14168359
Description
Mind Map by Daniel Taylor, updated more than 1 year ago
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Created by Daniel Taylor
over 6 years ago
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data representation
- binary
- a series of 1s and 0s which
each represent a number
- 1 is on and 0 is off
- 1 is on and 0 is off
- computers read everything in
binary
- binary addition
- 0+0=0
- 1+1=0 but carry a 1
to the next column
- 1+0 or 0+1=1
with no carried
numbers
- 0+0=0
- Binary to denary conversion
- every denary number
has a binary equivalent
- every denary number
has a binary equivalent
- a series of 1s and 0s which
each represent a number
- denary
- everyday
numbers
from 1 - 9
- everyday
numbers
from 1 - 9
- hexadecimal
- normal numbers up to 9 then 10 to
15 are A, B, C, D, E, and F represent
the numbers
- e.g. FF = 255, 11 = 17,
5B = 91 and E8 = 232
- e.g. FF = 255, 11 = 17,
5B = 91 and E8 = 232
- easy to convert
to and from binary
- a 16 base system
- normal numbers up to 9 then 10 to
15 are A, B, C, D, E, and F represent
the numbers
- images
- pixel: smallest addressable area
- every pixel has the same amount of
memory attached to it, if it is 2 bits it
can store 4 colours
- 8 bits = 256 colours
- 8 bits = 256 colours
- every pixel has the same amount of
memory attached to it, if it is 2 bits it
can store 4 colours
- resolution =
number of pixels
across by number
of pixels down
- pixel: smallest addressable area
- sound
- sampling rate:
how frequently
the sounds are
sampled
- original sound is
analogue but
computers use digital
- bitrate: number of bits that
can be put through the
system in a second,
measured in kilobytes per
second
- bits per sample x
samples per second
x number of
channels
- bits per sample x
samples per second
x number of
channels
- midi
- sampling rate:
how frequently
the sounds are
sampled
- compression
- lossless compression
- lossless compression leaves out repeated data
and instead makes a note of how many times it
is repeated
- lossless compression leaves out repeated data
and instead makes a note of how many times it
is repeated
- lossy compression
- lossy removes data to make it
smaller but this cant be
restored and the image may
not have the same quality as
before
- lossy removes data to make it
smaller but this cant be
restored and the image may
not have the same quality as
before
- lossless compression
Media attachments
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