Presented here is a new additive synthesis method based on spectral envelopes and inverse fast Fourier transform (FFT-1). User control is facilitated by the use of spectral envelopes to describe the characteristics of the short term spectrum of the sound in terms of sinusoidal and noise components. Such characteristics can be given by users or obtained automatically from natural sounds. Use of the inverse FFT reduces the computation cost by a factor on the order of 15 compared to oscillators. Proposed is a low-cost real-time synthesizer design allowing processing of recorded and live sounds, synthesis of instruments, and synthesis of speech and the singing voice.
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https://aes2.org/publications/elibrary-page/?id=6740
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