/ Examples / Filters / BandReject
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Plot .. Utility .. Pure ChucK
Wherein we present Band Reject filter..
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BandReject
BandReject is a basic and simple band reject, or [Notch] filter built atop ChucK's built-in BPF UGen. It is a 2nd order Butterworth Filter that shares the same controls and behavior with its siblings LowPass, HighPass and BandPass.
Remember that a filter's job is to reduce the amplitude of frequencies outside its sweet spot. When auditioning a filter configuration its wise to test it against a variety of input signals. The Noise UGen is handy for filter evaluation since it produces an all-frequency signal.
These filters are designed to pass (or reject) frequencies in a range defined by
their Cutoff and Quality (or Q) factor. The higher the Q the more strenuous
the filter will be in respecting your cutoff guidance. However, as you
increase Q you can cause underdamping of the signal which can lead to
the dreaded overflow condition. For this reason it's common to constrain Q
to the range 1-10 and carefully monitor/control the Gain.
In this graph, we see a CCGenerator that
is automating the Cutoff parameter to produce an interesting effect.
