Unit one Flashcards
Base of Binary system
Base of denary
Base of Hex
2
10
16
Uses of Hexadecimal
Error codes- Makes them shorter
IP Addresses- easier to memorize and read by humans
HTML codes- represents all colors on the screen
Binary shift to the right?
divide by 2
binary shift to the left
multiply by 2
Negative binary numbers and how to get them?
Two’s complement
- go from the right
-first 1 you see leave it
-after that switch 0s to 1s and 1s to 0s
What are ASCII characters?
Set of characters (0 to 127 in denary) that represent characters on the keyboard.
- 7 bit codes
A in ASCII
65
a in ASCII
97
0 in ASCII
48
Sampling Resolution definition
Number of bits used to represent sound amplitude (bit depth)
Sampling rate definition
Amount of samples collected in one second
File size of an audio=
Sample resol. x sample rate x length of audio
Bitmap images definition
an image made up of pixels
pixels definition
a dot or square on the screen that make up images
Color depth
how many bits is assigned to each pixel, it determines how many colors can be displayed in the picture.
2 to the power of n
Image resolution/ screen resolution/ dimension
horizontal pixels x vertical pixels
bit
basic unit of computing memory
Bit to Byte
÷8
order of the memory sizes
KiB (kibibytes)
MiB (Mebibytes)
GiB (Gibibytes)
TiB (Tebibytes)
To go from a smaller memory size to a bigger memory size
÷2¹⁰
To go from a bigger memory size to a smaller memory size
x2¹⁰
Why compress?
- Save storage
- Reduce time takes to stream (music/ video files)
- reduce time taken to upload
Lossless compression definition
You dont lose anything in the process of compression
Lossy compression definition
You lose some data in the process of compression
