Distinction between analogue and discrete processes and quantities Conversion of analogue quantities to digital form Using sampling techniques Storage units Digital Data Digital data is represented by ID: 326420
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Slide1
Computer Logic
Distinction between analogue and discrete processes and quantities. Conversion of analogue quantities to digital form. Using sampling techniques. Storage units. Slide2
Digital Data
Digital data is represented by 1s and 0s 1 represents
that the switch is
on
0 represents that the switch is off Digital data (1s and 0s) is known as binary. A computer system only understands digital data Slide3
Analogue Data
Analogue data is represented by analogue signals
An example of analogue data are
sound waves
from our voice Analogue data must be converted to digital data for the computer to understand it.Slide4
Analogue to Digital Data
ATD As we said before analogue signals need to be changed to digital data to be understood by
our computer.
ATD devices
convert analogue signals to digital dataSlide5
Digital Data to Analogue Signals
DTA For us to understand computer language the digital data needs to be converted to analogue
data
DTA
devices convert digital data to analogue signals, ex: modem
Dear
John,Is
it OK if we meet at 6?
10010010
ISP
10010101
Dear John,
Is it OK if we meet at 6?Slide6
Comparing Analogue to Digital devices
Analogue device
Digital
device
Continuous signalVarying valuesValues not rounded upDifficult for precise reading
Not a continuous signal
Values rounded up
Easy and clear to read
Becoming more precise Slide7
Analogue and Digital Graphs
Analogue graph
Digital graph
Changing an Analogue graph to a Digital graph is called
Sampling Slide8
Units of Storage
A computer has many different units of storage The storage units we will be going through today are;
Bits
Bytes
Kilobytes Megabytes GigabytesTerabyte sEach storage unit is made up of a number of bits Slide9
Bit
A bit is the smallest unit of storage within a computer A bit can only store a 1 or a 0
A bit is too small to store anything, hence they are joined to create other
larger storage
units. 1 BitSlide10
Byte
A byte is made up of 8 bits One character is made up of 8 bits, hence 1 byte can hold 1 character. To store the word
byte
you would need 4 bytes
1 Byte
8 BitsSlide11
Kilobytes
Bytes are still very small to store many files so a larger storage unit is used, a Kilobyte1024 bytes are grouped together to create a kilobyte
1 KiloByte
1024 BytesSlide12
Units of Storage
Unit
Equivalent
Bit
(Can only store 0 or 1)
Byte
8 Bits
Kilobyte (KB)
1024 Bytes
Megabyte (MB)
1024 Kilobytes
Gigabyte (GB)
1024 Megabytes
Terabyte (TB)
1024 GigabytesSlide13
Converting Units of Storage
In order to convert small units to large ones we need to divide
If we want to convert 7680 Bytes into KB (smaller to bigger unit
);
1 KB = 1024 Bytes ? KB = 7680 Bytes 7680/1024=7.5KBSlide14
Converting Units of Storage
In order to convert large units to smaller ones we need to multiply If we want to convert 3MB into KB (bigger to smaller unit)
1 MB = 1024 KB
3 MB = ? KB
3 x 1024 = 3072 KBSlide15
More examples to work out
Convert 4MB into kBConvert 5890 Bytes into KB
Convert 2GB
into
KB(round up your answers when needed. eg; 4.6 becomes 4) Slide16
Answers
Convert 4MB into kBMB = 1024 KB
4MB = ? KB
4 x 1024 = 4096MBSlide17
Answers
Convert 5890 Bytes into KB1024 bytes = 1 KB5890 bytes = ? KB
5890/1024 = 6KBSlide18
Answers
Convert 2GB into KB
1 GB = 1024 MB
2 GB = ? MB
1 MB = 1024 KB2048MB = ? KBIf I want to know how many bytes there are in 2GB what would my next step be?
2
x 1024 =
2048MB
2048 x
1024 =
2097152KBSlide19
Some typical storage devices
Device
Storage
Other
Possibilities
Floppy Disk
1.44MB
CD
700MB
DVD
4.7GB
8.7GB, 9.4GB
Pen Drive
8GB
2GB, 4GB, 16GB, 32GB
Blu Ray
25GB
50GB, 100GB
Hard Disk
500GB
1TBSlide20
Home – Work
Handout 02 (form3opt1.blogspot.com)