Flutter Echo Modeling

Gloria Dal Santo; Karolina Prawda; Vesa Välimäki

Flutter Echo Modeling

Gloria Dal Santo^*, Karolina Prawda, Vesa Välimäki

^*Corresponding author for this work

Audio Signal Processing

Ècole Polytechnique Fédérale de Lausanne

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

61 Downloads (Pure)

Abstract

Flutter echo is a well-known acoustic phenomenon that occurs when sound waves bounce between two parallel reflective surfaces, creating a repetitive sound. In this work, we introduce a method to recreate flutter echo as an audio effect. The proposed algorithm is based on a feedback structure utilizing velvet noise that aims to synthesize the fluttery components of a reference room impulse response presenting flutter echo. Among these, the repetition time defines the length of the delay line in a feedback filter. The specific spectral properties of the flutter are obtained with a bandpass attenuation filter and a ripple filter, which enhances the harmonic behavior of the sound. Additional temporal shaping of a velvet-noise filter, which processes the output of the feedback loop, is performed based on the properties of the reference flutter. The comparison between synthetic and measured flutter echo impulse responses shows good agreement in terms of both the repetition time and reverberation time values.

Original language	English
Title of host publication	Proceedings of the 25th International Conference on Digital Audio Effects (DAFx20in22)
Place of Publication	Vienna, Austria
Publisher	Universität für Musik und darstellende Kunst Wien
Pages	185-191
Number of pages	7
ISBN (Print)	978-3-200-08599-2
Publication status	Published - 6 Sept 2022
MoE publication type	A4 Conference publication
Event	International Conference on Digital Audio Effects - University of Music and Performing Arts Vienna, Vienna, Austria Duration: 7 Sept 2022 → 9 Sept 2022 Conference number: 25 https://dafx2020.mdw.ac.at/DAFx20in22/ https://dafx2020.mdw.ac.at/DAFx20in22/index.html

Publication series

Name	Proceedings of the International Conference on Digital Audio Effects
ISSN (Print)	2413-6700
ISSN (Electronic)	2413-6689

Conference

Conference	International Conference on Digital Audio Effects
Abbreviated title	DAFx
Country/Territory	Austria
City	Vienna
Period	07/09/2022 → 09/09/2022
Internet address	https://dafx2020.mdw.ac.at/DAFx20in22/ https://dafx2020.mdw.ac.at/DAFx20in22/index.html

Keywords

audio signal processing
digital filter
artificial reverberation
reverb algorithm
flutter echo

Access to Document

DAFx20in22_paper_27Final published version, 1.51 MBLicence: CC BY

https://dafx2020.mdw.ac.at/proceedings/papers/DAFx20in22_paper_27.pdfLicence: CC BY

NordicSMC: Nordic Sound and Music Computing Network
Välimäki, V. (Principal investigator), Louise, B. (Project Member), Fagerström, J. (Project Member) & Prawda, K. (Project Member)
01/01/2018 → 31/12/2023
Project: Other external funding: Other foreign funding

Aalto Acoustics Lab
Pulkki, V. (Manager)
School of Electrical Engineering
Facility/equipment: Facility

Cite this

Dal Santo, G., Prawda, K., & Välimäki, V. (2022). Flutter Echo Modeling. In Proceedings of the 25th International Conference on Digital Audio Effects (DAFx20in22) (pp. 185-191). Article 27 (Proceedings of the International Conference on Digital Audio Effects). Universität für Musik und darstellende Kunst Wien. https://dafx2020.mdw.ac.at/proceedings/papers/DAFx20in22_paper_27.pdf

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title = "Flutter Echo Modeling",

abstract = "Flutter echo is a well-known acoustic phenomenon that occurs when sound waves bounce between two parallel reflective surfaces, creating a repetitive sound. In this work, we introduce a method to recreate flutter echo as an audio effect. The proposed algorithm is based on a feedback structure utilizing velvet noise that aims to synthesize the fluttery components of a reference room impulse response presenting flutter echo. Among these, the repetition time defines the length of the delay line in a feedback filter. The specific spectral properties of the flutter are obtained with a bandpass attenuation filter and a ripple filter, which enhances the harmonic behavior of the sound. Additional temporal shaping of a velvet-noise filter, which processes the output of the feedback loop, is performed based on the properties of the reference flutter. The comparison between synthetic and measured flutter echo impulse responses shows good agreement in terms of both the repetition time and reverberation time values.",

keywords = "audio signal processing, digital filter, artificial reverberation, reverb algorithm, flutter echo",

author = "{Dal Santo}, Gloria and Karolina Prawda and Vesa V{\"a}lim{\"a}ki",

year = "2022",

month = sep,

day = "6",

language = "English",

isbn = "978-3-200-08599-2",

series = "Proceedings of the International Conference on Digital Audio Effects",

publisher = "Universit{\"a}t f{\"u}r Musik und darstellende Kunst Wien",

pages = "185--191",

booktitle = "Proceedings of the 25th International Conference on Digital Audio Effects (DAFx20in22)",

address = "Austria",

note = "International Conference on Digital Audio Effects, DAFx ; Conference date: 07-09-2022 Through 09-09-2022",

url = "https://dafx2020.mdw.ac.at/DAFx20in22/, https://dafx2020.mdw.ac.at/DAFx20in22/index.html",

}

Dal Santo, G , Prawda, K & Välimäki, V 2022, Flutter Echo Modeling. in Proceedings of the 25th International Conference on Digital Audio Effects (DAFx20in22)., 27, Proceedings of the International Conference on Digital Audio Effects, Universität für Musik und darstellende Kunst Wien, Vienna, Austria, pp. 185-191, International Conference on Digital Audio Effects, Vienna, Austria, 07/09/2022. <https://dafx2020.mdw.ac.at/proceedings/papers/DAFx20in22_paper_27.pdf>

Flutter Echo Modeling. / Dal Santo, Gloria ; Prawda, Karolina ; Välimäki, Vesa.
Proceedings of the 25th International Conference on Digital Audio Effects (DAFx20in22). Vienna, Austria: Universität für Musik und darstellende Kunst Wien, 2022. p. 185-191 27 (Proceedings of the International Conference on Digital Audio Effects).

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

TY - GEN

T1 - Flutter Echo Modeling

AU - Dal Santo, Gloria

AU - Prawda, Karolina

AU - Välimäki, Vesa

N1 - Conference code: 25

PY - 2022/9/6

Y1 - 2022/9/6

N2 - Flutter echo is a well-known acoustic phenomenon that occurs when sound waves bounce between two parallel reflective surfaces, creating a repetitive sound. In this work, we introduce a method to recreate flutter echo as an audio effect. The proposed algorithm is based on a feedback structure utilizing velvet noise that aims to synthesize the fluttery components of a reference room impulse response presenting flutter echo. Among these, the repetition time defines the length of the delay line in a feedback filter. The specific spectral properties of the flutter are obtained with a bandpass attenuation filter and a ripple filter, which enhances the harmonic behavior of the sound. Additional temporal shaping of a velvet-noise filter, which processes the output of the feedback loop, is performed based on the properties of the reference flutter. The comparison between synthetic and measured flutter echo impulse responses shows good agreement in terms of both the repetition time and reverberation time values.

AB - Flutter echo is a well-known acoustic phenomenon that occurs when sound waves bounce between two parallel reflective surfaces, creating a repetitive sound. In this work, we introduce a method to recreate flutter echo as an audio effect. The proposed algorithm is based on a feedback structure utilizing velvet noise that aims to synthesize the fluttery components of a reference room impulse response presenting flutter echo. Among these, the repetition time defines the length of the delay line in a feedback filter. The specific spectral properties of the flutter are obtained with a bandpass attenuation filter and a ripple filter, which enhances the harmonic behavior of the sound. Additional temporal shaping of a velvet-noise filter, which processes the output of the feedback loop, is performed based on the properties of the reference flutter. The comparison between synthetic and measured flutter echo impulse responses shows good agreement in terms of both the repetition time and reverberation time values.

KW - audio signal processing

KW - digital filter

KW - artificial reverberation

KW - reverb algorithm

KW - flutter echo

M3 - Conference article in proceedings

SN - 978-3-200-08599-2

T3 - Proceedings of the International Conference on Digital Audio Effects

SP - 185

EP - 191

BT - Proceedings of the 25th International Conference on Digital Audio Effects (DAFx20in22)

PB - Universität für Musik und darstellende Kunst Wien

CY - Vienna, Austria

T2 - International Conference on Digital Audio Effects

Y2 - 7 September 2022 through 9 September 2022

ER -

Flutter Echo Modeling

Abstract

Publication series

Conference

Keywords

Access to Document

Fingerprint

Projects

NordicSMC: Nordic Sound and Music Computing Network

Equipment

Aalto Acoustics Lab

Cite this