elvis0206
Junior Member level 1

In DSP, I have encountered various types of filters.
Among them, I'm most interested in the bandpass filter. I wonder why it is designed in symmetrical about the y-axis?
That's the central frequency of the passbands of a bandpass filter is at frequency(doesn't matter it is normalized or not) v1 and -v1 on the positive and the negative x-axis respectively, but no other frequency, let say v1 on positive and -v2 on negative x-axis?
what is the objective for such design?
what effect it gives to the final result of the output?
I have found some books but found no answers about these....hope you guys can help
Among them, I'm most interested in the bandpass filter. I wonder why it is designed in symmetrical about the y-axis?
That's the central frequency of the passbands of a bandpass filter is at frequency(doesn't matter it is normalized or not) v1 and -v1 on the positive and the negative x-axis respectively, but no other frequency, let say v1 on positive and -v2 on negative x-axis?
what is the objective for such design?
what effect it gives to the final result of the output?
I have found some books but found no answers about these....hope you guys can help