This is Dr. Ferri, and this an extra
problem for demonstrating how to use the
frequency spectrum.
I'd like you to be able to recognize
frequency
content of signal as it's shown in the
frequency spectrum,
as well as the frequency content of the
signals
as you see it in the time domain, shown
here.
So this problem asks you to match the time
domain
voltage waveform to the appropriate
frequency spectrum on the left.
So let's start looking at this, let's look
at this one right here, this one has a DC
value, so this is for DC.
A DC component plus some higher frequency.
Now the ones on the right, there's only
one of them that has an offset.
You see this offset of one, is the same as
that value right here.
So this frequency, this sine wave is
offset by a
value of one, so this one has to be that
frequency
spectrum there.
And then of the other two, if we look at
them, this one has a low frequency that
kind of dominates.
And this one, the higher frequency
dominates.
So, off over on, on this synch, the low
frequency dominates here and here the high
frequency dominates so,
they look like this.
right there and then like that, so this is
how they match up.
So, just to summarize here, I looked first
at any that had DC components and
that corresponds to an offset and then
I really looked at what the frequencies
were.
Since these two had the same frequencies,
the only difference
was their amplitudes and in which case,
which one dominated.
This one, the high frequency would
dominate
and this one, the low frequency would
dominate.
Thank you.