| Synthesis of sinusoids via non-overlapping inverse Fourier transform (1999) | |||||||||||||||
Abstract | |||||||||||||||
| Additive synthesis is a powerful tool for the analysis/modification/synthesis of complex audio or speech signals. However, the cost of wavetable sinusoidal synthesis can become prohibitive for large numbers of sinusoids (more than a few hundred). In that case, techniques based on the inverse Fourier transform offer an attractive alternative, being 200% to 300% more efficient than wavetable synthesis depending on the number of sinusoids. This paper presents an improved technique based on the concatenation of shortterm signals obtained by inverse Fourier transforms. By contrast with the standard overlap-add technique, the new algorithm requires synthesizing sinusoids in the frequency domain whose time-domain amplitudes vary linearly within the synthesis frame. The technique is shown to achieve higher quality than the standard overlap-add technique, at the cost of a small increase in computation. | |||||||||||||||
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