4171767
Description
Mind Map by Karl Taylor, updated more than 1 year ago
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Created by Karl Taylor
about 9 years ago
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Input Devices
(Made by Karl
Taylor)
- How images are transmitted
- Bars on bar codes are taken in
pairs and can stand for numbers
which when put together can make
a code which stands for something
- When you shine a laser at the bar the
difference in light reflection between the light
and dark is information that the computer
uses
- Images are stored in a grid of
small squares which are given
the value 1 or 0
- The image can become clearer by
increasing the number of squares
(pixels)
- Increasing the max
value of the squares
from 1 to 2 allows
for more shades
- 00 = white
- 01 = light grey
- 10 = dark grey
- 11 = black
- 00 = white
- Colour requires each pixel
to have a combination of 3
colours: red, green and blue
- The image can become clearer by
increasing the number of squares
(pixels)
- Bars on bar codes are taken in
pairs and can stand for numbers
which when put together can make
a code which stands for something
- Keyboard
- Contains a number of characters with
each key responding to a number of 1s
and 0s that identify the key that has been
pressed
- Contains a number of characters with
each key responding to a number of 1s
and 0s that identify the key that has been
pressed
- Mouse
- Can be wired or
wireless
- Privacy issues with wireless
- Difficult to make the information
go to only one user
- Difficult to make the information
go to only one user
- Privacy issues with wireless
- Devices that are connected to the
computer by a cable are hard
wired
- Types of wiring
- Simple copper cable
- Optic fibre cable
(uses light rather
than electricity)
- Simple copper cable
- Types of wiring
- Can be wired or
wireless
- Touch Screen
- Output Devices
- Easy to use because
user just needs to point
at the screen
- Largely vandal proof because it
can be exposed to the elements in
places such as train stations
- Easy source of
information specific to
the area
- Easy source of
information specific to
the area
- Is an output and input device
- User inputs then
receives the output on
the screen
- User inputs then
receives the output on
the screen
- Output Devices
- Microphone
- Collects sound and
inputs it into a
system
- Can collect
noises as well as
voices
- Can collect
noises as well as
voices
- Used by car alarms
- Sets of the alarm when
it hears the sound of
glass breaking
- Sets of the alarm when
it hears the sound of
glass breaking
- Collects sound and
inputs it into a
system
Media attachments
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