White Blood Cells Prepared by Dr. Hamad ALAssaf [email protected] 2015.
Data Resresentation by Hamad
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Transcript of 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"#