11_synthesis

11_synthesis - Synthesis Techniques Juan P Bello Synthesis...

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Unformatted text preview: Synthesis Techniques Juan P Bello Synthesis It implies the artificial construction of a complex body by combining its elements. Complex body: acoustic signal ( sound ) Elements: parameters and/or basic signals Motivations: Reproduce existing sounds Reproduce the physical process of sound generation Generate new pleasant sounds Control/explore timbre Model / representation Sound Synthesis How can I generate new sounds? Filter Oscillator Envelope vibrato Pitch Trigger Cutoff freq Gain Sound Networks of basic elements synthesis techniques Two main types: linear and non-linear Additive Synthesis It is based on the idea that complex waveforms can be created by the addition of simpler ones. It is a linear technique, i.e. do not create frequency components that were not explicitly contained in the original waveforms Commonly, these simpler signals are sinusoids (sines or cosines) with time-varying parameters, according to Fouriers theory: ( ) ! = + = 2 sin ) ( i i i i t f A t s " # Amp 1 (t) Freq 1 (t) Amp 2 (t) Freq 2 (t) Amp N (t) Freq N (t) Additive Synthesis: A Pipe Organ Additive Synthesis Square wave: only odd harmonics. Amplitude of the n th harmonic = 1/n Time-varying sounds Amp Freq Amp 1 (t) Freq 1 (t) Amp Freq Amp 2 (t) Freq 2 (t) Amp Freq Amp N (t) Freq N (t) According to Fourier, all sounds can be described and reproduced with additive synthesis. Even impulse-like components can be represented by using a short-lived sinusoid with infinite amplitude....
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This note was uploaded on 03/03/2012 for the course FMT E85 taught by Professor Juanpablobello during the Fall '09 term at NYU.

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11_synthesis - Synthesis Techniques Juan P Bello Synthesis...

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