- Spectral modelling synthesis
Spectral Modeling Synthesis or simply SMS is an Acousic modeling approach for speech and other signals.
SMS considers
sounds as a combination of harmonic content andnoise content. Harmonic components are identified based on peaks in thefrequency spectrum of the signal, normally as found by the short-time Fourier transform. The signal that remains following removal of the spectral components, sometimes referred to as the residual, is then modeled as white noise passed through a time-varying filter. The output of the model, then, are the frequencies and levels of the detected harmonic components and thecoefficients of the time-varying filter.Intuitively, the model can be applied to many types of audio signals. Speech signals, for example, include slowly-changing harmonic sounds caused by vibration of the
vocal cords plus wideband, noise-like sounds caused by the lips and mouth. Musical instruments also produce sounds containing both harmonic componenents and percussive, noise-like sounds when the notes are struck or changed.See also
* Speech coding
* CELP
* Source-filter model of speech production
*Frequency_modulation_synthesis References
cite web
url=http://www.iua.upf.es/~xserra/presentacions/ Spectral-Modeling-Synthesis-Past-and-Present.pdf
title= Spectral Modeling Synthesis: Past and Present
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url=http://www.iua.upf.es/~sms/
title= Spectral Modeling Synthesis Homepage
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url=http://ccrma.stanford.edu/~jos/jnmr/Spectral_Modeling.html
title= Spectral Modeling
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author= Julius O. Smith III
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