ict living in a digital world notes

notes to help wth revision

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  • Created by: rose 1212
  • Created on: 22-03-14 20:49
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  • ICT CHAPTER 1
    • Designing a mobile phone
      • GPS
        • Navigational system, used in many devices- gives current location/ directions from current location
        • distance  current location 2 specified location using signals from satellites
      • Assisted GPS- technology that has been built into mobile phones. when signal between mobile + satellite= weak, signal  sent by mobile phone- diverted 2 mobile masts which identify phones exact location
      • User interface- the way a user interacts with a system like computer/ determines how commands are given to computer
        • Menus: user chooses the commands from lists displayed on the screen.
        • GUI (Graphical user interface) e.g. windows- user gives command by selecting icons displayed on screen
        • Command line- used by specialists involves codes
    • What can your phone do?
      • Features of a mobile phone
        • Camcorder
        • Loadspeaker
        • Touch screen
        • MP3 player
        • WiFi
        • Bluetooth
        • Video calling
        • Internal memory
        • Hands- free device
        • GPS
        • Games
        • Alarm
        • Personal organiser
        • Roaming
        • USB port
        • Internet
        • Network band
        • SMS
        • Memory card
        • Voice recorder
        • Predictive text
        • Email
        • Memo
        • Radio
        • 3G
        • Calculator
        • Untitled
        • MMS
      • Choosing a phone
        • Picture resolution
          • quality and detail of screen of mobile. higher the resolution, better the quality. measured in pixels
        • Camera  resolution
          • amount of detail camera picks up in 1 picture. higher resolution, more detail camera picks up, measured in mega pixels
        • A mobile phone
          • Memory card- secondary storage device/ allows users to store, back up, remove files measured in giga bytes
          • Music player- saved as MP3 and WAV
          • storage capacity- amount of space phone has in its internal memory
          • Video files- stored as MP4, 3GP, AVI,
          • Connectivity
            • WiFi
              • similiar to bluetooth, used to exchange data but signal can travel further distance
            • Bluetooth
              • allows exchange of data over short distances
            • to connect to the internet mobile needs 2 receive/ send signals/ needs to connect wirelessly
          • Network band
            • Dual band- picks up 2 frequences
            • tri band- picking up 3 frequences
            • quad band- picking up 4 frequences
      • It is Malfunctional
        • ability to do different things using same device
      • Mobile phones for everyone
        • cons of mobile phones
          • Texting too much can lead to repetitive strain injury (RSI)
          • young people can be victims of bullying/ crime if targeted for their phone
          • mobiles phones not been around for too long, so scientists unsure of risks associated with using them
            • As a  precautionary, government health advisers recommend that children under 16 should not use mobile phones regularly.
          • Overuse of 'text speak' can have impact to spell words properly
        • Etiquette (rules), mobile safety advice
          • mobile phones= expensive/ easy target for thieves- should activate lock feature that requires pin
          • Recycle old phones
          • Avoid using mobile phone in quiet area e.g. quiet coaches, trains + libraries
          • when driving a car- illegal to talk on phone without hands- free kit
          • Activate keypad lock to prevent accidental emergency calls being made
          • After taking photo/ video of someone on phone- ask their permission before uploading it to a public domain
          • On internet- avoid viewing content- unsuitable for your age
          • Don't send malicious messages/ make prank calls- lead to police charging you with harassment
    • points to consider when designing phone at elderly people
      • navigation or menu system
      • number of features available
      • Weight of phone
      • Volume of capacity of speakers
      • Size of screen and buttons
      • Panic button to reach relatives easily
      • interface
    • What kind of computer?
      • Laptop
        • portable computer/ carries out same functions as desktop computers but in compact version that is light to carry around.
      • Netbook
        • Similar to notebook/ designed  mainly for wireless communication via email/ messaging + access to internet. Usually cheaper/ lower specification compared to laptops/ notebooks+ have solid state memory
      • Personal digital assistant (PDA)
        • Portable device- small enough to carry in palm of hand. Contains- note-making features/ telephone, internet facilities/ allows data to be exchanged with computers
      • Notebook
        • Similar to laptop but more compact
      • Things to consider when buying computer, laptop, net book, notebook
        • Storage capacity- the more you have the more files you can store
        • Processor speed- the quicker it is , the faster  your device will work
        • Amount of RAM- the more RAM it has, the more applications it will be able to support
          • RAM- temporary memory/ used to run programs already opened- higher- the more programs can be opened + they will respond. If power fails, unsaved work will be lost/ graphics and videos require more RAM.
        • Battery life (portable device)- how long will the power last
        • Considering the following features when buying computer
          • WIRELESS ENABLED- allows device to pick up WiFi signals/ enable you to connect to network/ connect devices/ access internet without wires
            • Date exchanged wirelessly slower than travelling through cables
              • Data can be distorted as it travels through air by other signals+ interference's.
          • Sound card/Graphics card- devices to fix computers main circuit/ allowing computer to play/ record sound + display graphics
          • Hard drive size= primary storage area of computer/ where software, files + data kept and retrieved from/ measured in gigabytes- bigger the hard drive/ the more data can be stored
          • USB connection (universal serial bus)- common method of connecting devices to computer/ if computer has more then 1- many peripherals can use this connection
          • Processor (CPU)- brains of computer- does the calculating/ number of calculations (processes)measured in GHz/ higher the processing speed- faster computer- but the more power it uses
          • Optical Drive- uses laser to read data encoded on CD's and DVD's/ allows you to install software, listen to music + watch films/ some optical drives allow CD/DVD to be written (burned)-useful if transferring information from the device.
    • Peripheral devices
      • Output
        • Projector
        • Printer
        • Speakers
        • Head phones
      • Input
        • Scanner
        • Mouse
        • Keyboard
        • Webcam
      • Storage devices
        • External HD
        • USB
      • Future proofing
        • Untitled
          • when buying something making sure it is for long term high spec and will not go out of date quickly.

Comments

ranya88

this is really good thank you

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