Fourier Series For A Square Wave - HP F2226A - 48GII Graphic Calculator User Manual

Graphing calculator
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The resulting graph is shown below for k = 5 (the number of elements in the
series is 2k+1, i.e., 11, in this case):
From the plot it is very difficult to distinguish the original function from the
Fourier series approximation. Using k = 2, or 5 terms in the series, shows not
so good a fitting:
The Fourier series can be used to generate a periodic triangular wave (or saw
tooth wave) by changing the horizontal axis range, for example, from –2 to 4.
The graph shown below uses k = 5:

Fourier series for a square wave

A square wave can be generated by using the function
, 0
if
0
<
x
<
g
(
x
)
=
, 1
if
1
<
x
<
, 0
if
3
<
x
<
1
3
4
Page 16-39

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