Error Detection

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Card Flip Magic

The world is noisy place, and errors can occur whenever information is stored or transmitted. Error detection techniques add extra parity bits to data to determine when errors have occurred.

This activity is a magic trick which most audiences find intriguing. In the trick the demonstrator is "magically" able to figure which one out of dozens of cards has been turned over, using the same methods that computers use to figure out if an error has occurred in data storage.

  • Cartoon
Videos 
Photos 
  • Matt and a volunteer from the audience prepare for the "Parity Trick" (activity

    Matt and a volunteer from the audience prepare for the "Parity Trick" (activity 4 in the book), using magnetic cards.

  • The parity tiles on a magnetic blackboard, from a demonstration in Japan.

    The parity tiles on a magnetic blackboard, from a demonstration in Japan.

  • Unplugged in a High School Classroom, Japan

    Unplugged in a High School Classroom, Japan

  • Students trying out Unplugged in a High School Classroom, Japan

    Students trying out Unplugged in a High School Classroom, Japan

  • Tim explains Parity Magic Trick, UOC, Christchurch, 17-18.04.2008

    Tim explains Parity Magic Trick, UOC, Christchurch, 17-18.04.2008

  • Tim guides students in Parity Magic Trick, UOC, Christchurch, 17-18.04.2008

    Tim guides students in Parity Magic Trick, UOC, Christchurch, 17-18.04.2008

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