Circuit modeling studies related to guitars and audio processing

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.advisor Pakarinen, Jyri, PhD, Dolby Laboratories, Sweden Dias de Paiva, Rafael 2013-10-23T09:00:57Z 2013-10-23T09:00:57Z 2013
dc.identifier.isbn 978-952-60-5388-2 (electronic)
dc.identifier.isbn 978-952-60-5387-5 (printed)
dc.identifier.issn 1799-4942 (electronic)
dc.identifier.issn 1799-4934 (printed)
dc.identifier.issn 1799-4934 (ISSN-L)
dc.description.abstract This thesis addresses the use of circuit modeling techniques in audio. Circuit modeling has a wide range of applications in audio, including real-time models of analog electronic audio equipment and the use of physical analogies for understanding and simulating musical instru-ments. Modeling of analog audio equipment is an important topic in audio signal processing. It enables the development of musical software that is capable of simulating rare vintage equip-ment at a low cost. This type of software can be embedded in portable electronic equipment, in mobile phones or tablets, or in computers. This thesis presents novel models of analog audio equipment used with guitars. It presents a nonlinear audio-transformer model which is used for real-time emulation of vacuum-tube guitar amplifiers. This model has shown that some audio transformers have nonlinear effects for input signals with frequencies below 100 Hz. A new wave-digital model for operational amplifiers is proposed, which is used to simulate a wide class of guitar distortion circuits. The same distortion circuits were modeled with a novel method based on nonlinear system identi-fication, which is enhanced using principal component analysis (PCA) for reduced complexity. It was shown that the proposed method reduces the complexity of the polynomial-Hammer-stein model obtained with the swept-sine technique by 66 %. Additionally, electromagnetic pickups were analyzed and modeled, leading to new pickup-mixing and nonlinearity models and to a better understanding on the effects of guitar pickup and cable interaction. This thesis has also presented how to use physical analogies for audio synthesis. Electro-acous-tic analogies were used in order to obtain a model of connected Helmholtz resonators, resulting in the so called Helmholtz resonator tree. This model was implemented using wave-digital filters, which enables musical synthesis using physical descriptors that are intuitive also for non-technical users. This thesis includes contributions for the application of circuit modeling techniques in audio. The audio transformer, electromagnetic pickup, and effect-box modeling developments are important for building real-time systems for audio effects and for preserving the heritage of vintage analog equipment. Finally, the electro-acoustic analogies presented show that circuit modeling can be used for abstract musical synthesis, where a virtual instrument can be excited in different manners yielding interesting timbre variations. en
dc.format.extent 90 + app. 80
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher Aalto University en
dc.publisher Aalto-yliopisto fi
dc.relation.ispartofseries Aalto University publication series DOCTORAL DISSERTATIONS en
dc.relation.ispartofseries 167/2013
dc.relation.haspart [Publication 1]: R. C. D. Paiva, J. Pakarinen and V. Välimäki. Acoustics and modeling of pickups. J. Audio Engineering Society, vol. 60, no 10, pp. 768-782, Oct. 2012
dc.relation.haspart [Publication 2]: R. C. D. Paiva and H. Penttinen. Cable matters: Instrument cables affect the frequency response of electric guitars. In Proc. 131st Audio Engineering Society Conv., New York, USA, paper number 8466, Oct. 2011.
dc.relation.haspart [Publication 3]: R. C. D. Paiva, J. Pakarinen, V. Välimäki and M. Tikander. Real-time audio transformer emulation for virtual tube amplifiers. EURASIP J. Advances Signal Processing, pp. 1-15, Feb. 2011.
dc.relation.haspart [Publication 4]: R. C. D. Paiva, S. D'Angelo, J. Pakarinen and V. Välimäki. Emulation of operational amplifiers and diodes in audio distortion circuits. IEEE Trans. Circuits and Systems - Part II, Express Briefs, vol. 59, no. 10, pp. 688-692, Oct. 2012.
dc.relation.haspart [Publication 5]: R. C. D. Paiva, J. Pakarinen and V. Välimäki. Reduced-complexity modeling of high-order nonlinear audio systems using swept-sine and principal component analysis. In Proc. AES 45th Conf. Applications of Time-Frequency Processing in Audio, Espoo, Finland, pp. 1-4, Mar. 2012.
dc.relation.haspart [Publication 6]: R. C. D. Paiva and V. Välimäki. The Helmholtz resonator tree. In Proc. DAFx'12, 15th Int. Conf. Digital Audio Effects, York, UK, pp. 413-420, Sep. 2012.
dc.subject.other Acoustics
dc.subject.other Electrical engineering
dc.title Circuit modeling studies related to guitars and audio processing en
dc.type G5 Artikkeliväitöskirja fi Sähkötekniikan korkeakoulu fi School of Electrical Engineering en
dc.contributor.department Signaalinkäsittelyn ja akustiikan laitos fi
dc.contributor.department Department of Signal Processing and Acoustics en
dc.subject.keyword nonlinear circuits en
dc.subject.keyword audio systems en
dc.subject.keyword real-time systems en
dc.subject.keyword circuit simulation en
dc.subject.keyword computer generated music en
dc.identifier.urn URN:ISBN:978-952-60-5388-2
dc.type.dcmitype text en
dc.type.ontasot Doctoral dissertation (article-based) en
dc.type.ontasot Väitöskirja (artikkeli) fi
dc.contributor.supervisor Välimäki, Vesa, Prof., Aalto University, Department of Signal Processing and Acoustics, Finland
dc.opn Hélie, Thomas, Dr., IRCAM, France
dc.contributor.lab Laboratory of Acoustics and Audio Signal Processing en
dc.rev Sarti, Augusto, Prof., Politecnico di Milano, Italy
dc.rev Holters, Martin, Dr., Helmut Schmidt University, Germany 2013-11-08

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