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Anubhav Sokhal
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Speaker ppt
1.
2.
IINNTTRROODDUUCCTTIIOONN AAnn eelleeccttrroo--aaccoouussttiicc
ttrraannssdduucceerr tthhaatt ccoonnvveerrttss eelleeccttrriiccaall ssiiggnnaallss iinnttoo ssoouunnddss lloouudd eennoouugghh ttoo bbee hheeaarrdd aatt aa ddiissttaannccee.. NNoonn--eelleeccttrriiccaall lloouuddssppeeaakkeerrss wweerree ddeevveellooppeedd aass aacccceessssoorriieess ttoo tteelleepphhoonnee ssyysstteemmss,, bbuutt eelleeccttrroonniicc aammpplliiffiiccaattiioonn bbyy vvaaccuuuumm ttuubbee mmaaddee lloouuddssppeeaakkeerrss mmoorree ggeenneerraallllyy uusseeffuull.. TThhee mmoosstt ccoommmmoonn ffoorrmm ooff lloouuddssppeeaakkeerr uusseess aa ppaappeerr ccoonnee ssuuppppoorrttiinngg aa vvooiiccee ccooiill eelleeccttrroommaaggnneett aaccttiinngg oonn aa ppeerrmmaanneenntt mmaaggnneett..
3.
HHIISSTTOORRYY TThhee ssttaannddaarrdd
ddyynnaammiicc lloouuddssppeeaakkeerr tthhaatt wwee kknnooww ooff ttooddaayy wwaass ddeevveellooppeedd iinn tthhee 11992200''ss aanndd uusseess aa mmaaggnneettiicc ffiieelldd ttoo mmoovvee aa ccooiill oorr mmaaggnneett wwhhiicchh iiss ccoonnnneecctteedd ttoo aa ddiiaapphhrraaggmm.. TThhee ddyynnaammiicc lloouuddssppeeaakkeerr oouuttppeerrffoorrmmss mmaannyy ootthheerr ttyyppeess ooff ssppeeaakkeerrss,, aanndd iiss lloowweerr ccoosstt ttoo pprroodduuccee.. FFoorr tthheessee rreeaassoonnss iitt iiss tthhee mmoosstt ppooppuullaarr..
4.
TTYYPPEESS ►HHoorrnnss ►EElleeccttrrooddyynnaammiicc
LLoouuddssppeeaakkeerr ►FFllaatt PPaanneell SSppeeaakkeerrss ►DDiiaapphhrraaggmm SSppeeaakkeerrss ►PPllaassmmaa AArrcc SSppeeaakkeerrss ►PPiieezzooeelleeccttrriicc SSppeeaakkeerrss
5.
HHOORRNNSS HHoorrnnss wweerree
tthhee eeaarrlliieesstt ffoorrmm ooff aammpplliiffiiccaattiioonn..HHoorrnnss ddoo nnoott uussee eelleeccttrriicciittyy.. TThhee pprroobblleemm wwiitthh hhoorrnnss iiss tthhaatt tthheeyy ccoouulldd nnoott aammpplliiffyy tthhee ssoouunndd vveerryy mmuucchh..HHoorrnnss rreemmaaiinn aa nnoovveellttyy ffoorr ccoolllleeccttoorrss ttooddaayy.. AAuuddiioo RReeccoorrddiinngg ffoorr eenntteerrttaaiinnmmeenntt aanndd rreeccoorrddeedd kkeeeeppiinngg,, llaatteerr oonn ffoorr vvooiiccee rraaddiioo
6.
EELLEECCTTRROODDYYNNAAMMIICC LLOOUUDDSSPPEEAAKKEERR TThhiiss
iiss aa ddeevviiccee tthhaatt uusseess aann eelleeccttrroommaaggnneettiicc ccooiill aanndd ddiiaapphhrraaggmm ttoo ccrreeaattee ssoouunndd.. IItt uusseess aann eelleeccttrroommaaggnneett ttoo ttuurrnn eelleeccttrriicc ssiiggnnaallss ooff vvaarryyiinngg ssttrreennggtthh iinnttoo mmoovveemmeenntt.. TThhiiss iiss tthhee mmoosstt ccoommmmoonn ttyyppee ooff ssppeeaakkeerr iinn tthhee wwoorrlldd ttooddaayy..
7.
FFLLAATTPPAANNEELL SSPPEEAAKKEERRSS FFllaatt
PPaanneell SSppeeaakkeerrss uussee vvooiiccee ccooiillss mmoouunntteedd ttoo ffllaatt ppaanneellss ttoo aacctt aass tthhee ssoouurrccee ooff ssoouunndd.. TThhee ffllaatt ppaanneell aaccttss aass aa ddiiaapphhrraaggmm.. DDiiffffeerreenntt mmaatteerriiaallss ccaann bbee uusseedd aass aa ddiiaapphhrraaggmm ffrroomm vviinnyyll ttoo SSttyyrrooffooaamm ..TTyyppeess ooff ffllaatt ppaanneell ssppeeaakkeerrss:: RRiibbbboonn ssppeeaakkeerr,, PPllaannaarr mmaaggnneettiicc,, EElleeccttrroossttaattiicc..
8.
DDIIAAPPHHRRAAGGMM SSPPEEAAKKEERR DDiiaapphhrraaggmm
SSppeeaakkeerr iiss rreellaatteedd ttoo tthhee eelleeccttrrooddyynnaammiicc lloouuddssppeeaakkeerr iinn tthhaatt iitt uusseess mmaaggnneettiicc ffiieellddss ttoo mmoovvee aann eelleemmeenntt.. TThhiiss ssppeeaakkeerr hhaass tthhee ccooiill ddiirreeccttllyy mmoouunntteedd oonn tthhee ddiiaapphhrraaggmm..
9.
PPLLAASSMMAA AARRCC SSPPEEAAKKEERR
PPllaassmmaa iiss iioonniizzeedd ggaass,, oorr ccuurrrreenntt sseenntt tthhrroouugghh aa ggaass.. PPllaassmmaa iiss rreessppoonnssiivvee ttoo eelleeccttrriiccaall ffiieellddss,, tthheerreeffoorree yyoouu ccaann ttuurrnn eelleeccttrriicc ssiiggnnaall ooff ssoouunndd iinnttoo aann eelleeccttrriicc ffiieelldd wwhhiicchh mmaanniippuullaatteess tthhee ppllaassmmaa..TThhiiss kkiinndd ooff ssppeeaakkeerr iiss iinntteerreessttiinngg bbuutt lliimmiitteedd iinn ssoouunndd qquuaalliittyy..
10.
PPiieezzooeelleeccttrriicc SSppeeaakkeerrss PPiieezzooeelleeccttrriicc
ssppeeaakkeerrss aarree lliimmiitteedd iinn ffrreeqquueennccyy rreessppoonnssee tthheerreeffoorree tthheeyy aarree oonnllyy uusseedd aass ttwweeeetteerrss oorr iinn ssmmaallll eelleeccttrriiccaall ddeevviicceess lliikkee wwaattcchheess//cclloocckkss ttoo mmaakkee ssiimmppllee ssoouunnddss..
11.
SS CC AA
NN NN EE RR CCoommppuutteerr ppeerriipphheerraall ddeevviiccee tthhaatt ccoonnvveerrttss aa ddooccuummeenntt,, ffiillmm,, ggrraapphhiicc,, oorr pphhoottooggrraapphh ttoo aa ddiiggiittaall iimmaaggee,, mmaanniippuullaattee tthhrroouugghh aann aapppprroopprriiaattee ssooffttwwaarree.. WWhheenn uusseedd wwiitthh aann ooppttiiccaall cchhaarraacctteerr rreeccooggnniittiioonn ((OOCCRR)) ssooffttwwaarree,, aa ssccaannnneerr ccaann ccoonnvveerrtt pprriinntteedd,, ttyyppeewwrriitttteenn tteexxtt iinnttoo aa ddiiggiittaall ffiillee tthhaatt ccaann bbee rreeaadd bbyy aa wwoorrdd pprroocceessssoorr..
12.
TTYYPPEESS ►FFllaattbbeedd SSccaannnneerrss
►PPhhoottoo SSccaannnneerrss ►SShheeeett ffeedd SSccaannnneerrss ►PPoorrttaabbllee SSccaannnneerrss
13.
FFLLAATTBBEEDD SSCCAANNNNEERR FFllaattbbeedd
ssccaannnneerrss wwiillll ttaakkee uupp ssoommee ddeesskkttoopp ssppaaccee.. TThheeyy llooookk lliikkee mmiinniiaattuurree pprriinntteerrss wwiitthh aa fflliipp--uupp ccoovveerr pprrootteeccttiinngg tthhee ggllaassss ppllaatteenn TThheessee ssccaannnneerrss aarree ggoooodd ffoorr ssccaannnniinngg tthhee nneewwssppaappeerr,, bbooookk,, pphhoottooggrraapphh;;oorr ffoorr ssccaann bbuullkkyy iitteemmss..
14.
PPHHOOTTOO SSCCAANNNNEERRSS PPhhoottoo
ssccaannnneerrss iinncclluuddee ssppeecciiaalliizzeedd tteecchhnnoollooggyy ssoo tthhaatt tthheeyy ccaann ddeeaall wwiitthh sslliiddeess aanndd nneeggaattiivveess;; tthheeyy aallssoo hhaavvee bbuuiilltt--iinn ssooffttwwaarree ttoo cclleeaann uupp oolldd pphhoottooss.. MMaannyy aallll--ppuurrppoossee ssccaannnneerrss ccaann aallssoo ssccaann pphhoottooss..
15.
SSHHEEEETTFFEEDD SSCCAANNNNEERR SShheeeett
ffeedd ssccaannnneerrss aarree ssmmaalllleerr tthhaann ffllaattbbeedd ssccaannnneerrss.. YYoouu ffeeeedd aa ddooccuummeenntt oorr pphhoottoo iinnttoo tthhee ssccaannnneerr rraatthheerr tthhaann ppllaaccee iitt oonn ttoopp.. IInn tthheessee tthhee oouuttppuutt rreessoolluuttiioonn iinn tthhee pprroocceessss iiss nnoott ggoooodd..
16.
PPOORRTTAABBLLEE SSCCAANNNNEERR PPoorrttaabbllee
ssccaannnneerrss aarree ssmmaallll eennoouugghh ttoo ccaarrrryy wwiitthh uuss.. SSoommee aarree ssmmaallll eennoouugghh lliikkee ffoouunnttaaiinn ppeenn.. TThheessee ssccaannnneerr ssccaann ddooccuummeenntt lliinnee bbyy lliinnee.. ssoo tthheeyy aarree nnoott ggoooodd ffoorr ssccaannnniinngg pphhoottooss oorr ootthheerr hhiigghh ccllaassss rreessuulltt..
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