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)

Khan Academy: https://www.khanacademy.org/cs/new  – I tried this and very quickly made a pink oval on a blue background.
Hello Prcessing.org: http://hello.processing.org/  seriously hyper presenter! but very clear and easy to follow
CS Unplugged: http://csunplugged.org

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

reinforcing game here

 

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.