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Category Archives: Wavetable Oscillators
A wavetable oscillator—Introduction
Years ago, Cristoph Kemper told me how the Access Virus came to be. He had coded a filter on a DSP and wanted to test it. Of course he needed an oscillator, so he coded that…pretty soon he had a … Continue reading
Posted in Digital Audio, Oscillators, Wavetable Oscillators
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A wavetable oscillator—Part 1
There are many ways to make an oscillator. Without looking for further motivation, I’ll propose a wavetable oscillator. Wavetables are a fairly obvious extension of the general playback of digital audio. Such oscillators are easy to understand, and their extreme … Continue reading
A wavetable oscillator—Part 2
From Part 1, we have an oscillator. But we need to broaden it to allow scaling of harmonic content based on pitch so that we have all the harmonic content we need at the low frequency end, and, as we … Continue reading
Posted in Aliasing, Digital Audio, Oscillators, Wavetable Oscillators
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A wavetable oscillator—Part 3
In Part 2, we looked at how to use subtables designed to cover one octave each, removing upper harmonics for each higher octave to avoid aliasing. Here’s a view of the nine wavetables for our sawtooth oscillator, with the starting … Continue reading
Posted in Digital Audio, Oscillators, Wavetable Oscillators
10 Comments
A wavetable oscillator—the code
The wavetable oscillator code follows the basic structure of most audio processing blocks, with three types of functions: at the start: initialization—create the oscillator and its wavetables as needed: control—change the oscillator frequency, and pulse width for PWM every sample: … Continue reading
Posted in Digital Audio, Oscillators, Source Code, Wavetable Oscillators
27 Comments
A wavetable oscillator—end notes
I wrote the wavetable oscillator code from scratch as I wrote this series of articles, using just the thought process I gave. Hence, no references to other articles on wavetable oscillators. The concept of a phase accumulator is fairly obvious; … Continue reading
Posted in Digital Audio, Oscillators, Wavetable Oscillators
13 Comments
Replicating wavetables
My WaveTableOsc object uses a series of wavetables that are copies of single-cycle waveforms pre-rendered at a progressively smaller bandwidth. By “replicating wavetables” I mean taking a full-bandwidth single cycle waveform, and using it to make a complete set of … Continue reading
Posted in Oscillators, Source Code, Wavetable Oscillators
53 Comments
Wavetable oscillator video
If you find this video helpful, let me know, and I’ll work more video demonstrations into articles.
Posted in Aliasing, Synthesizers, Video, Wavetable Oscillators
6 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
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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
6 Comments