1Date: 01-09-2007Session : Chapter 9Topic : Input/Output DevicesFaculty : nnapurna ! !atil Depart"ent o# CS$ % S &a"aiah Institute o# Technolo'y (an'alore$ "ail: annapurnap2)"srit*e+u annapurnap2)yahoo*co"CC$-$D,ST S$SSIO- FO& CO%!,T$& F,-D%$-T.S2CO-T$-TSIntroductionInput DevicesKeyboard,mouse,joystick,scanners,digital camera, bar code reader, touch Sreeen,Speech input device (microphone)utput Devices!onitor , Speaker, "rinters ( di##erent types)/1*Intro+uction01hat2s availa3le #or input45touch - #in'ers6 #eet6 3reath5soun+ - voice6 other soun+s5'esture5'a7e53rain8aves49an+ output45te:tual in#or"ation5visual i"a'es - photos6 +ia'ra"s6 icons5"ovin' i"a'es5soun+s - "usic6 voice5$tc**;2*Input Devices5,se+ 3y a person to co""unicate to a co"puter*Person to computer7Output Devices5Displays in#or"ation #ro" the co"puter to a person*eselections#ro"thescreen*"ousehas one to #ive 3uttons* The 3otto" o# the "ouse is #lat an+ contains a "echanis" that +etects "ove"ent o# the "ouse*10!ointin' +evices - +irect5Touch screens19Touch screens5O#ten use+ #or applications 8ith occasional use6 #or e:a"ple5(an> T%s6 In#or"ation =ios>s6 etc*5-o e:tra har+8are - use+ #or input an+ #or output5Can 3e precise to 1 pi:el5?oo+ #or "enu choice - not so 'oo+ #or other #unctions5Intuitive to use1;Touch screens5(,T5Tirin' i# at 8ron' an'le @nee+s to 3e /0-09A #ro" hori7ontalB5?et 'reasy6 Ca""y5Fin'er can o3scure screen5lternative - use stylus to touch screen6 or li'htpen17In+irect !ointin' Devices5-ee+ "ore co'nitive processin' than +irect "etho+s6 3ut can 3e "ore e##icient5"ouse5trac>er 3all5trac> point5touchpa+41 is to play co"puter 'a"es 3y controllin' the 8ay that so"ethin' "oves on the screen* 20%icrophones - Speech &eco'nition5,se a "icrophone to tal> to your co"puter 5++ a soun+ car+ to your co"puter5Soun+ car+ +i'iti7es au+io input into 0/1s 5 speech reco'nition pro'ra" canprocess the input an+ convert it into "achine-reco'ni7e+ co""an+s orinput 21u+io Input: Speech &eco'nition5Speech recognition is a type o# input in 8hich the co"puter reco'ni7es 8or+s spo>en into a "icrophone*5Special so#t8are an+ a "icrophone are reEuire+*5.atest technolo'y uses continuous speech reco'nition 8here the user +oes not have to pause 3et8een 8or+s*22%icrophones - Speech &eco'nition2/ Di'ital ca"eraAdigitalcameracanstore"any"ore picturesthananor+inaryca"era*!ictures ta>enusin'a+i'italca"eraarestore+insi+e its"e"oryan+can3etrans#erre+toa co"puter3yconnectin'theca"eratoit* +i'ital ca"era ta>es pictures 3y convertin' the li'ht passin' throu'h the lens at the #ront into a +i'ital i"a'e* 20 Scannerscannercan3euse+toinputpicturesan+ te:t into a co"puter* There are t8o "ain types o# scannerF Gan+-hel+ an+ Flat-3e+* 29 .i'ht pen5li'htpenisas"allHpen-shape+28an+6 8hich contains li'ht sensors* 5Itisuse+tochooseo3Cectsorco""an+son thescreeneither3ypressin'ita'ainstthe sur#aceo#thescreenor3ypressin'as"all s8itch on its si+e* 5si'nalissenttotheco"puter68hichthen 8or>souttheli'htpen2se:actlocationonthe screen* 5The a+vanta'e o# a li'ht pen is that it +oesn2t nee+ a special screen or screen coatin'* 2; (ar co+es5 3ar co+e is a set o# lines o# +i##erent thic>nesses that represent a nu"3er5(ar Co+e &ea+ers are use+ to input +ata #ro" 3ar co+es* %ost pro+ucts in shops have 3ar co+es on the"5(ar co+e rea+ers 8or> 3y shinin' a 3ea" o# li'ht on the lines that "a>e up the 3ar co+e an+ +etectin' the a"ount o# li'ht that is re#lecte+ 3ac>2 Det !rinterJ least e:pensive6 color6 slo8er 8ith a hi'her per pa'e cost than laser printers 5.aser!rinterJ%ore e:pensive6 #aster6 lo8er per pa'e cost than in> Cet6 /9!rinters5 printer is a peripheral +evice that pro+uces a physical copy or hard copy o# the co"puter2s output*/;InkjetLaserTypes o# !rinters5"n#$et printer6 also calle+ a 3u33le-Cet6 "a>es characters 3y insertin' +ots o# in> onto paper5.etter-Euality printouts 5Cost o# printer is ine:pensive 3ut in> is costly5Laser printer 8or>s li>e a copier 5Muality +eter"ine+ 3y +ots per inch @+piB pro+uce+5Color printers availa3le 5$:pensive initial costs 3ut cheaper to operate per pa'e/7!lotter5 plotter is a printer that uses a pen that "oves over a lar'e revolvin' sheet o# paper*5It is use+ in en'ineerin'6 +ra#tin'6 "ap "a>in'6 an+ seis"olo'y*/ers5u+io output is the a3ility o# the co"puter to output soun+*5T8o co"ponents are nee+e+:J Sound card J !lays contents o# +i'iti7e+ recor+in'sJ Spea#ers J ttach to soun+ car+/9Su""aryIntroductionInput DevicesKeyboard,mouse,joystick,scanners,digital camera, bar code reader, touch Sreeen,Speech input device (microphone)utput Devices!onitor , Speaker, "rinters ( di##erent types)00TG-= NO,