Two-Stage Attenuation Filter for Artificial Reverberation

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2024-01-10
Major/Subject
Mcode
Degree programme
Language
en
Pages
5
1-5
Series
IEEE Signal Processing Letters, Volume 31
Abstract
Delay networks are a common parametric method to synthesize the late part of the room reverberation. A delay network consists of several feedback loops, each containing a delay line and an attenuation filter, which approximates the same decay rate by appropriately setting the frequency-dependent loop gain. A remaining challenge is the design of the attenuation filters on a wide frequency range based on a measured room impulse response. This letter proposes a novel two-stage attenuation filter structure, sharpening the design. The first stage is a low-order pre-filter approximating the overall shape and determining the decay at the two ends of the frequency range, namely at the dc and the Nyquist limit. The second filter, an equalizer, fine-tunes the gain at different frequencies, such as on one-third-octave bands. It is shown that the proposed design is more accurate and robust than previous methods. A design example applying the proposed method to an interleaved velvet-noise reverberator is also exhibited. The proposed two-stage attenuation filter is a step toward a realistic parametric simulation of measured room impulse responses.
Description
Publisher Copyright: IEEE
Keywords
Acoustic signal processing, Attenuation, audio systems, Band-pass filters, Delay lines, Delays, digital filters, equalizers, Gain, IIR filters, Reverberation, room acoustics
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Citation
Valimaki , V , Prawda , K & Schlecht , S J 2024 , ' Two-Stage Attenuation Filter for Artificial Reverberation ' , IEEE Signal Processing Letters , vol. 31 , pp. 391-395 . https://doi.org/10.1109/LSP.2024.3352510