Thesis (MScEng) -- University of Stellenbosch, 2004. / ENGLISH ABSTRACT: In a pioneering project for the University of Stellenbosch, and indeed South Africa, an
automatic music transcription system was designed to explore the underlying theory,
concepts and problematies of polyphonic music transcription.
Automatic music transcription involves knowledge from the fields of acoustics, music
theory, digital signal processing and information theory. The key concepts from these
contributing fields as they relate to transcription systems are described in overview. A
transcription system is then developed which includes components for FFT-based multipitch
estimation, basic post-processing, estimation of the degree of polyphony, key determination,
note duration quantisation and score output. The operation of the system is
explained and tested at the hand of a synthetic polyphonic signal.
The system produced usable transcriptions of real monophonic input signals to scores
with standard notational symbols. The success of the system (as are the successes of
all published polyphonic transcription systems) was limited for real polyphonic music
signals. Nonetheless, the initial results are encouraging and indicate that the current
implementation can serve as a platform for a more sophisticated and accurate system. / AFRIKAANSE OPSOMMING: In 'n baanbrekersprojek vir die Universiteit van Stellenbosch (en die breër Suid-Afrika) is
'n outomatiese musiek transkripsie stelselontwerp om die onderliggende teorie, konsepte
en problematiek van polifoniese musiek transkripsie te ondersoek.
Outomatiese musiek transkripsie kombineer kennis uit die navorsingsvelde van akoestiek,
musiekteorie, syferseinverwerking en informasieteorie. Die sluitelkonsepte van elkeen van
hierdie velde word kortliks weergegee soos dit van toepassing is op transkripsie stelsels.
'n Transkripsie stelsel met modules vir FFT-gebaseerde afskatting van polifoniese toonhoogtes,
basiese naverwerking, afskatting van die graad van polifonie, bepaling van die
sleutel, nootlengte kwantisering en bladmusiek notasie word aansluitend ontwikkel. Die
werkswyse van die stelsel word aan hand van 'n sintetiese polifoniese sein verduidelik en
getoets.
Die stelsel lewer bruikbare transkripsies van enkelstemmige intreeseine na bladmusiek
met standaard musieksimbole. Die sukses van die stelsel is beperk vir polifoniese musiek,
soos ook die algemene geval is vir ander gepubliseerde meerstemmige transkripsie stelsels.
Tog is die aanvanklike resultate belowend, met aanduidings dat die huidige implementering
kan dien as 'n beginpunt vir die ontwikkeling van 'n meer gesofistikeerde en akkurate
stelsel.
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:sun/oai:scholar.sun.ac.za:10019.1/53727 |
| Date | 04 1900 |
| Creators | Matthaei, Peter E |
| Contributors | Lourens, J. G., Herbst, T., Stellenbosch University. Faculty of Engineering. Dept. of Electrical and Electronic Engineering. |
| Publisher | Stellenbosch : Stellenbosch University |
| Source Sets | South African National ETD Portal |
| Language | en_ZA |
| Detected Language | Unknown |
| Type | Thesis |
| Format | 124 p. : ill. |
| Rights | Stellenbosch University |
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