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The Skipproof virtual turntable for high-level control of scratching
KTH, School of Computer Science and Communication (CSC), Media Technology and Interaction Design, MID. KTH, School of Computer Science and Communication (CSC), Speech, Music and Hearing, TMH, Music Acoustics. (Sound and Music Computing)ORCID iD: 0000-0003-4259-484X
KTH, School of Computer Science and Communication (CSC), Speech, Music and Hearing, TMH, Music Acoustics.ORCID iD: 0000-0002-3086-0322
2010 (English)In: Computer music journal, ISSN 0148-9267, E-ISSN 1531-5169, Vol. 34, no 2, 39-50 p.Article in journal (Refereed) Published
Abstract [en]

A background on scratching and disc jockey (DJ) interfaces is presented, Skipproof application is described, performance situations where Skipproof is used are presented, and current implementations and possible future uses of Skipproof are discussed. DJing has grown from record players, turntables, and vinyl records to the use of product catalog of commercial physical controllers with other sound formats and sequencer-based interfaces with non-real-time interaction. Skipproof provides the main functionality of a turntable and a mixer, allowing a user to play different sound samples and alter the speed and amplitude manually. Skipproof is used in GUI and visual feedback, sensor and parameter mapping, and audio. The use of radio Baton as the turntable controller in a public performance featuring the Skipproof software showed problems due to the lack of beat synchronization of the scratch techniques and the impossibility of setting a general tempo.

Place, publisher, year, edition, pages
MIT Press, 2010. Vol. 34, no 2, 39-50 p.
Keyword [en]
Computer Science, Interdisciplinary Applications; Music
National Category
Computer Science Human Computer Interaction Music
URN: urn:nbn:se:kth:diva-11924DOI: 10.1162/comj.2010.34.2.39ISI: 000279398400003ScopusID: 2-s2.0-77954680435OAI: diva2:290106

QC20101217 från in press till published 20101217. QC 20160115

Available from: 2010-01-26 Created: 2010-01-26 Last updated: 2016-01-15Bibliographically approved
In thesis
1. The acoustics and performance of DJ scratching, Analysis and modelling
Open this publication in new window or tab >>The acoustics and performance of DJ scratching, Analysis and modelling
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis focuses on the analysis and modeling of scratching, in other words, the DJ (disk jockey) practice of using the turntable as a musical instrument. There has been experimental use of turntables as musical instruments since their invention, but the use is now mainly ascribed to the musical genre hip-hop and the playing style known as scratching. Scratching has developed to become a skillful instrument-playing practice with complex musical output performed by DJs. The impact on popular music culture has been significant, and for many, the DJ set-up of turntables and a mixer is now a natural instrument choice for undertaking a creative music activity. Six papers are included in this thesis, where the first three approach the acoustics and performance of scratching, and the second three approach scratch modeling and the DJ interface. Additional studies included here expand on the scope of the papers.

For the acoustics and performance studies, DJs were recorded playing both demonstrations of standard performance techniques, and expressive performances on sensor-equipped instruments. Analysis of the data revealed that there are both differences and commonalities in playing strategies between musicians, and between expressive intentions. One characteristic feature of scratching is the range of standard playing techniques, but in performances it seems DJs vary the combination of playing techniques more than the rendering of these techniques. The third study describes some of the acoustic parameters of typical scratch improvisations and looks at which musical parameters are typically used for expressive performances. Extracted acoustic and performance parameters from the data show the functional ranges within which DJs normally play.

Unlike traditional musical instruments, the equipment used for scratching was not intended to be used for creating music. The interface studies focus on traditional as well as new interfaces for DJs, where parameter mappings between input gestures and output signal are described. Standard performance techniques have been modeled in software called Skipproof, based on results from the first papers. Skipproof was used for testing other types of controllers than turntables, where complex DJ gestures could be manipulated using simplified control actions, enabling even non-experts to play expressively within the stylistic boundaries of DJ scratching. The last paper describes an experiment of using an existing hardware platform, the Reactable, to help designing and prototyping the interaction between different sound models and instrument interfaces, including scratching and Skipproof.

In addition to the included papers, studies were conducted of expressivity, description of the emotional contents of scratching, DJ playing activities, and the coupling between playing techniques and sample. The physical affordances of the turntable, mixer and samples, as well as genre conventions of hip-hop, are assumed to explain some of the findings that distinguish scratching from other instrumental sounds or practices.

Place, publisher, year, edition, pages
Stockholm: KTH, 2010. xii, 74 p.
Trita-CSC-A, ISSN 1653-5723 ; 2010:01
National Category
Fluid Mechanics and Acoustics Other Veterinary Science
urn:nbn:se:kth:diva-11927 (URN)978-91-7415-541-9 (ISBN)
Public defence
2010-02-12, Sal F2, Lindstedtsvägen 26, KTH, Stockholm, 10:00 (English)
QC20100729Available from: 2010-01-26 Created: 2010-01-26 Last updated: 2010-07-29Bibliographically approved

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