Electronic Music Interactive v2

22. High-pass Filters

Another type of filter found in some synthesis systems is the high-pass filter. The high-pass filter functions inversely to the low-pass filter. That is, this filter only passes frequencies above the cutoff frequency while attenuating those below.

Background and labels of frequencies and steps of the process of filters.
Soundwave representation.
Blue soundwave representation.
Filtered soundwave.
Filtered blue soundwave.
Starting state of animation.

Example 22-1: A high-pass filter attenuates frequencies below the cutoff frequency.

It is important to remember that the frequencies input to the high-pass filter that fall below the cutoff frequency are, similar to the low-pass filter, not completely removed, but instead are gradually attenuated.