Slides from the Guitar Synthesizer Project for the Degree "Telecommunication Engineering: Sound and Image" of the University of Extremadura. December of 2012.

1. Luis Joaquín Molina Vinagre
Alberto Serna Martín
4th Course. Digital Audio.
BSc Image & Sound Engineering
Guitar Synthesizer Design Using MatLab

2. Index.






Introduction.
Time analysis.
Frequency analysis.
Synthesis.
Synthesizer interface.
Demo.

3. Introduction.

4. Introduction.

What`s a synthesizer?

5. Introduction.

Our objective?
 Software
synthesizer.
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

Basis.
 EADGBE
Standard Tuning.

6. Introduction.

Requisites.
 Note
selection.
 Octave selection.
 Figure selection. From half-note to semiquaver.

Extra.
 Graphical
interface. [GUIDE]
 Tempo selection.

7. Time analysis.

8. Time analysis.

Envelope detector.

9. Time analysis.

Envelope detector. Results.

10. Time analysis.

Envelope comparison.

11. Time analysis.
Envelope. Decay time obtaining.
Real E Envelope
1
0.9
0.8
Amplitude [N.U.]

0.7
y = 0.080x-0.90
R² = 0.983
0.6
0.5
0.4
0.3
0.2
0.1
0
0
0.5
1
1.5
2
2.5
Time [s]
3
3.5
4
4.5
5

12. Frequency analysis.

13. 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.

14. Frequency analysis.

Obtain harmonic contribution per interval.

15. Frequency analysis.

FFT for comparison.

16. Frequency analysis.

Objective.
 “Codebook”
 Note.
 Octave.
generation. [CELP]

17. Synthesis.

18. Synthesis.

19. Synthesis.

Results.

But… How does this sound like?

20. Synthesizer interface.

21. Synthesizer interface.

22. Demo.