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arXiv · 2608.27648

Alias-Free Oscillator Synchronization via Additive Synthesis

Jonas Roth·Domenic Keller·Oscar Castañeda·Christoph Studer
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Abstract

Oscillator synchronization is a widely used sound-synthesis technique, but straightforward digital implementations suffer from aliasing artifacts. This paper presents an alias-free method for digital emulation of oscillator synchronization of arbitrary periodic waveforms based on additive synthesis. Starting from a finite set of Fourier-series coefficients representing a bandlimited free-running waveform, we derive linear spectral-resampling transforms that map these coefficients to those of the bandlimited synchronized waveform. Beyond conventional hard synchronization, the proposed approach also supports two additional soft-synchronization modes. To address the high computational complexity of the proposed method, we introduce HASY, a 6 mm^2 application-specific integrated circuit (ASIC) fabricated in 65 nm CMOS technology. HASY generates one 96 kHz, 24 bit alias-free synchronized waveform with up to 512 harmonics and computes the spectral-resampling transform within only five audio-sample periods.

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Jonas Roth, Domenic Keller, Oscar Castañeda, Christoph Studer. 2026-08-27. Alias-Free Oscillator Synchronization via Additive Synthesis. https://arxiv.org/abs/2608.27648

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