Data Representation Flashcards
Define:
NOT Gate
Single Input
Single Output
If 1 is input, 0 is output
If 0 is input, 1 is output
Triangle with circle on tip - symbol
Define:
AND Gate
Two inputs
Single output
If both inputs are 1, output is 1
If both input are 0 or only one is 1, output is 0
D shaped - symbol
Define:
OR Gate
Two inputs
Single output
If one or both inputs are 1, output is 1
If both inputs are 0, output is 0
D shaped with curve inwards on straight edge - symbol
Represent:
NOT A
(Boolean Algebra)
Ā
Represent:
A AND B
(Boolean Algebra)
A.B
Represent:
A OR B
(Boolean Algebra)
A + B
Represent:
A XOR B
(Boolean Algebra)
A ⊕ B
Describe:
Bit
A single binary digit ( 1 or 0 )
Describe:
Nibble
4 bits
Describe:
Byte (B)
8 bits
Describe:
Kilobyte (kB)
1000 bytes
Describe:
Megabyte (MB)
1000 kilobytes
Describe:
Gigabyte (GB)
1000 megabytes
Describe:
Terrabyte (TB)
1000 gigabytes
Define:
Left Shift
Binary values are shifted one column to the left
The value is doubled
Define:
Right Shift
Binary values are shifted one column to the right
The value is halved
List:
Denary to Hex values
- 0
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- A
- B
- C
- D
- E
- F
Describe:
7-Bit ASCII
128 Characters
Represents characters in the English language
Describe:
Extended ASCII
8-Bit
256 Characters
Includes characters from some European alphabets
Describe:
Unicode
Covers all major languages and tries to cover every possible letter or symbol that might be written
Describe:
Bitmap Representation
Images made up of lots of small points called pixels
Each pixel is represented by a binary value
Equation:
Bitmap File Size
File Size = Height × Width × Colour Depth
Describe:
Sound Files
Recorded by a microphone as analogue signals
Analogue signals are converted into digital dat so computers can read them.
This is called sampling
Equation:
Sound File Size
File Size = Sample Rate × Sample Resolution × Length
