Author Archives: Nigel Redmon

Filters for synths–starting out

Posted on February 21, 2016 by Nigel Redmon

We haven’t developed a synth filter here yet… Filters we’ve presented Biquads. While they are useful for many simple cases of filtering, they are not a good choice for analog synthesizer emulation. Most notably, they are poorly suited to time-varying … Continue reading →

Posted in Digital Audio, Filters, IIR Filters, Synthesizers | Leave a comment

Audio Signal Processing for Music Applications

Posted on September 16, 2015 by Nigel Redmon

I’d like to recommend this excellent—and free—online course: Audio Signal Processing for Music Applications by Prof Xavier Serra, Prof Julius O Smith, III The brief: In this course you will learn about audio signal processing methodologies that are specific for music … Continue reading →

Posted in Digital Audio | 1 Comment

Dither—The Naked Truth video

Posted on January 22, 2015 by Nigel Redmon

This video presents the “naked truth” on dither and truncation error, by stripping away the original signal of a musical clip and listening at different bit levels. I boost the error to a normalized audio volume for easy comparison of … Continue reading →

Posted in Digital Audio, Dither, Video | 2 Comments

Dither widget

Posted on March 15, 2014 by Nigel Redmon
Posted in Digital Audio, Dither, Widgets | Leave a comment

Audio Dither Explained video

Posted on March 13, 2014 by Nigel Redmon

This video discusses the how and why of dither.

Posted in Digital Audio, Dither, Video | 1 Comment

More about source code

Posted on January 9, 2014 by Nigel Redmon

I was admonished (in not a nice way—not terribly rude, but quite to the point that I don’t know what I’m doing) by an anonymous visitor, who concluded that I don’t know much about C++ and maybe should have written … Continue reading →

Posted in Source Code | 7 Comments

Pole-Zero placement v2

Posted on October 28, 2013 by Nigel Redmon

Pair Pole mag Pole angle Pair Zero mag Zero angle Sample rate (Hz) linearlog Plot A new pole-zero calculator An JavaScript remake of the old Java-based pole-zero placement applet—visit that page for tips on pole-zero locations for standard biquads. The … Continue reading →

Posted in Biquads, Digital Audio, Filters, IIR Filters, Widgets | 15 Comments

Biquad calculator v2

Posted on October 13, 2013 by Nigel Redmon

Type:lowpasshighpassbandpassnotchpeaklow shelfhigh shelfone-pole lpone-pole hp Plot:linearlog Sample rate (Hz) Fc (Hz) Q Gain (dB) Here’s an update of the biquad calculator. It adds one-pole highpass and lowpass filters, and frequency, Q, and gain sliders. The sliders cover the range of … Continue reading →

Posted in Biquads, Digital Audio, Filters, IIR Filters, Widgets | 98 Comments

Envelope generators—ADSR widget

Posted on June 23, 2013 by Nigel Redmon

Attack Decay Sustain Release Attack Curve Decay/Release Curve Plot:linearlog This is the widget I used in making the ADSR video. It’s a JavaScript recreation of my C++ source code.

Posted in Envelope Generators, Synthesizers, Widgets | Tagged | 23 Comments

Envelope generators—ADSR video

Posted on June 22, 2013 by Nigel Redmon

Let me know how you like this one!

Posted in Envelope Generators, Synthesizers, Video | Tagged | 7 Comments