Author Archives: Nigel Redmon

Amplitude Modulation Principles and Interactive Widget video

This video demonstrates important uses of AM—and serves as a demonstration of using the AM widget.

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Amplitude Modulation Deep and Fast video

Here’s Amplitude Modulation Deep and Fast, a not too lengthy video that gets to the roots of what amplitude modulation does mathematically. I’ve referred to AM’s role in sampling theory in past articles, and its relatively simple math makes understanding … Continue reading

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AM widget

Posted in Amplitude Modulation, Widgets | Leave a comment

Further thoughts on wave table oscillators

I see regular questions about wave table oscillators in various forums. While the process is straight forward, I sympathize that it’s not so simple to figure out what’s important if you really want to understand how it works. For instance, … Continue reading

Posted in Digital Audio, Oscillators, Uncategorized, Wavetable Oscillators | 7 Comments

WaveUtils updated

WaveUtils needed only a minor change for compatibility with the WaveTableOsc update—addWaveTable changes to AddWaveTable. But I added something new while I was at it. The original wave table articles advocated minimizing the number of tables necessary—one per octave—by allowing … Continue reading

Posted in Source Code, Wavetable Oscillators | 10 Comments

WaveTableOsc optimized

The wave table oscillator developed here in 2012 is pretty lightweight, but I never took a close look at optimization at the time. An efficient design is the number one optimization, and it already had that. I was curious how … Continue reading

Posted in Source Code, Wavetable Oscillators | 3 Comments

How I write code

Next article I’ll post an update of our wave table oscillator, but first I’ll take the opportunity to discuss how I write code these days. Maybe it will help make sense of some of the choices in the code I … Continue reading

Posted in Source Code | 18 Comments

Floating point denormals

There’s another issue with floating point hardware that can easily cause serious performance problems in DSP code. Fortunately, it’s also easy to guard against if you understand the issue. I covered this topic a few years ago in A note … Continue reading

Posted in Math | 6 Comments

Floating point caveats

The equivalent of “When I was your age, we use to walk to school in the snow. Barefoot”, in DSP, is to say we used to do DSP in fixed point math. The fixed-point system could be made of integer … Continue reading

Posted in Math | 9 Comments

Wavetable signal to noise ratio

In our wavetable series, we discussed what size our wavetables needed to be in order to give us an appropriate number of harmonics. But since we interpolated between adjacent table entries, the table size also dictates the signal to noise … Continue reading

Posted in Digital Audio, Oscillators, Wavetable Oscillators | Leave a comment