20 terms

Personal Digital Devices - SHS


Terms in this set (...)

What is GSM?
Stands for Global System for Mobile Communications. It is the telephone system used by mobile phones to communicate. It uses radio frequencies. Mobile phones operate on different frequencies depending on where you are in the world.
What is:
Dual Band
Tri Band
Quad band
and where do they work?
Dual band mobile phones pick up two radio frequencies (used in Europe & Asia)
Tri band mobile phones pick up three frequencies (Europe, Asia and North America)
Quad band mobile phones pick up four frequencies (work anywhere in world where there is a GSM service).
allows data to be exchanged between devices over short distances
Wi-Fi (wireless fidelity)
allows data to be exchanged between devices but the signal can travel longer distances than bluetooth
Global positioning system. System that uses information from satellites that orbit the earth to calculate your exact position in the world. Your device must be able to receive signals from 3 satellites in order to pin point your position. Doesn't work in tunnels or buildings.
GPS Tagging
Sometimes know as Geotagging.
If your smartphone, video camera or digital camera has GPS it can add GPS information to the video,photo giving it's location (longitude /latitude co-ordinates.
Useful for making digital holiday photo albums as the user knows where the image was taken.
Health risks linked to using mobile phones
Over use can mean people develop:
-RSI related illnesses such as "Blackberry Thumb" - over dependence of using thumb on screen, "Ipad Hand", "Ipad Shoulder" - all caused by holder phones/tablets in poor ways and straining hand and neck through poor posture.
-Headaches and deteriorating eye sight through eye strain of constantly looking at small, bright screen of mobile phone.
List two features of a smartphone that make it more suitable to take on short journeys than a laptop. [2 marks]
- smaller and lighter therefore easier to carry arround
- offers a longer battery life than a laptop
- mulitfunctional device that can offer many of the features of a laptop (ie surfing the internet, sending and receiving emails).
List two peripheral devices that could be used with a smartphone. [2 marks]
-Hands-free kit
-Portable keyboard
(NOT charger or SD card or Camera)
What is a peripheral? [1 mark]
-a device that is used to put information into or get information out of the computer (eg keyboard, monitor, mouse, speakers).
How many different types of peripherals are there and give an example of each? [3 marks]
-Input devices - keyboard, mouse, microphone, scanner
-Output devices - monitor, printer, speakers
-Storage devices - hard drives, USB pen drives (flash drives)
What is an accelerometer? [1 mark]
A sensor used on smartphones and tablets that senses when the device has been rotated and rotates the image on the screen so that it is the correct orintation for the user.
Give two features of tablet computers that make them easier to use than desktop computers. [2 marks]
-Tablets run Apps which are easier to install than installing traditional software from CD/DVD.
-Don't need to plug in peripherals (monitor, mouse etc) to use as you do with a desktop computer
-Tablets have touch screens and their user interface is more intuitive and therefore easier to use.
Describe the difference between IMAP and POP email protocols. [2 marks]
IMAP keeps a copy of the email on both the mail server and your computer/smartphone whereas POP deletes mail from mail server after it has been downloaded to your computer/phone.
IMAP means you have access to your emails whereever you access your emails. With POP you can only see all your emails on the computer/phone you access your emails on.
Suggest two ways the energy usage of a desktop computer could be reduced. [2 marks]
-Turn off computer when not being
-Reduce the brightness settings on the monitor
-Set up the computer to hibernate if no activity is sensed after 20 minutes
-Buy a more efficient PC/screen /
State one peripheral device that you would need to make a VoIP call using a laptop. [1 mark]
External microphone
External webcam
VoIP phone
External speakers
Headset (but cannot be accepted aswell as microphone or headphones)
(external must be used as peripherals are devices that are not an integral part of the laptop)
Describe why wired connections to the internet may not suitable when using mobile devices. [2 marks]
-Mobile devices are designed to be portable whereas if it relies on a wired connection would limit it's portability.
-Some portable devices do not have the LAN (network) port to enable it to connect sing wires.
What is the "digital divide"? [2 marks]
This is the gap between people in society who cannot or do not have
effective access to digital technology and those who do. Because access to technology is so important these days, people who do not have access
to it can be disadvantaged in many ways.
Explain how the "digital divide" affects some people's ability to buy goods online. [4 marks]
-Some people will be less able/unable to buy goods online (1), because of restricted/no access (to the internet) (1)
-People who live in remote areas may not have access to the internet (1) as there is a lack of broadband provision available (1).
-People with low or a lack ICT skills (1) are less likely to have the confidence or knowledge to be able to buy goods on line (1).
State one wired connection method you could use to connect a portable hard drive to a computer. [1 mark]
Any one of the following:
- USB data transfer cable
- E-Sata cable
- Lightning Cable (as used with Iphones/Ipads)
- Thunderbolt Cable (data transfer is 2 x speed of USB 3.0)