There is a scenario: There is a certain box which emits acoustic signals at 30kHz and you are trying to detect these signals using some sort of detector.
I was wondering, would it be more efficient to make a band pass filter for this or some sort of high pass filter to recognise the existence of these signals?
In regards to a high pass filter, this is easily done for example you can use a second order high pass filter since it attenuates more sharply than first order e.g:
The magnitude response could look something like:
However, how exactly would you be able to make a band pass filter which incorporates both a high pass and low pass element such that only a certain range of frequencies could be used?
Many thanks for any help.