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Unit Overview: Data Representation

Lessons:

9 lessons

Number bases

In this lesson, we will use decimal representation to explore the concept of place values in number bases and the values of digits. Then, we will explore the representation of binary values, and converting these back to decimal.

  • 2 Quizzes
  • 15m Video
  • Presentation(PPT)
  • Transcript

Representing text

In this lesson, we will look at character coding systems. First, we will consider character coding systems that you might have come across before, such as semaphore and Morse code, then we will be introduced to ASCII, a standard coding system for representing text. Next, we will learn about the need for Unicode to extend ASCII. Finally, we will learn how to work out the size of a plain text file.

  • 1 Quiz
  • 14m Video
  • Presentation(PPT)
  • Worksheet
  • Transcript

Representing sound

In this lesson, we will look at sound and think about how it could be represented for storage or transmission. We will investigate the effect of sound waves in the air and how this relates to speakers and microphones. We will sample a short sound wave in order to understand this representation and how it can be improved on. We will also calculate representation size from sample rate, size, and duration.

  • 1 Quiz
  • 11m Video
  • Presentation(PPT)
  • Worksheet
  • Transcript