Topic 1 - Personal Digital devices

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  • Topic 1 - Personal Digital devices
    • 1.1) Mobile phones
      • Mobile phones were originally developed to allow users to make voice calls on the move
        • Later, people were able to send short text messages via. SMS
        • Todays smart phones are known as 'multifunctional'
      • Common features of the modern phone include...
        • SMS - to send text messages
        • Camera - still images and video
        • bluetooth - allows data to be exchanged over short distances
        • Wifi - to exchange data, signal can travel long distances
        • Mp3 player- to listen to music files
        • GPS- can pinpoint your location using satellite
        • Games or apps- software for entertainment or practical uses
      • Responsible use of mobile phones
        • Recycle old phones- help the environment
        • Don't take someones photo without permission
        • Don't use a mobile phone while driving
        • Don't send abusive text messages
        • Don't overuse
      • Security of mobile phones
        • Lock the Sim card
        • Set up a PIN, Password or bio metric lock
        • Record the unique IMEI number
        • Restrict Bluetooth useage
      • GPS
        • GPS receivers use the data to calculate the users exact geographic location
        • Smart phones now have the ability to 'tag' a photo or video by adding GPS data to it.
        • Geo tagging involves applying longitude and latitude coordinates to a video or photo
        • Mobile phones in different areas of the world operate on different frequencies
          • If users want to use a mobile phone abroad, they need to use a Dual band, tri band or Quad band
    • 1.2) Personal Computers
      • Types of computer - select a computer that meets the needs based on functionality, weight and cost
        • Desktop computers
          • Heavy. designed to stay in one place
          • Useful in an office environment
          • Need input and output peripherals
          • Powerful processors
          • Easy to upgrade and add extra functions to enhance
        • Laptop computers
          • monitor, pointing device and webcam built in
          • Portable- light enough to be carried around
          • Battery powered or can use an electricity supply
          • Useful for students
          • Built in Wi-Fi and bluetooth
          • Less easy to dismantle and upgrade
        • Netbook computers
          • Strong and robust
          • Small and lightweight
          • Designed for using the internet
          • Boot up quickly because they have solid state SD cards as storage devices
        • Tablet computers
          • very light and portable
          • Touch screen interface
          • Virtual on screen keyboard
          • Designed for playing media, internet use and reading ebooks
      • Parts of a computer
        • CPU - This part processes calculations. speed is measured in GHZ
        • Hard drive- Software and data are stored in the computers hard drive. Measured in Gigabytes
        • Memory - The computer uses memory to run applications. RAM is temporary and data can be lost
        • Graphics card- A good one allows the system to to display high quality images, video and games.
      • What to consider when buying a new computer?
        • Battery life RAM Storage Processor speed
      • Peripherals
        • Input devices- Allow the user to input data into computer
        • Output devices- Allow the user to hear, view or print processed data
        • Storage devices - Allow user to store data so it can be used again
    • 1.3) Cameras and Camcorders
      • Features of a Camcorder
        • GPS tagging
        • LCD screen- viewfinder for playback
        • Lightweight and portable
        • Internal hard drive or memory card
        • Shockproof
        • WI- Fi for uploading
      • Features of a Digital Camera
        • Takes still images
        • some have GPS built in
        • most have a Zoom feature
        • stores image on a memory card
        • DSLR cameras- bigger but have more features
        • Download straight to PC
      • Resolution and Zoom
        • Digitial Zoom- Just crops and enlarges part of the image
        • Optical Zoom- Moves the lens away from the sensor closer to the subject, bringing light from  subject closer
        • Images are made up of pixels- a tiny point of an image
        • More pixels, more detailed the image
    • 1.4) Media players
      • Key features of media players
        • Small, light and easy to carry
        • Long battery life
        • can set playlists
        • can lock to prevent accidental activation
        • Uses solid state memory so songs don't skip when jolted
      • Security features
        • Uses anti-virus software
        • Hard reset feature to allow users to delete data
        • Encrypts data to prevent others accessing it
        • Remote management (deactivation) allows you to remotely deactivate if stolen
      • Downloading and streaming
        • Most users download audio or video to store and play on their media players
        • If the device has Wi-fi the user can stream media- the file is sent in compressed form over the internet and displayed by viewer in real time. Eg. YoutTube
        • Adv- Uses less storage space.
        • Disadv-Cannot keep a local copy for viewing online
        • Disadv- user experience is dependent upon connection

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