Monthly Archives: December 2012

A one-pole filter

Posted on December 15, 2012 by Nigel Redmon

Here’s a very simple workhorse of DSP applications—the one-pole filter. By comparison, biquads implement two zeros and two poles. You can see that our one-pole simply discards the zeros (the feed-forward delay paths) and the second pole (feedback path): We … Continue reading →

Posted in DC Blocker, Digital Audio, IIR Filters, Source Code | 40 Comments

A note about de-normalization

Posted on December 3, 2012 by Nigel Redmon

One ugly thing that we need to be aware of, especially for filters, is the de-normalization of numbers. Basically, computer processors try to keep floating point numbers normalized—they try to keep them in the binary form 1.xxxxxx (where each x … Continue reading →

Posted in Digital Audio | 1 Comment