computer logic distinction between analogue and discrete processes and quantities. conversion of...
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Computer Logic Distinction between analogue and discrete processes and quantities. Conversion of analogue quantities to digital form. Using sampling techniques. Storage units.
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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
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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.
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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 data
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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
ISPISP
10010101Dear John,
Is it OK if we meet at 6?
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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
readBecoming more
precise
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Analogue and Digital Graphs
Analogue graph Digital graph
Changing an Analogue graph to a Digital graph is called Sampling
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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 Gigabytes Terabyte s
Each storage unit is made up of a number of bits
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BitA 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 Bit
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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 Byte8 Bits
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Kilobytes Bytes are still very small to store
many files so a larger storage unit is used, a Kilobyte
1024 bytes are grouped together to create a kilobyte
1 KiloByte
1024 Bytes
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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 Gigabytes
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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=7.5KB
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Converting Units of StorageIn 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 KB
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More examples to work out Convert 4MB into kB
Convert 5890 Bytes into KB
Convert 2GB into KB
(round up your answers when needed. eg; 4.6 becomes 4)
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AnswersConvert 4MB into kB
MB = 1024 KB4MB = ? KB
4 x 1024 = 4096MB
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AnswersConvert 5890 Bytes into KB
1024 bytes = 1 KB5890 bytes = ? KB
5890/1024 = 6KB
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AnswersConvert 2GB into KB
1 GB = 1024 MB 2 GB = ? MB
1 MB = 1024 KB2048MB = ? KB
If I want to know how many bytes there are in 2GB what would my next step be?
2 x 1024 = 2048MB
2048 x 1024 = 2097152KB
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Some typical storage devices
Device Storage Other Possibilities
Floppy Disk 1.44MBCD 700MBDVD 4.7GB 8.7GB, 9.4GBPen Drive 8GB 2GB, 4GB,
16GB, 32GBBlu Ray 25GB 50GB, 100GBHard Disk 500GB 1TB
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Home – Work
Handout 02 (form3opt1.blogspot.com)