WDF Modeling Of A Korg MS-50 Based Non-Linear Diode Bridge VCF

Maximilian Rest; Julian D. Parker; Kurt James Werner

WDF Modeling Of A Korg MS-50 Based Non-Linear Diode Bridge VCF

Maximilian Rest, Julian D. Parker, Kurt James Werner

School of Arts, English and Languages

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

8 Citations (Scopus)

502 Downloads (Pure)

Abstract

The voltage-controlled low-pass filter of the Korg MS-50 synthesizer is built around a non-linear diode bridge as the cutoff frequency control element, which greatly contributes to the sound of this vintage synthesizer. In this paper, we introduce the overall filter circuitry and give an in-depth analysis of this diode bridge. It is further shown how to turn the small signal equivalence circuit of the bridge into the necessary two-resistor configuration to uncover the underlying Sallen-Key structure. In a second step, recent advances in the field of WDFs are used to turn a simplified version of the circuit into a virtual-analog model. This model is then examined both in the small-signal linear domain as well as in the non-linear region with inputs of different amplitudes and frequencies to characterize the behavior of such diode bridges as cutoff frequency control elements.

Original language	English
Title of host publication	Proceedings of the 20th International Conference on Digital Audio Effects
Editors	Alberto Torin, Brian Hamilton, Stefan Bilbao, Michael Newton
Place of Publication	Edinburgh, UK
Pages	145–15
Number of pages	7
ISBN (Electronic)	2413-6689
Publication status	Published - 05 Sept 2017
Event	20th International Conference on Digital Audio Effects - University of Edinburgh, Edinburgh, United Kingdom Duration: 05 Sept 2017 → 09 Sept 2017 Conference number: 20 http://www.dafx17.eca.ed.ac.uk/

Conference

Conference	20th International Conference on Digital Audio Effects
Country/Territory	United Kingdom
City	Edinburgh
Period	05/09/2017 → 09/09/2017
Internet address	http://www.dafx17.eca.ed.ac.uk/

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WDF Modeling Of A Korg MS-50 Based Non-Linear Diode Bridge VCF
© 2017 The Authors. Published in the Proceedings of the 20th International Conference on Digital Audio Effects (DAFx-17). This work is made available online in accordance with the publisher’s policies. Please refer to any applicable terms of use of the publisher.
Final published version, 6.41 MBLicence: Unspecified

http://www.dafx17.eca.ed.ac.uk/papers/DAFx17_paper_88.pdfLicence: Unspecified

The 20th International Conference on Digital Audio Effects
Kurt Werner (Participant)
05 Sept 2017 → 09 Sept 2017
Activity: Participating in or organising an event types › Participation in conference

Cite this

@inproceedings{d40da739f79349a3b5474e7b612d1af9,

title = "WDF Modeling Of A Korg MS-50 Based Non-Linear Diode Bridge VCF",

abstract = "The voltage-controlled low-pass filter of the Korg MS-50 synthesizer is built around a non-linear diode bridge as the cutoff frequency control element, which greatly contributes to the sound of this vintage synthesizer. In this paper, we introduce the overall filter circuitry and give an in-depth analysis of this diode bridge. It is further shown how to turn the small signal equivalence circuit of the bridge into the necessary two-resistor configuration to uncover the underlying Sallen-Key structure. In a second step, recent advances in the field of WDFs are used to turn a simplified version of the circuit into a virtual-analog model. This model is then examined both in the small-signal linear domain as well as in the non-linear region with inputs of different amplitudes and frequencies to characterize the behavior of such diode bridges as cutoff frequency control elements.",

author = "Maximilian Rest and Parker, {Julian D.} and Werner, {Kurt James}",

year = "2017",

month = sep,

day = "5",

language = "English",

isbn = "2413-6700",

pages = "145–15",

editor = "Alberto Torin and Brian Hamilton and Stefan Bilbao and Michael Newton",

booktitle = "Proceedings of the 20th International Conference on Digital Audio Effects",

note = "20th International Conference on Digital Audio Effects ; Conference date: 05-09-2017 Through 09-09-2017",

url = "http://www.dafx17.eca.ed.ac.uk/",

}

Rest, M, Parker, JD & Werner, KJ 2017, WDF Modeling Of A Korg MS-50 Based Non-Linear Diode Bridge VCF. in A Torin, B Hamilton, S Bilbao & M Newton (eds), Proceedings of the 20th International Conference on Digital Audio Effects., 88, Edinburgh, UK, pp. 145–15, 20th International Conference on Digital Audio Effects, Edinburgh, United Kingdom, 05/09/2017. <http://www.dafx17.eca.ed.ac.uk/papers/DAFx17_paper_88.pdf>

WDF Modeling Of A Korg MS-50 Based Non-Linear Diode Bridge VCF. / Rest, Maximilian; Parker, Julian D.; Werner, Kurt James.
Proceedings of the 20th International Conference on Digital Audio Effects. ed. / Alberto Torin; Brian Hamilton; Stefan Bilbao; Michael Newton. Edinburgh, UK, 2017. p. 145–15 88.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

TY - GEN

T1 - WDF Modeling Of A Korg MS-50 Based Non-Linear Diode Bridge VCF

AU - Rest, Maximilian

AU - Parker, Julian D.

AU - Werner, Kurt James

N1 - Conference code: 20

PY - 2017/9/5

Y1 - 2017/9/5

N2 - The voltage-controlled low-pass filter of the Korg MS-50 synthesizer is built around a non-linear diode bridge as the cutoff frequency control element, which greatly contributes to the sound of this vintage synthesizer. In this paper, we introduce the overall filter circuitry and give an in-depth analysis of this diode bridge. It is further shown how to turn the small signal equivalence circuit of the bridge into the necessary two-resistor configuration to uncover the underlying Sallen-Key structure. In a second step, recent advances in the field of WDFs are used to turn a simplified version of the circuit into a virtual-analog model. This model is then examined both in the small-signal linear domain as well as in the non-linear region with inputs of different amplitudes and frequencies to characterize the behavior of such diode bridges as cutoff frequency control elements.

AB - The voltage-controlled low-pass filter of the Korg MS-50 synthesizer is built around a non-linear diode bridge as the cutoff frequency control element, which greatly contributes to the sound of this vintage synthesizer. In this paper, we introduce the overall filter circuitry and give an in-depth analysis of this diode bridge. It is further shown how to turn the small signal equivalence circuit of the bridge into the necessary two-resistor configuration to uncover the underlying Sallen-Key structure. In a second step, recent advances in the field of WDFs are used to turn a simplified version of the circuit into a virtual-analog model. This model is then examined both in the small-signal linear domain as well as in the non-linear region with inputs of different amplitudes and frequencies to characterize the behavior of such diode bridges as cutoff frequency control elements.

M3 - Conference contribution

SN - 2413-6700

SP - 145

EP - 115

BT - Proceedings of the 20th International Conference on Digital Audio Effects

A2 - Torin, Alberto

A2 - Hamilton, Brian

A2 - Bilbao, Stefan

A2 - Newton, Michael

CY - Edinburgh, UK

T2 - 20th International Conference on Digital Audio Effects

Y2 - 5 September 2017 through 9 September 2017

ER -

WDF Modeling Of A Korg MS-50 Based Non-Linear Diode Bridge VCF

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The 20th International Conference on Digital Audio Effects

Cite this