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Tekijä:Thuillier, Etienne
Työn nimi:Real-Time Polyphonic Octave Doubling for the Guitar
Julkaisutyyppi:Diplomityö
Julkaisuvuosi:2016
Sivut:(7) + 66      Kieli:   eng
Koulu/Laitos/Osasto:Sähkötekniikan korkeakoulu
Oppiaine:Akustiikka ja äänenkäsittely   (S3004)
Valvoja:Välimäki, Vesa
Ohjaaja:Kargo, Jens Peter
Elektroninen julkaisu: http://urn.fi/URN:NBN:fi:aalto-201604201818
Sijainti:P1 Ark Aalto  3690   | Arkisto
Avainsanat:real-time
pitch-shifting
multi-resolution
sub-band
modulation
roughness
Tiivistelmä (eng):This thesis studies digital signal processing solutions for enriching live guitar sound by way of mixing-in octave-doubled versions of the chords and melodies performed on the instrument in real-time.
Following a review of techniques applicable for real-time polyphonic octave doubling, four candidate solutions are proposed, amongst which two novel methods: ERB-PS2 and ERB-SSM2.
Performance of said candidates is compared to that of three state of the art effect pedal offerings of the market.
In particular, an evaluation of the added roughness and transient alterations introduced by each solution in the output sound is conducted.
The ERB-PS2 method, which consists in doubling the instantaneous phases of the sub-bands signals extracted with a constant-ERB-bandwidth non-decimated IIR filter bank, is found to provide the best overall performance amongst the candidates.
This novel solution provides greatly reduced latency compared to the baseline pedals, with comparable, and in some case improved, sound quality.
ED:2016-05-01
INSSI tietueen numero: 53452
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