Electronic Music Interactive v2

23. Band-pass Filters

The band-pass filter is yet another filter used in some synthesizers. The band-pass filter, as the name indicates, allows a specified band of frequencies to pass while it attenuates those above and below that band. In this type of filter a bandwidth must be specified. The bandwidth is simply the arithmetic difference between the highest and lowest frequencies that are permitted to pass unattenuated. The user might determine that frequencies between 600 and 1000 Hz shall be allowed to pass, while any other frequencies will be attenuated.

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

Example 23-1: A band-pass filter attenuates frequencies outside the specified band of frequencies.