Guitar Synthesizer Design Using MatLab

Luis Joaquín Molina VinagreAlberto Serna Martín

4th Course. Digital Audio.BSc Image & Sound Engineering

Index.

Introduction. Time analysis. Frequency analysis. Synthesis. Synthesizer interface. Demo.

Introduction.

Introduction.

What`s a synthesizer?

Introduction.

Our objective? Software synthesizer.

Basis. EADGBE Standard Tuning.

function [y]= envelopeG (L,fs) attack=0:1/(0.03*fs):1-1/fs;midtime=0.03:1/fs:(L-0.06*fs)/fs;other = 0.0798.*midtime.^(-0.909); ... y=fullenvelope;

end

Introduction.

Requisites. Note selection. Octave selection. Figure selection. From half-note to

semiquaver.

Extra. Graphical interface. [GUIDE] Tempo selection.

Time analysis.

Time analysis.

Envelope detector.

Time analysis.

Envelope detector. Results.

Time analysis.

Envelope comparison.

Time analysis.

Envelope. Decay time obtaining.

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 50

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1f(x) = 0.0801581562094017 x^-0.903047052287775R² = 0.983609406039898

Real E Envelope

Time [s]

Am

plitu

de [

N.U

.]

Frequency analysis.

Frequency analysis.

Initial problems. Harmonics vary a lot, even if they`re closer

in the chromatic scale. Solution.

Obtain harmonic contribution. Associated frequencies. Additive synthesis. Stationary wave

generation. FFT for comparison.

Frequency analysis.

Obtain harmonic contribution per interval.

Frequency analysis.

FFT for comparison.

Frequency analysis.

Objective. “Codebook” generation. [CELP]

Note. Octave.

Synthesis.

Synthesis.

Synthesis.

Results.

But… How does this sound like?

Synthesizer interface.

Synthesizer interface.

Demo.

Thanks for watching!