Variety In Mathematics Lessons
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Singing Graphs! (see page 16)
Many learners will be familiar with experiencing a graph as a static image or as a left-to-right developing line. (The impact of these alternatives can be quite different.) Often these pictures are linked to tables of numbers. A differentway of experiencing a graph might be as a , where the pitch relates to the ‘y-value’, while the ‘x-value’ operates as time.
The program SoundFunction (available for free download below) enables the user to enter a list of numbers (perhaps pasting in a column of values from a spreadsheet) and the software generates the appropriate soundtrack. (Zero is taken as middle C and an increase of 1 unit corresponds to a semitone musically.)
To download the free program, click here and then click 'Install'. (You will need to have DirectX installed on your computer; if you haven't, you can download this for free from http://www.microsoft.com/downloads/.)
Scroll down this page for some mp3 files produced by SoundFunction.
Tasks learners might work on with this program could include:
· Predict what particular graphs would sound like and then try them out.
· Identify graphs from their sounds as precisely as you can (see below for ready-made examples).
· Which graphs sound ‘boring’/'predictable'? Why?
· Which graphs sound 'surprising'? Why?
· Which graphs are ‘soprano’/’bass’ graphs? Why?
· Which graphs are in your singing range? Which would be hard to sing? Why?
· When do you need 'perfect pitch' to identify a graph; when is 'relative pitch' enough?
What are the aural effects of transformations
It is also possible to use SoundFunction to represent :
· What do the square numbers ‘sound like’?
· How could you tell the square numbers from the cube numbers?
· How does an arithmetic series sound different from a geometric series?
· What is the same and what is different about the sounds of different arithmetic series?
Listen to the sound files (mp3) below and try to identify which graphs (or kinds of graphs) they might represent:
© Colin Foster 2007