Data representation
- Created by: AnnaBrady2
- Created on: 12-11-16 15:37
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- Data representation
- Binary
- Computers use the binary alpha to represent all data and instructions
- Consists of two numbers, 1 and 0. Symbolise voltage, 0 being off and 1 being on
- Could represent different types of data such as text, image, sound, integer, date and real number
- The stages of converting sound to digital form
- 1. computer cannot work with analogue data, so converted to digital data
- 2. Microphone picks up sound waves
- 3. Converted to an electrical analogue signal
- 4. Value read at specific point and rounded to a level
- 5. The points which sound is read and stored defines the sample rate. the higher the sample rate the better quality but the larger the sound file.
- 6. Binary representation is stored
- Stage of using binary to represent bitmap images
- 1. Image represented as grid or sequence of pixels
- 2. Each pixel is represented by one bit, white is represent by 0 and black is represent a 1
- 3. White and black are represented by using different patterns
- 4. Same bit pattern used for black and white
- 5. Metadata about the image is also stored
- ASCII- American Standard Code for Information Interchange
- Characters are represented in binary using ASCII or other character conversion system
- Has limitations, total number of characters that can be encded is 128 characters
- Possible limitations for global communicatio-n
- ASCII is 7 bit character set so can include 128 different characters
- Characters of other languages or alphabets cannot be represented
- These 128 characters represent mainly just the latin alphabet
- ASCII is 7 bit character set so can include 128 different characters
- These 128 characters represent mainly just the latin alphabet
- Advantages of hexidecimal over binary
- easier to read than binary
- easier to convert to binary than denery
- Numbers displayed in more compact way in hex
- Quicker to type in hex numbers than binary numbers
- Less memory is used to store hex than binary
- Easier to remember as shorter
- Binary
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