A Low-Latency Quasi-Linear-Phase Octave Graphic Equalizer

Valeria Bruschi, Vesa Välimäki, Juho Liski, Stefania Cecchi

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

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This paper proposes a low-latency quasi-linear-phase octave graphic equalizer. The structure is derived from a recent linear-phase graphic equalizer based on interpolated finite impulse response (IFIR) filters. The proposed system reduces the total latency of the previous equalizer by implementing a hybrid structure. An infinite impulse response (IIR) shelving filter is used in the structure to implement the first band of the equalizer, whereas the rest of the band filters are realized with the linear-phase FIR structure. The introduction of the IIR filter causes a nonlinear phase response in the low frequencies, but the total latency is reduced by 50% in comparison to the linear-phase equalizer. The proposed graphic equalizer is useful in real-time audio processing, where only little latency is tolerated.
Original languageEnglish
Title of host publicationProceedings of the 25th International Conference on Digital Audio Effects (DAFx20in22)
EditorsGianpaolo Evangelista, Nicki Holighaus
Place of PublicationVienna, Austria
Number of pages7
ISBN (Print)978-3-200-08599-2
Publication statusPublished - 6 Sept 2022
MoE publication typeA4 Conference publication
EventInternational Conference on Digital Audio Effects - University of Music and Performing Arts Vienna, Vienna, Austria
Duration: 7 Sept 20229 Sept 2022
Conference number: 25

Publication series

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


ConferenceInternational Conference on Digital Audio Effects
Abbreviated titleDAFx
Internet address


  • Audio signal processing
  • Digital signal processing
  • equalization
  • filter design


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  • Valeria Bruschi

    Vesa Välimäki (Host) & Juho Liski (Host)

    13 Sept 202117 Dec 2021

    Activity: Hosting a visitor typesHosting an academic visitor

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