Data – Representation
L1: Data Encoding and Different Representations
Data encoding – putting a sequence of information into digital format
Decoding – converting from digital format back to original text (or whatever format)
Information is already represented in many different ways – different spoken languages, use of visual signals (sign language, semaphore), textural information (Braille), sound signals (whistles).
Computers are electrical, therefore signals are based on switches – on or off, thus the binary system. This is too easy to make errors, so we use programming languages.
L2: Digital Data: Images, Sounds and Text
Digital Images
picture elements = pixels
high x wide pixels = total resolution
Pixel Face: http://www.nga.gov/content/ngaweb/education/kids/kids-pixelface.html (online version not available – download to MAc or PC, or iOS app)
Digital Sound
Digital Text
The ASCII Code: http://www.theasciicode.com.ar/
L3 Binary
Binary 1s and 0s – relates to the on and off positions of electrical switches in the transistors in computers.
Counting in Binary – Base 2
L4: Example QR codes
What is a QR code and how does it work?
All your questions answered!
I have used QR codes as part of treasure hunt activities in the Library, and have helped other staff use them to share links to work online.
L5: Example Activity: Representing Sound
Using cues to indicate a sound eg picture of a drum to show a drumbeat
Foley – “the process of creating incidental sounds” ie adding all those background noises that fillin or audio environment.
Students can identify ordinary sounds and attempt to record or recreate these sounds
Task – QR codes – I have used in library displays, sharing files at professional learning events, sharing student work, and as part of Treasure Hunt clues activities.