AI 中文总结
针对直接数字振荡器同步存在混叠伪影的问题，提出基于加法合成的无混叠同步方法，设计专用ASIC芯片HASY实现高效运算，生成符合指标的无混叠同步波形。
AI 中文摘要
振荡器同步是一种广泛应用的声音合成技术，但直接的数字实现会产生混叠伪影。本文提出一种基于加法合成的无混叠方法，用于数字仿真任意周期波形的振荡器同步。从表示带限自由运行波形的有限傅里叶级数系数出发，推导线性频谱重采样变换，将这些系数映射为带限同步波形的系数。除传统硬同步外，该方法还支持两种额外的软同步模式。为解决该方法的高计算复杂度，本文介绍HASY——一款采用65 nm CMOS工艺制造、面积为6 mm²的专用集成电路（ASIC）。HASY可生成一个96 kHz、24位、含最多512次谐波的无混叠同步波形，且仅需5个音频采样周期即可完成频谱重采样变换计算。
英文摘要
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.
CommentsTo be presented at DAFx26
