Monthly Archives: February 2003

Biquads

Posted on February 28, 2003 by Nigel Redmon

One of the most-used filter forms is the biquad. A biquad is a second order (two poles and two zeros) IIR filter. It is high enough order to be useful on its own, and—because of coefficient sensitivities in higher order … Continue reading →

Posted in Biquads, Digital Audio, Filters, IIR Filters | 30 Comments

Pole-Zero placement

Posted on February 27, 2003 by Nigel Redmon

Use the new, improved pole-zero calculator—but be sure to read the “Experiments with standard biquads” section below for tips on placing poles and zeros for standard filters. Here’s a Java applet that illustrates pole-zero placement. It lets you design a … Continue reading →

Posted in Biquads, Digital Audio, Filters, IIR Filters, Widgets | 8 Comments