Data Representation

2^1 bits, 2^2 nibbles, 2^3 bytes, 2^10 KB, 2^20 MB, 2^30 GB, 2^40 TB, 2^50PB

1 byte

2 bytes

Base 16, 0-9 then A-F, MAC Addresses/Html colour coding and computer error messages, IPV6 messages

In binary using 1s and 0s, on or off

Bitmap (raster) images are comprised of small picture elements called pixels. Bitmaps blur when enlarged

Vector images use mathematical expressions to describe how the image is created and do not blur when enlarged

JPG or JPEG is a type of bitmap image that has been compressed using lossy compression. When the image is enlarged it appears blurry.

pixels down x pixels across x bit depth divide answer by 8 to give in bytes divide by 1024 if more than to give in KB and so on till PB

Humans hear sound as analogue data that varies over time though computers work with digital data. Computers sample the sound at difference time intervals to best recreate it.

The more samples per time interval the better the quality of sound

frequency (sample rate/hertz) x bit depth x length x channels channels: stereo is 2 5.1 is 6 7.1 is 8

In an MP3 file lossy compression works by removing frequencies humans can’t hear well and/or at all

MIDI files don’t contain music or sounds, they contain a list of commands that instruct a device on what sound to produce, how loud, what frequency and for how long.

MP4 files allow for multimedia, sound and picture

audio, video, images

text