A scheme of simple band-pass RC- and LR- filters on operational amplifiers containing only one capacitor or inductor and 3 resistors is proposed. A comparison is made of the amplitude-frequency ...

Try looking up Fast Fourier Transforms. That will convert your signal to an array of frequency magnitudes, you can attenuate the lower frequencies, and then reverse-FFT back to the filter signal.

An aerial filter is used to prevent unwanted signals from reaching your equipment, whilst allowing the wanted ones to pass through unaffected. Some filters may need to be installed before any ...