Category Archives: Widgets

Building a windowed sinc filter

Posted on December 5, 2010 by Nigel Redmon

As promised, here’s our windowed sinc calculator for building a 2x oversampling filter:  Factor  Length  Rejection  Gain Notes: Use the Tab or Enter keys to effect changes (most browsers), or press Calculate. The frequency axis is in multiples of the … Continue reading →

Posted in Digital Audio, Filters, FIR Filters, Impulse Response, Sample Rate Conversion, Widgets | 14 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

The Fourier series

Posted on November 14, 1996 by Nigel Redmon

(Java is no longer supported by many popular browsers, and can be difficult to enable others…) Experiment with harmonic (Fourier) synthesis with this Java applet! The sliders represent the levels of the first eight harmonics in the harmonic series. The second harmonic … Continue reading →

Posted in Digital Audio, FFT, Fourier, Widgets | 3 Comments

A Java MIDI reference

Posted on July 6, 1996 by Nigel Redmon

If you had a Java-equiped browser, you’d see as applet here that looks like this. Choose the MIDI message type from the message pop-up menu to display the corresponding MIDI message bytes. For channel messages, you can choose the MIDI … Continue reading →

Posted in MIDI, Widgets | Leave a comment