I have a 192kHz IQ signal from an RF receiver, and i'm trying to remove signals in the negative (or positive) frequency spectrum.
I see that the negative frequency signals are -90 degrees phase shifted from I, where positive frequencies have the usual +90 degrees shift I vs Q.
Here's the problem:
If i set the center frequency to f, and i have two signals, one at f+1000, one at f-1000, they would both be audible on the same frequency, if i mix the whole thing into audio, either interfering with each other, or cancelling each other out.
I'm missing the step where i can decide whether i want to hear anything below or above center.
How is this usually being filtered?