Graphic Delay Equalizer

J. Rämö; V. Välimäki

doi:10.1109/ICASSP.2019.8682949

Graphic Delay Equalizer

Audio Signal Processing

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

7 Citations (Scopus)

325 Downloads (Pure)

Abstract

A graphic delay equalizer based on a high-order nonparametric allpass filter design is proposed. Command points at the centers of octave frequency bands are connected with polynomial interpolation to form a continuous target group-delay curve as function of frequency. The required number of all-pass sections depends on the area under the target curve. The group-delay area at low audio frequencies is small due to the linear frequency scale, so only a few allpass sections can be assigned there, which reduces the accuracy. Design accuracy can be improved by adding a constant delay to the target curve, which increases the area. Two use cases are presented: the group-delay equalization of a multi-way loudspeaker and the linearization of the phase response of a regular magnitude-only graphic equalizer. The graphic delay equalizer can be used to enhance the perceptual quality of audio systems or to produce audio effects.

Original language	English
Title of host publication	44th IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2019; Brighton; United Kingdom; 12-17 May 2019 : Proceedings
Publisher	IEEE
Pages	8018-8022
Number of pages	5
ISBN (Electronic)	978-1-4799-8131-1
ISBN (Print)	978-1-4799-8132-8
DOIs	https://doi.org/10.1109/ICASSP.2019.8682949
Publication status	Published - 1 May 2019
MoE publication type	A4 Conference publication
Event	IEEE International Conference on Acoustics, Speech, and Signal Processing - Brighton, United Kingdom Duration: 12 May 2019 → 17 May 2019 Conference number: 44

Publication series

Name	Proceedings of the IEEE International Conference on Acoustics, Speech, and Signal Processing
ISSN (Print)	1520-6149
ISSN (Electronic)	2379-190X

Conference

Conference	IEEE International Conference on Acoustics, Speech, and Signal Processing
Abbreviated title	ICASSP
Country/Territory	United Kingdom
City	Brighton
Period	12/05/2019 → 17/05/2019

Keywords

Delays
Equalizers
Graphics
Loudspeakers
Acoustics
Interpolation
Audio systems
delay systems
equalizers
phase distortion
psychoacoustics.

Access to Document

10.1109/ICASSP.2019.8682949

ELEC_Ramo_Graphic_Delay_Equalizer_ICASSPAccepted author manuscript, 1.21 MB

Cite this

Rämö, J., & Välimäki, V. (2019). Graphic Delay Equalizer. In 44th IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2019; Brighton; United Kingdom; 12-17 May 2019 : Proceedings (pp. 8018-8022). Article 8682949 (Proceedings of the IEEE International Conference on Acoustics, Speech, and Signal Processing). IEEE. https://doi.org/10.1109/ICASSP.2019.8682949

@inproceedings{674da20c5de24b3792a7e8ec688615ab,

title = "Graphic Delay Equalizer",

abstract = "A graphic delay equalizer based on a high-order nonparametric allpass filter design is proposed. Command points at the centers of octave frequency bands are connected with polynomial interpolation to form a continuous target group-delay curve as function of frequency. The required number of all-pass sections depends on the area under the target curve. The group-delay area at low audio frequencies is small due to the linear frequency scale, so only a few allpass sections can be assigned there, which reduces the accuracy. Design accuracy can be improved by adding a constant delay to the target curve, which increases the area. Two use cases are presented: the group-delay equalization of a multi-way loudspeaker and the linearization of the phase response of a regular magnitude-only graphic equalizer. The graphic delay equalizer can be used to enhance the perceptual quality of audio systems or to produce audio effects.",

keywords = "Delays, Equalizers, Graphics, Loudspeakers, Acoustics, Interpolation, Audio systems, delay systems, equalizers, phase distortion, psychoacoustics.",

author = "J. R{\"a}m{\"o} and V. V{\"a}lim{\"a}ki",

year = "2019",

month = may,

day = "1",

doi = "10.1109/ICASSP.2019.8682949",

language = "English",

isbn = "978-1-4799-8132-8",

series = "Proceedings of the IEEE International Conference on Acoustics, Speech, and Signal Processing",

publisher = "IEEE",

pages = "8018--8022",

booktitle = "44th IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2019; Brighton; United Kingdom; 12-17 May 2019 : Proceedings",

address = "United States",

note = "IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP ; Conference date: 12-05-2019 Through 17-05-2019",

}

Rämö, J & Välimäki, V 2019, Graphic Delay Equalizer. in 44th IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2019; Brighton; United Kingdom; 12-17 May 2019 : Proceedings., 8682949, Proceedings of the IEEE International Conference on Acoustics, Speech, and Signal Processing, IEEE, pp. 8018-8022, IEEE International Conference on Acoustics, Speech, and Signal Processing, Brighton, United Kingdom, 12/05/2019. https://doi.org/10.1109/ICASSP.2019.8682949

Graphic Delay Equalizer. / Rämö, J.; Välimäki, V.
44th IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2019; Brighton; United Kingdom; 12-17 May 2019 : Proceedings. IEEE, 2019. p. 8018-8022 8682949 (Proceedings of the IEEE International Conference on Acoustics, Speech, and Signal Processing).

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

TY - GEN

T1 - Graphic Delay Equalizer

AU - Rämö, J.

AU - Välimäki, V.

N1 - Conference code: 44

PY - 2019/5/1

Y1 - 2019/5/1

N2 - A graphic delay equalizer based on a high-order nonparametric allpass filter design is proposed. Command points at the centers of octave frequency bands are connected with polynomial interpolation to form a continuous target group-delay curve as function of frequency. The required number of all-pass sections depends on the area under the target curve. The group-delay area at low audio frequencies is small due to the linear frequency scale, so only a few allpass sections can be assigned there, which reduces the accuracy. Design accuracy can be improved by adding a constant delay to the target curve, which increases the area. Two use cases are presented: the group-delay equalization of a multi-way loudspeaker and the linearization of the phase response of a regular magnitude-only graphic equalizer. The graphic delay equalizer can be used to enhance the perceptual quality of audio systems or to produce audio effects.

AB - A graphic delay equalizer based on a high-order nonparametric allpass filter design is proposed. Command points at the centers of octave frequency bands are connected with polynomial interpolation to form a continuous target group-delay curve as function of frequency. The required number of all-pass sections depends on the area under the target curve. The group-delay area at low audio frequencies is small due to the linear frequency scale, so only a few allpass sections can be assigned there, which reduces the accuracy. Design accuracy can be improved by adding a constant delay to the target curve, which increases the area. Two use cases are presented: the group-delay equalization of a multi-way loudspeaker and the linearization of the phase response of a regular magnitude-only graphic equalizer. The graphic delay equalizer can be used to enhance the perceptual quality of audio systems or to produce audio effects.

KW - Delays

KW - Equalizers

KW - Graphics

KW - Loudspeakers

KW - Acoustics

KW - Interpolation

KW - Audio systems

KW - delay systems

KW - equalizers

KW - phase distortion

KW - psychoacoustics.

UR - http://www.scopus.com/inward/record.url?scp=85068971356&partnerID=8YFLogxK

U2 - 10.1109/ICASSP.2019.8682949

DO - 10.1109/ICASSP.2019.8682949

M3 - Conference article in proceedings

SN - 978-1-4799-8132-8

T3 - Proceedings of the IEEE International Conference on Acoustics, Speech, and Signal Processing

SP - 8018

EP - 8022

BT - 44th IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2019; Brighton; United Kingdom; 12-17 May 2019 : Proceedings

PB - IEEE

T2 - IEEE International Conference on Acoustics, Speech, and Signal Processing

Y2 - 12 May 2019 through 17 May 2019

ER -

Graphic Delay Equalizer

Abstract

Publication series

Conference

Keywords

Access to Document

Other files and links

Fingerprint

Aalto Acoustics Lab

Cite this

Graphic Delay Equalizer

Abstract

Publication series

Conference

Keywords

Access to Document

Other files and links

Fingerprint

Equipment

Aalto Acoustics Lab

Cite this