Digital Sound & Music: Concepts, Applications, & Science, Chapter 2, last updated 6/25/2013
31
Figure 2.32 440 Hz sine wave
Then with
fplot('sin(262*2*pi*t)', [0, 0.05, -1.5, 1.5], 'red');
hold on
we get this figure:
Figure 2.33 Two sine waves plotted on same graph
The 262 Hz sine wave in the graph is red to differentiate it from the blue 440 Hz wave.
The last parameter in the fplot function causes the graph to be plotted in red. Changing the color
or line width also can be done by choosing Edit/Figure Properties on the figure, selecting the sine
wave, and changing its properties.
We also can add sine waves to create more complex waves, as we did using Adobe
Audition in Section 2.2.2. This is a simple matter of adding the functions and graphing the sum,
as shown below.
figure
fplot('sin(262*2*pi*t)+sin(440*2*pi*t)', [0, 0.05, -2.5, 2.5]);
First, we type figure to open a new empty figure (so that our new graph is not overlaid on the
currently open figure). We then graph the sum of the sine waves for the notes C and A. The
result is this:
0 0.005 0.01 0.015 0.02 0.025 0.03 0.035 0.04 0.045 0.05
-1.5
-1
-0.5
0
0.5
1
1.5
0 0.005 0.01 0.015 0.02 0.025 0.03 0.035 0.04 0.045 0.05
-1.5
-1
-0.5
0
0.5
1
1.5
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