Hi all,


second question of the day is about the complex filter. From my understanding, all real signals (sine, cosine...) can be split into positive and negative frequencies. A complex filter uses the combination of I and Q signals to reject the positive or negative half of the spectrum.

So my question is, what comes out at the other end? If the output has no negative half, then it must be a complex signal. So what would we see on the oscilloscope?

As a sub-question, is it possible to realize a signal with only a positive or only a negative frequency?


thanks,
Aaron