What is HPF (High Pass Filter)?

A high-pass filter (HPF) passes signals with a recurrence higher than a specific cutoff recurrence and attenuates signals with frequencies lower than the cutoff recurrence. A high-pass filter is generally displayed as a linear time-invariant system. The high-pass filter passes only longer frequencies. In optics a high pass filter is a translucent window of colored material that permits light longer than a specific frequency to go through and attenuates light of shorter frequencies.