Discrete-time synthesis of the sawtooth waveform with reduced aliasing
Discrete-time synthesis of the sawtooth waveform with reduced aliasing
复制标题
减少混叠的锯齿波形的离散时间合成
DOI：
10.1109/lsp.2004.842271
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发表时间：
2005
影响因子：
3.9
通讯作者：
V. Välimäki
中科院分区：
文献类型：
--
作者：
V. Välimäki
提出了一种用于生成锯齿波的有效信号处理算法。该算法改进了普通波形采样方法，该方法因混叠而导致音质较差。新算法的基本版本可区分分段抛物线波形。该算法的另一个版本在微分之前使用简单的滤波器对抛物线波进行过采样和抽取。与普通方法相比，这两种算法变体的信噪比 (SNR) 分别提高了 10 和 15 dB。感知加权信噪比表明主观改善更大。所提出的方法适用于减法声音合成的数字信号处理器（DSP）实现。
An efficient signal processing algorithm for generating a sawtooth waveform is proposed. The algorithm improves the trivial waveform sampling method, which suffers from low sound quality due to aliasing. The basic version of the new algorithm differentiates a piecewise parabolic waveform. Another version of the algorithm oversamples and decimates the parabolic wave with a simple filter prior to differentiation. The two algorithm variants improve the signal-to-noise ratio (SNR) over the trivial method by 10 and 15 dB, respectively. A perceptually weighted SNR suggests a larger subjective improvement. The proposed methods are applicable in a digital signal processor (DSP) implementation of subtractive sound synthesis.