More informationAcoustic design of schools: performance standards. From 2003 to 2014: a brief guide to the changes in BB 93. by Jack Harvie-Clark, 9th January 2015
Acoustic design of schools: performance standards From 2003 to 2014: a brief guide to the changes in BB 93. by Jack Harvie-Clark, 9th January 2015 This document should be read in conjunction with the new
More informationAcoustical Design for Concert Hall in the Science and Art Centre of Xiamen University
Acoustical Design for Concert Hall in the Science and Art Centre of Xiamen University Yuezhe Zhao, Shuoxian Wu State Key Laboratory of Subtropical Building Sciences, South China University of Technology,
More informationhearing products and acoustic regulations in school 1+1 could equal 3, if a classroom is acoustically regulated when using hearing systems
hearing products and acoustic regulations in school 1+1 could equal 3, if a classroom is acoustically regulated when using hearing systems By Anna K Lejon, November 2014 Anna Karlsson Lejon has a master's
More information2011-06-13. Acoustic design with wall acoustic solutions
2011-06-13 Acoustic design with wall acoustic solutions Introduction A suspended ceiling is by far the most common acoustical treatment in a room. In most cases this is also a sufficient solution to create
More informationING (L) Société d Investissement à Capital Variable 3, rue Jean Piret, L-2350 Luxembourg R.C.S.: Luxembourg B č. 44.873 (ďalej ako spoločnosť )
ING (L) Société d Investissement à Capital Variable 3, rue Jean Piret, L-2350 Luxembourg R.C.S.: Luxembourg B č. 44.873 (ďalej ako spoločnosť ) Oznam pre akcionárov 1) Správna rada spoločnosti rozhodla
More informationAcoustical Design of a Multi-Purpose Hall for Natural and Amplified Sound
Acoustical Design of a Multi-Purpose Hall for Natural and Amplified Sound Dirun Ergin Talayman Acoustics Ltd, Istanbul, Turkey. Zerhan Yüksel Can Yıldız Technical University, Istanbul, Turkey. Summary
More informationVIRTUAL SPACE 4D PROJECT: THE ROOM ACOUSTICAL TOOL. J. Keränen, P. Larm, V. Hongisto
VIRTUAL SPACE 4D PROJECT: THE ROOM ACOUSTICAL TOOL David Oliva University of Turku Department of Physics FIN-20014 Turku, Finland. david.elorza@ttl.fi J. Keränen, P. Larm, V. Hongisto Finnish Institute
More informationOSOBNOSTNÉ ASPEKTY ZVLÁDANIA ZÁŤAŽE
OSOBNOSTNÉ ASPEKTY ZVLÁDANIA ZÁŤAŽE Katarína Millová, Marek Blatný, Tomáš Kohoutek Abstrakt Cieľom výskumu bola analýza vzťahu medzi osobnostnými štýlmi a zvládaním záťaže. Skúmali sme copingové stratégie
More informationAcoustics of indoor sports halls and gymnasia
Acoustics of indoor sports halls and gymnasia Robert Conetta 1, Bridget Shield 1, Trevor Cox 2, Charlie Mydlarz 2, Julie Dockrell 3, Daniel Connolly 3 1 London South Bank University 2 University of Salford
More informationDESIGN CRITERIA FOR ACOUSTIC ENHANCEMENT SYSTEMS Ben Kok, Wim Prinssen Systems for Improved Acoustic Performance Uden, The Netherlands
DESIGN CRITERIA FOR ACOUSTIC ENHANCEMENT SYSTEMS Ben Kok, Wim Prinssen Systems for Improved Acoustic Performance Uden, The Netherlands ABSTRACT Acoustic Enhancement Systems have evolved significantly -
More informationROČNÍK 43 ČÍSLO 4. psychológia a patopsychológia
ROČNÍK 43 ČÍSLO 4 psychológia a patopsychológia VÝSKUMNÝ ÚSTAV DETSKEJ PSYCHOLÓGIE A PATOPSYCHOLÓGIE BRATISLAVA 2008 Redakčná rada: F. Baumgartner, Spoločenskovedný ústav SAV, Košice J. Dan, Pedagogická
More informationAffordable Sports Halls
Creating a sporting habit for life Appendix 5 Acoustics (To be read in conjunction with the main document) Speech Intelligibility with 40dBA Ambient Noise (BB93 Compliant) Affordable Sports Halls August
More informationCASE STUDY. Sarakasi Theatre Nairobi, Kenya Room Acoustical Measurements and Modelling. Africa Room Acoustics DIRAC and ODEON
CASE STUDY Sarakasi Theatre Nairobi, Kenya Room Acoustical Measurements and Modelling Africa Room Acoustics DIRAC and ODEON In November 2008, room acoustical measurements were performed inside the Sarakasi
More informationAircraft cabin noise synthesis for noise subjective analysis
Aircraft cabin noise synthesis for noise subjective analysis Bruno Arantes Caldeira da Silva Instituto Tecnológico de Aeronáutica São José dos Campos - SP brunoacs@gmail.com Cristiane Aparecida Martins
More informationProjekt KEGA Vyučovanie fyziky programovaním modelov fyzikálnych javov a pomocou interaktívneho softvéru
Projekt KEGA Vyučovanie fyziky programovaním modelov fyzikálnych javov a pomocou interaktívneho softvéru Teória relativity s príkladmi Učebný text Jozef Hanč Slavomír Tuleja Košice 2008 Autori: RNDr. Jozef
More informationŠTUDIJNÝ ODBOR PRIEMYSELNÉ INŽINIERSTVO NA VYSOKÝCH ŠKOLÁCH FIELD OF STUDY INDUSTRIAL ENGINEERING AT SCHOOLS OF HIGHER EDUCATION
ŠTUDIJNÝ ODBOR PRIEMYSELNÉ INŽINIERSTVO NA VYSOKÝCH ŠKOLÁCH FIELD OF STUDY INDUSTRIAL ENGINEERING AT SCHOOLS OF HIGHER EDUCATION Renáta TURISOVÁ Stela BESLEROVÁ Abstract This paper deals with the field
More informationPostup pre zistenie adries MAC a vytvorenie pripojenia. v OS Windows
1 Postup pre zistenie adries MAC a vytvorenie pripojenia v OS Windows Obsah: a) Zistenie hardwarovych adries MAC Windows 10 str. 2 Windows 8.1 str. 4 Windows 7 str. 6 Windows Vista str. 8 Windows XP str.
More informationPracovná skupina 1 Energetický management a tvorba energetických plánov mesta
Pracovná skupina 1 Energetický management a tvorba energetických plánov mesta Metodológia a podpora poskytovaná v rámci Dohovoru primátorov a starostov Skúsenosti českých miest Skúsenosti mesta Litoměřice
More information5th Congress of Alps-Adria Acoustics Association NOISE-INDUCED HEARING LOSS
5th Congress of Alps-Adria Acoustics Association 12-14 September 2012, Petrčane, Croatia NOISE-INDUCED HEARING LOSS Davor Šušković, mag. ing. el. techn. inf. davor.suskovic@microton.hr Abstract: One of
More informationWorkshop Perceptual Effects of Filtering and Masking Introduction to Filtering and Masking
Workshop Perceptual Effects of Filtering and Masking Introduction to Filtering and Masking The perception and correct identification of speech sounds as phonemes depends on the listener extracting various
More informationTesting FM Systems on the FP35 Hearing Aid Analyzer -1-
Testing FM Systems on the FP35 Hearing Aid Analyzer -1- Testing FM Systems on the FP35 Hearing Aid Analyzer Introduction This workbook describes how to test FM systems with the FP35 Hearing Aid Analyzer
More informationROOM ACOUSTIC PREDICTION MODELLING
XXIII ENCONTRO DA SOCIEDADE BRASILEIRA DE ACÚSTICA SALVADOR-BA, 18 A 21 DE MAIO DE 2010 ROOM ACOUSTIC PREDICTION MODELLING RINDEL, Jens Holger Odeon A/S, Scion DTU, Diplomvej 381, DK-2800 Kgs. Lyngby,
More informationClassroom acoustics design guidelines based on the optimization of speaker conditions
Classroom acoustics design guidelines based on the optimization of speaker conditions David Pelegrin-Garcia Laboratory of Acoustics and Thermal Physics, Katholieke Universiteit Leuven, Heverlee, Belgium
More informationTHE MARIA REGINA DELLA PACE CHURCH IN PERUGIA: ACOUSTIC MEASUREMENTS AND CORRECTION DESIGN
THE MARIA REGINA DELLA PACE CHURCH IN PERUGIA: ACOUSTIC MEASUREMENTS AND CORRECTION DESIGN Cinzia Buratti*, Rita Mariani, Irene Costarelli Department of Industrial Engineering, Perugia University, Via
More informationConference Phone Buyer s Guide
Conference Phone Buyer s Guide Conference Phones are essential in most organizations. Almost every business, large or small, uses their conference phone regularly. Such regular use means choosing one is
More informationWLA-5000AP. Quick Setup Guide. English. Slovensky. Česky. 802.11a/b/g Multi-function Wireless Access Point
802.11a/b/g Multi-function Wireless Access Point Quick Setup Guide 1 5 Česky 9 Important Information The AP+WDS mode s default IP address is 192.168.1.1 The Client mode s default IP is 192.168.1.2 The
More informationSound Power Measurement
Sound Power Measurement A sound source will radiate different sound powers in different environments, especially at low frequencies when the wavelength is comparable to the size of the room 1. Fortunately
More informationAcoustic analysis by computer simulation for building restoration
Acoustic analysis by computer simulation for building restoration Enrico Dassori & Tiziana Ottonello Istituto di Architettura e tecnica Urbanistica (IATU), Università di Genova Architecture and town planing
More informationWhite Paper Effective Audio For Video Conferencing. January 2013. S. Ann Earon, Ph.D. President, Telemanagement Resources International Inc.
White Paper Effective Audio For Video Conferencing January 2013 S. Ann Earon, Ph.D. President, Telemanagement Resources International Inc. 2013 ClearOne Inc. All rights reserved. No part of this document
More information>1@$UFKLWHFWXUHDFRXVWLFVPHDVXUHPHQWVDQGGHVLJQDFKXUFK DQGDQDXGLWRULXP
7KHQG,QWHUQDWLRQDO&RQJUHVVDQG([SRVLWLRQRQ1RLVH&RQWURO(QJLQHHULQJ -HMX,QWHUQDWLRQDO&RQYHQWLRQ&HQWHU6HRJZLSR.RUHD $XJXVW >1@$UFKLWHFWXUHDFRXVWLFVPHDVXUHPHQWVDQGGHVLJQDFKXUFK DQGDQDXGLWRULXP First Author:
More informationIBM Security Framework: Identity & Access management, potreby a riešenia.
Juraj Polak IBM Security Framework: Identity & Access management, potreby a riešenia. Nová doba inteligentná infraštruktúra Globalizácia a globálne dostupné zdroje Miliardy mobilných zariadení s prístupom
More informationAcoustics of Modern and Old Museums
Denver, Colorado NOISE-CON 2013 2013 August 26-28 Acoustics of Modern and Old Museums António P.O. Carvalho Hélder J.S. Gonçalves Luísa M.M. Garcia Laboratory of Acoustics, College of Engineering, University
More informationAcoustic design according to room shape
Acoustic design according to room shape The shape of the room defines the movement of the sound waves within the room. Placement of acoustic materials should be determined by the way the sound moves in
More informationFunctional Communication for Soft or Inaudible Voices: A New Paradigm
The following technical paper has been accepted for presentation at the 2005 annual conference of the Rehabilitation Engineering and Assistive Technology Society of North America. RESNA is an interdisciplinary
More informationTHE ACOUSTIC DESIGN OF THE NEW DRAMA HOUSE FOR THE ROYAL THEATRE IN COPENHAGEN
THE ACOUSTIC DESIGN OF THE NEW DRAMA HOUSE FOR THE ROYAL THEATRE IN COPENHAGEN A C Gade B Mortensen Gade & Mortensen Akustik A/S, Charlottenlund, Denmark,acg@gade-mortensen.dk Gade & Mortensen Akustik
More informationWelcome Contents Back 1
Welcome Contents Back 1 Attractive room acoustic design for multi-purpose halls H. Drotleff, X. Zhou 1. Introduction Multi-purpose halls serve various uses, e.g., open plan offices, conferences, exhibitions,
More information10EaZy SW White Paper Choosing the right hardware
10EaZy SW White Paper Choosing the right hardware Selecting proper hardware for the 10EaZy SW This white paper describes important elements to consider before purchasing hardware intended for sound level
More informationFEEDBACK FROM THE FOODCOURT
FEEDBACK FROM THE FOODCOURT Evert de Ruiter Peutz consulting engineers, P.O. Box 696, 2700 AR Zoetermeer, The Netherlands e-mail: e.deruiter@peutz.nl; ephjderuiter@gmail.com Yuliya Smyrnova, Tom Brown
More informationAcoustic Terms, Definitions and General Information
Acoustic Terms, Definitions and General Information Authored by: Daniel Ziobroski Acoustic Engineer Environmental and Acoustic Engineering GE Energy Charles Powers Program Manager Environmental and Acoustic
More informationPrestige 660HN-T3A Príručka k rýchlej inštalácii splittra a smerovača (routra)
Prestige 660HN-T3A Príručka k rýchlej inštalácii splittra a smerovača (routra) Volajte na našu zákaznícku linku: 02/208 28 208 Prestige 660HN-T3A Príručka k rýchlej inštalácii splittra a smerovača (routra)
More informationDoppler Effect Plug-in in Music Production and Engineering
, pp.287-292 http://dx.doi.org/10.14257/ijmue.2014.9.8.26 Doppler Effect Plug-in in Music Production and Engineering Yoemun Yun Department of Applied Music, Chungwoon University San 29, Namjang-ri, Hongseong,
More informationEurópska komisia stanovuje ambiciózny akčný program na podporu vnútrozemskej vodnej dopravy
IP/06/48 Brusel 17. januára 2006 Európska komisia stanovuje ambiciózny akčný program na podporu vnútrozemskej vodnej dopravy Komisia dnes navrhla viacročný akčný program s cieľom podporiť rozvoj prepravy
More information10ème Congrès Français d'acoustique Lyon, 12-16 Avril 2010
10ème Congrès Français d'acoustique Lyon, 12-16 Avril 2010 Intelligibility prediction in rolling stocks using ray tracing method Gregory Lemaire 1, Per Trojgaard Andersen 2 1 Lloyd s Register ODS France
More informationActive noise control in practice: transformer station
Active noise control in practice: transformer station Edwin Buikema 1 ; Fokke D. van der Ploeg 2 ; Jan H. Granneman 3 1, 2, 3 Peutz bv, Netherlands ABSTRACT Based on literature and extensive measurements
More informationRychlý průvodce instalací Rýchly sprievodca inštaláciou
CZ SK Rychlý průvodce instalací Rýchly sprievodca inštaláciou Intuos5 Poznámka: chraňte svůj tablet. Vyměňujte včas hroty pera. Bližší informace najdete v Uživatelském manuálu. Poznámka: chráňte svoj
More informationKONTAKT CHEMIE Kontakt PCC
Cleaner and flux remover for printed circuit boards KONTAKT CHEMIE Kontakt PCC Technical Data Sheet KONTAKT CHEMIE Kontakt PCC Page 1/2 Description: Mixture of organic solvents. General properties and
More informationLEED Pilot Credit Library
Applicable Rating Systems >> Requirements >> Submittals >> Additional Questions >> Background Information >> Changes >> Applicable Rating Systems This credit is available for pilot testing by the following
More informationUsing FM. A guide for children and their families on how to use an FM solution with hearing aids
Using FM A guide for children and their families on how to use an FM solution with hearing aids Congratulations on your new FM solution!! This booklet tells you how to use your FM solution, where to use
More informationTuning Subwoofers - Calibrating Subwoofers
Tuning Subwoofers - Calibrating Subwoofers WHY The purpose of a subwoofer is to fill in the bottom octaves below the capabilities of the mains speakers. There are many reasons to use a subwoofer to do
More informationROOM ACOUSTICS DESIGN. Room Acoustics Design Intent: Appropriate Articulation
ROOM ACOUSTICS DESIGN http://mikebm.files.wordpress.com/2008/06/walt-disney-hall-1.jpg Ball State Architecture ENVIRONMENTAL SYSTEMS 1 Grondzik 1 Room Acoustics Design Intent: Appropriate Articulation
More informationSYSTEM DESIGN AND THE IMPORTANCE OF ACOUSTICS
SYSTEM DESIGN AND THE IMPORTANCE OF ACOUSTICS n Will your communication or emergency notification system broadcast intelligible speech messages in addition to alarm tones? n Will your system include multiple
More informationAudio Engineering Society. Convention Paper. Presented at the 129th Convention 2010 November 4 7 San Francisco, CA, USA
Audio Engineering Society Convention Paper Presented at the 129th Convention 2010 November 4 7 San Francisco, CA, USA The papers at this Convention have been selected on the basis of a submitted abstract
More informationAcoustical Design and Noise Control in Metro Stations: Case Studies of the Ankara Metro System
BUILDING ACOUSTICS Volume 14 Number 3 2007 Pages 231 249 231 Acoustical Design and Noise Control in Metro Stations: Case Studies of the Ankara Metro System Zühre Sü 1 and Mehmet Çalışkan 2 1 Bilkent University,
More informationRetrofit structural insulated panels (SIPs) increase sound transmission loss of existing single family houses impacted by highway noise
Baltimore, Maryland NOISE-CON 2010 2010 April 19-21 Retrofit structural insulated panels (SIPs) increase sound transmission loss of existing single family houses impacted by highway noise Scott Harvey
More informationaneb Perfektní minulost.
aneb Perfektní minulost. 2013 se v angličtině nazývá Past Perfect. Používáme jej tehdy, potřebujeme-li jasně vyjádřit, že nějaký děj proběhl ještě dříve než minulý děj, o kterém hovoříme. Podívejme se
More informationTECHNOLOGY RESEARCH AND DEVELOPMENT More Than Alarm Anna Kołodziej-Saramak
TECHNOLOGY RESEARCH AND DEVELOPMENT More Than Alarm Anna Kołodziej-Saramak The purpose of the voice alarm systems (VAS) is to inform people about hazards in a possibly efficient way (which, unfortunately,
More informationUnderstanding Sound System Design and Feedback Using (Ugh!) Math by Rick Frank
Understanding Sound System Design and Feedback Using (Ugh!) Math by Rick Frank Shure Incorporated 222 Hartrey Avenue Evanston, Illinois 60202-3696 (847) 866-2200 Understanding Sound System Design and
More informationImpact of Songs and Jingles Used in Advertising on Brand and Product Awareness
Research topic: Impact of Songs and Jingles Used in Advertising on Brand and Product Awareness This research paper forms a part of the master thesis Impact of Songs and Jingles Used in Advertising on Brand
More informationDIAMOND ROOM MEASUREMENT REPORT
DIAMOND ROOM MEASUREMENT REPORT Frequency response Frequencies between 20 and 20.000 Hz are sent out with the same amplitude to be offered to the signalpath. In theory we should receive a straight line
More informationManagement of agricultural production in the conditions of information society
Management of agricultural production in the conditions of information society Riadenie poľnohospodárskej výroby v podmienkach informačnej spoločnosti A. LÁTEČKOVÁ, M. KUČERA Slovak University of Agriculture,
More informationTutorial www.loudsoft.com
Tutorial www.loudsoft.com In this tutorial we show several examples of simple and advanced X-over designs, using FINE X- over. In the first example we create the x-over for two drivers we have previously
More informationOptiffuser. High-performance, high bandwidth lightweight 1D diffuser.
Optiffuser High-performance, high bandwidth lightweight 1D diffuser. General product information The Optiffuser comes in packs of four panels. Two positives and two negatives (see page 5) per package.
More informationSoftware Newsletter April 2016
Contents ArrayCalc V8.8...3 R1 Remote control software V2.16...8 Amplifier firmware V2.04 (D80/D20/10D/30D)...11 ArrayCalc V8.8 d&b ArrayCalc simulation software accurately predicts the performance of
More informationAPPLICATION GUIDE. Subwoofer-Satellite Systems. Using Control SB-210 & SB-2 Subwoofers. System #5 in Stereo
APPLICATION GUIDE Subwoofer- Systems Using Control SB-210 & SB-2 Subwoofers System #5 in Stereo SPL (at 20 Feet): 94 db Continuous (peaks of 104 db) Stereo / Mono Selector: Stereo 4-Ohm / 8-Ohm Selector:
More informationACOUSTICS: The Sounds of Sustainable Design
ACOUSTICS: The Sounds of Sustainable Design Allison McKenzie amckenzie@shp.com COURSE OUTLINE 1. Acoustical Impacts 2. The Acoustical ABCs 3. Design Best Practices 4. Sustainable Certifications Human comfort
More informationGuidelines for video conferencing room acoustics. D14377.01 September 2010
Guidelines for video conferencing room acoustics D14377.01 September 2010 Video conferencing room acoustics Does the audio quality fail to meet your expectations? Do you feel tired when spending longer
More informationTVORBA KOMUNIKAČNEJ KAMPANE S VYUŢITÍM DIGITÁLNYCH MÉDIÍ
Masarykova univerzita Ekonomicko-správní fakulta Študijný odbor: Podnikové hospodárstvo TVORBA KOMUNIKAČNEJ KAMPANE S VYUŢITÍM DIGITÁLNYCH MÉDIÍ Development of Communication Campaign (Utilisation of Digital
More informationRoom Acoustics. Boothroyd, 2002. Page 1 of 18
Room Acoustics. Boothroyd, 2002. Page 1 of 18 Room acoustics and speech perception Prepared for Seminars in Hearing Arthur Boothroyd, Ph.D. Distinguished Professor Emeritus, City University of New York
More informationJEDNOFÁZOVÝ STATICKÝ ELEKTROMER NA VIACSADZBOVÉ MERANIE ČINNEJ ENERGIE
JEDNOFÁZOVÝ STATICKÝ ELEKTROMER NA VIACSADZBOVÉ MERANIE ČINNEJ ENERGIE AMS B1x-xAx Applied Meters, a. s. Budovateľská 50, 080 01 Prešov Tel.: +421-51-758 11 69, Fax: +421-51-758 11 68 Web: www.appliedmeters.com,
More informationGenerating Element. Frequency Response. Polar Pattern. Impedance. Output Level
Generating Element Frequency Response Polar Pattern Impedance Output Level Weight Pro 7: Dynamic Pro 7 ic: ic Electret Pro 7: 100 Hz - 12 khz Pro 7 ic: 35 Hz - 12 khz Pro 7: Heil Cardioid Pro 7 ic: Cardioid
More informationHYUNDAI Phablet HP503Q
HYUNDAI Phablet HP503Q Stručný návod k obsluze Quick start guide Príručka stručným návodom V1.0.0/10/2015/CZ/EN/SK 1 Základní informace Před prvním použitím Vašeho nového přístroje si pozorně přečtěte
More informationConvention Paper Presented at the 118th Convention 2005 May 28 31 Barcelona, Spain
Audio Engineering Society Convention Paper Presented at the 118th Convention 25 May 28 31 Barcelona, Spain 6431 This convention paper has been reproduced from the author s advance manuscript, without editing,
More informationAcoustics & Building Services An back to basics overview
Acoustics & Building Services An back to basics overview Prepared for 20 th March 2012 ASK Consulting Engineers Since 1993, ASK Consulting Engineers has been providing clients from both the private and
More informationHow To Control Noise In A C7 Data Center Server Room
Brigham Young University Acoustical Analysis of Active Control in the Server Room of a C7 Data Centers Colocation Facility Feasibility Report Advisor: Dr. Scott Sommerfeldt C7 Data Centers representative:
More informationCARMEN R in the Norwich Theatre Royal, UK
CARMEN R in the Norwich Theatre Royal, UK C. Rougier a, I. Schmich a, P. Chervin a and P. Gillieron b a CSTB, 24, Rue Joseph Fourier, 38400 Saint Martin D Hères, France b Paul Gillieron Acoustic Design,
More informationCOMPATIBILITY AND SHARING ANALYSIS BETWEEN DVB T AND RADIO MICROPHONES IN BANDS IV AND V
European Radiocommunications Committee (ERC) within the European Conference of Postal and Telecommunications Administrations (CEPT) COMPATIBILITY AND SHARING ANALYSIS BETWEEN DVB T AND RADIO MICROPHONES
More informationACOUSTIC DESIGN CHALLENGE IN TOTALLY FLEXIBLE CONFIGURATION OF THEATRE HALL CASE STUDY
th Congress of Alps-Adria Acoustics Assosiation.-7. October Graz, Austria ISBN: 978---9- ACOUSTIC DESIGN CHALLENGE IN TOTALLY FLEXIBLE CONFIGURATION OF THEATRE HALL CASE STUDY Miomir Mijić, Dragana Šumarac
More informationSpeech Signal Processing: An Overview
Speech Signal Processing: An Overview S. R. M. Prasanna Department of Electronics and Electrical Engineering Indian Institute of Technology Guwahati December, 2012 Prasanna (EMST Lab, EEE, IITG) Speech
More informationaneb Co bylo, bylo, co zbylo, zbylo.
aneb Co bylo, bylo, co zbylo, zbylo. 2013 Minulé časy Minulý čas se vyznačuje především tím, že jím popisované děje jsou již ukončeny a dále neprobíhají. Často jsou tyto skutečnosti naznačeny signálním
More informationBuilding Technology and Architectural Design. Program 4th lecture 9.00-9.45 Case studies Room Acoustics. 10.00 10.45 Case studies Room Acoustics
Building Technology and Architectural Design Program 4th lecture 9.00-9.45 Case studies Room Acoustics 9.45 10.00 Break 10.00 10.45 Case studies Room Acoustics Lecturer Poul Henning Kirkegaard 10-10-2006
More informationODVLHČOVAČ MDF2-12DEN3 MDF2-16DEN3 MDF2-20DEN3 MDN1-10DEN3
ODVLHČOVAČ SK MDF2-12DEN3 MDF2-16DEN3 MDF2-20DEN3 MDN1-10DEN3 OPIS PRÍSTROJA 86 ELEKTRONICKÝ OVLÁDACÍ PANEL 87 MANUÁLNY OVLÁDACÍ PANEL 89 UMIESTNENIE A UVEDENIE DO PREVÁDZKY 90 VYPRÁZDŇOVANIE VODY 91
More informationComparison of the Bass Performance of Passive Open Baffle, U Frame, and H Frame Speakers
Comparison of the Bass Performance of Passive Open Baffle, U Frame, and H Frame Speakers Martin J. King 40 Dorsman Dr. Clifton Park, NY 12065 MJKing57@aol.com Introduction : My first article on OB design,
More informationA Microphone Array for Hearing Aids
A Microphone Array for Hearing Aids by Bernard Widrow 1531-636X/06/$10.00 2001IEEE 0.00 26 Abstract A directional acoustic receiving system is constructed in the form of a necklace including an array of
More information