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To understand the complexities of
networking signals and cable testing, examine how analog signals vary
with time and with frequency. First, consider a single-frequency
electrical sine wave, whose frequency can be detected by the human
ear. If this signal is transmitted to a speaker, a tone can be heard.
How would a spectrum analyzer display this pure tone?
Next, imagine the combination of
several sine waves. The resulting wave is more complex than a pure
sine wave. Several tones would be heard. How would a spectrum analyzer
display this? The graph of several tones shows several individual
lines corresponding to the frequency of each tone. Finally, imagine a
complex signal, like a voice or a musical instrument. What would its
spectrum analyzer graph look like? If many different tones are
present, a continuous spectrum of individual tones would be
represented.
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Interactive Media Activity
Interactivity: Fourier Synthesis
In this activity, the user will draw sine waves by selecting the
amplitude, frequency, and phase of each.
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