Data Resresentation by Hamad

7/25/2019 Data Resresentation by Hamad

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PRESENTATIONBY:


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DATA PRESENTATION& DIGITAL ELECTRINICS


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DATA PRENENTATION

People use computer to work wit

m!"# ki"$ o% $!t! i"clu$i"

"um'ers(

te)tsmusic

potos

*i$eos+


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HOW DOES A COMPUTER REPRESENT DATADIGITALLY

Most computers are digital devices.

A digital device works with binary no. 1 andzero,

As a lighted bulb has two discrete statesZER and !E which mean ! and "" soit is a digital device an analog device workswith the continuous data,

A dimmer switch, on the other handhas a


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.ow $oes ! computer represe"t "um'ers

CO/P0TER REPRESENT DATA DIGITALLY INBINARY NO+ SYSTE/+

Te 'i"!r# "umer!l s#stem or

'!se12 "um'er s#stem

represe"ts "umeric*!lues usi" two s#m'ols( usu!ll# ,!"$ -
http://en.wikipedia.org/wiki/0_(number)http://en.wikipedia.org/wiki/1_(number)http://en.wikipedia.org/wiki/1_(number)http://en.wikipedia.org/wiki/0_(number)


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Decim!l to 'i"!r# "o+ s#stem+


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T#pes o% co$es wic !re use$

Tis %i illustr!te

ow ! computerc!" use , s !"$ - s

to represe"t

te letters !"$

s#m'ols i" te te)t

.I3

Te)t co$esCo$e wic represe"t te letters o%

!lp!'et pu"ctu!tio" m!rks !"$

oter s#m'ols

/ost popul!r co$e s#stems !re

-+ EBCDIC2+ ASSCII

4+ E)te"$e$ ASCII

5+ 0"ico$e


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.ow Does ! computer co"*ert music !"$

picture i"to co$es+

/usic !"$ picture !re "ot sm!ll !"$

$iscrete o"e+

To work wit tese te must 'e $iiti6e+

Te term $iit!li6e me!" to co"*ert te

r!w (!"!lo $!t! i"to $iit!l %orm!t

represe"te$ '# , !"$ -

A potor!p or $r!wi" c!" 'e$iit!li6e$ '# tre!ti" it !s !s ! series o%

color co$e !"$ e!c co$e is !ssi"e$ !

'i"!r# "o +


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Stor!e t#peI"si$e te s#stem u"it7777

.!r$ $ri*e

CD8D9D $ri*eStor!e T#pes77777777777

/!"etic Stor!e

lopp# !"$ .!r$ Dri*e

use m!"et to !ccess $!t!

Optic!l Stor!e

CD !"$ D9D $ri*es

use l!ser 'e!m to !ccess $!t!


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Stor!e t#pe

/!"etic Stor!e

Disk $ri*es( .!r$ Disk Dri*es( i c!p!cit# %lopp# $isk $ri*es

!"$ t!pe $ri*es !"$ m!"etic t!pe !re co!te$ wit !m!"etic!ll# se"siti*e m!teri!l

Tis speci!l co!ti" e"!'les tem to store $!t!

Optic!l Stor!e

Optic!l stor!e $e*ices use l!sers to re!$ $!t! %rom !"$ write$!t! to te re%lecti*e sur%!ce o% !" optic!l $isk

CD1RO/ $ri*e is t#pe o% optic!l stor!e


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.ow $oes m!"etic stor!e works+/!"etic stor!e

store $!t! '# m!"eti6i" te

microscopic p!rticles o" te $isk

or t!pe sur%!ce+

re!$ ; write e!$ mec!"isms i"te $isk $ri*e re!$ !"$ write te

m!"eti6e$ p!rticle t!t represe"t

$!t! +

i+ will e)pl!i" ow ! computer

store o" m!"etic me$i!+


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.ow $oes optic!l stor!e worksCD !"$ D9D $ri*es !re Optic!l

Stor!e + It is possi'le to see te $!t!

usi" te i power microscope+

D!t! store i" %orm o% pits !"$ l!"$wic sow , !"$ - respecti*el# t!t

represe"t te $!t! +A low power L!ser is use$ to re!$ te

$!t!+

Te sur%!ce o% !" optic!l $isk is co!te$wit cle!r pl!stic( m!ki" te $isk

$ur!'le+


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A"#

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Data Resresentation by Hamad