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Computer Logic

Computer Logic. 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 1s and 0s 1 represents that the switch is on

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Computer Logic

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  1. Computer Logic Distinction between analogue and discrete processes and quantities. Conversion of analogue quantities to digital form. Using sampling techniques. Storage units.

  2. 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

  3. 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.

  4. 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

  5. 10010010 Dear John,Is it OK if we meet at 6? ISP 10010101 Dear John, Is it OK if we meet at 6? 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

  6. Analogue device Digital device • Continuous signal • Varying values • Values not rounded up • Difficult for precise reading • Not a continuous signal • Values rounded up • Easy and clear to read • Becoming more precise Comparing Analogue to Digital devices

  7. Analogue graph Digital graph Analogue and Digital Graphs Changing an Analogue graph to a Digital graph is called Sampling

  8. 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

  9. 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 Bit

  10. 8 Bits 1 Byte 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

  11. 1024 Bytes 1 KiloByte 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

  12. Units of Storage

  13. 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

  14. 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 KB

  15. 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)

  16. Answers • Convert 4MB into kB MB = 1024 KB 4MB = ? KB 4 x 1024 = 4096MB

  17. Answers • Convert 5890 Bytes into KB 1024 bytes = 1 KB 5890 bytes = ? KB 5890/1024 = 6KB

  18. Answers • Convert 2GB into KB 1 GB = 1024 MB 2 GB = ? MB 1 MB = 1024 KB 2048MB = ? 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

  19. Some typical storage devices

  20. Home – Work • Handout 02 (form3opt1.blogspot.com)

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