/ Examples / Filters / TwoPoles

TwoPole

A two-pole digital filter can act as a bandpass filter that emphasizes frequencies near its pole. For more details, see Smith/CCRMA and Two Pole Plot

ResFreq is the resonant frequency meaasured in Hz.

Radius is a measure of the filter quality and should be below 1. As values get larger than .99 it's possible to enter the overflow regime. Alway monitor your gains accordingly.

Normalize triggers an extra calculation of a filter gain to reduce the chance of overflow.

Gain multiplies the incoming signal prior to filtering.

op allows you to bypass the filter by selecting passthrough.

The Example

Here we control NoiseCtrl with AbcSequencer to produce controlled bursts of white noise. That signal is routed into TwoPole whose ResFreq is automated by a phasor sweep from 50 to 2000 Hz. Inside Channel you'll also find an NRev reverberator.