Bandstop filters can be regarded as a combination of a lowpass and a highpass filter.
2.
In addition, a three-position non-resonant highpass filter is provided to thin out lower frequencies.
3.
Likewise, stacks of inductive grids make a highpass filter with a sharp frequency cutoff below which transmission is almost zero.
4.
Where " ? c " is the point on the highpass filter corresponding to " ? c "'on the prototype.
5.
Lowpass and highpass filters can be viewed as special cases of the resonator expression with one or the other of the terms becoming zero as appropriate.
6.
Alternatively, if the distortion products are at higher frequencies, a highpass filter can be used if its cutoff rate is sufficiently steep to not affect the expected distortion products.
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