Topic 1d
Storage of things beyond numbers

Learning Outcomes

By the end of this topic students should be able to:

• Explain how a photo is encoded in [24 | 32] bit format.
• Calculate the size in memory of an uncompressed photo in [24|32]-bit format.
• Explain how a sound file is encoded.
• Calculate the size in memory of an uncompressed sound file.
• Explain how a text file is encoded in [ASCII | UNICODE] format.
• Calculate the size in memory of an uncompressed text file in [ASCII | UNICODE] format.

Learning Materials

• Readings
  • Section 1.4 - pp 43-50
• Videos
  • Crash Course Computing #4 - Representing Numbers and Letters with Binary
    • Finish out the video from the 6:45 part on
  • https://www.youtube.com/watch?v=Xpk67YzOn5w
    • You watched the bulk of this video earlier. Today we start to understand the part in the gap between 3:45 and 5:00
  • https://www.youtube.com/watch?v=15aqFQQVBWU - A Code.org video about picture encodings.
• Activity
  • In order to explore the different encodings/values of one byte you can use the following scratch program.
    • https://scratch.mit.edu/projects/315577427/fullscreen/

 

Checking for Understanding

Answer the following questions from your textbook. The answers to all Q&E questions are in the back of your book in Appendix F.

• p49, #1
• p50, #2
• p50, #3
• p50, #9
• p50, #10

Additional Guidance

• If you are still struggling with the material in this topic, the following videos may help.
  • A little bit more about ASCII
  • CFU, p49, #1
  • CFU, p50, #2
  • CFU, p50, #9
  • CFU, p50, #10

Further Information

• NA