10A1 - Introduction to sound representation - 12/09/17
(Mr Noake)
Learning Objectives: (Click on underlined words for a definition)
Must: Demonstrate
that you understand binary
and how it is used to store/generate sound.
Should: Define the
terms analogue,
amplitude,
wavelength,
frequency and sample
rate.
Could: Explain the
factors which can affect the size of a sound file and the quality
of its playback.
Video clip:
http://richannel.org/christmas-lectures-2008-chris-bishop--the-ghost-in-the-machine
(From 13:40 -15:20 approx. 2
mins)
TASK 2 - IN PAIRS - 2
MINS
Discuss Vinyl, CD or MP3 – which is best
quality?
Explain sampling analogue sound and analogue to digital conversion. Evaluate sample rates 42KHz and 8KHz.
Task 3: Explore the difference between frequency & amplitude:
http://www.classzone.com/books/ml_science_share/vis_sim/wslm05_pg18_graph/wslm05_pg18_graph.html
TASK 4: Study this link
http://www.bbc.co.uk/education/guides/z7vc7ty/revision
TASK 5: Using what you have
learned from tasks 1-4 (above), plus information from the following
link, produce a one-page Word document or single PowerPoint slide
to explain exactly how MP3 players work. Ensure you include a
definition for the terms analogue, amplitude, wavelength, frequency
and sample rate. http://www.explainthatstuff.com/how-mp3players-work.html
EXTENSION: Add a second page
(or slide) to explain the factors which can affect the size of a
sound file and the quality of its playback.
TASK 6: Complete the following
quiz to extend and check your knowledge: -
http://www.bbc.co.uk/education/guides/z7vc7ty/test
Quick summary YouTube video: Sound in computer systems: https://youtu.be/3VgZVxgaA8c