Data representation Flashcards
1
Q
ASCII
A
128 different characters all with a 7-bit binary code (an extra 0 is added to the front so characters can fit in a byte)
2
Q
Hexadecimal
A
16 digits (0-9, A-F)
3
Q
Binary shifts
A
Multiply or divide by 2 by moving left or right
4
Q
Bit image (formula)
A
2(x) = y colours
5
Q
Image file size (formula) =
A
Image resolution x colour depth = width x height x colour depth
6
Q
Sound file size (formula) =
A
Sample rate (Hz) x bit depth x duration (s)
7
Q
Lossy compression
A
Loses data irreversibly but is very small and can be transported easier
8
Q
Lossless compression
A
Only slight reduction in file size but maintains quality
