Computer Logic Distinction between analogue and discrete processes

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 1 s and 0 s � 1 represents that the switch is on � 0 represents that the switch is off �Digital data (1 s and 0 s) is known as binary. � A computer system only understands digital data

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.

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

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 1001 0010 Dear John, Is it OK if we meet at 6? ISP Dear John, Is it OK if we meet at 6? 1001 0101

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

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

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

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

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 8 Bits 1 Byte

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 1024 Bytes 1 Kilo. Byte

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

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. 5 KB

Converting Units of Storage �In order to convert large units to smaller ones we need to multiply �If we want to convert 3 MB into KB (bigger to smaller unit) 1 MB = 1024 KB 3 MB = ? KB 3 x 1024 = 3072 KB

More examples to work out �Convert 4 MB into k. B �Convert 5890 Bytes into KB �Convert 2 GB into KB (round up your answers when needed. eg; 4. 6 becomes 4)

Answers �Convert 4 MB into k. B MB = 1024 KB 4 MB = ? KB 4 x 1024 = 4096 MB

Answers �Convert 5890 Bytes into KB 1024 bytes = 1 KB 5890 bytes = ? KB 5890/1024 = 6 KB

Answers �Convert 2 GB into KB 1 GB = 1024 MB 2 x 1024 = 2 GB = ? MB 2048 MB 1 MB = 1024 KB 2048 MB = ? KB 2048 x 1024 = 2097152 KB If I want to know how many bytes there are in 2 GB what would my next step be?

Some typical storage devices Device Storage Other Possibilities Floppy Disk 1. 44 MB CD 700 MB DVD 4. 7 GB 8. 7 GB, 9. 4 GB Pen Drive 8 GB 2 GB, 4 GB, 16 GB, 32 GB Blu Ray 25 GB 50 GB, 100 GB Hard Disk 500 GB 1 TB

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