Late-Reverberation Synthesis using Interleaved Velvet-Noise Sequences
| Autor: | Karolina Prawda, Vesa Välimäki |
|---|---|
| Přispěvatelé: | Audio Signal Processing, Dept Signal Process and Acoust, Aalto-yliopisto, Aalto University |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Reverberation
Acoustics and Ultrasonics Computer science digital signal processing White noise Signal Finite impulse response filters Computer Science (miscellaneous) filtering algorithms Electrical and Electronic Engineering Delays acoustics Digital signal processing Impulse response business.industry Delay lines Filter (signal processing) Speech processing Computational Mathematics Noise Computer Science::Sound business Signal processing algorithms Algorithm Audio systems |
| Popis: | Lataa oa-artikkeli, kun julkaistu This paper proposes a novel algorithm for simulating the late part of room reverberation. A well-known fact is that a room impulse response sounds similar to exponentially decaying filtered noise some time after the beginning. The algorithm proposed here employs several velvet-noise sequences in parallel and combines them so that their non-zero samples never occur at the same time. Each velvet-noise sequence is driven by the same input signal but is filtered with its own feedback filter which has the same delay-line length as the velvet-noise sequence. The resulting response is sparse and consists of filtered noise that decays approximately exponentially with a given frequency-dependent reverberation time profile. We show via a formal listening test that four interleaved branches are sufficient to produce a smooth high-quality response. The outputs of the branches connected in different combinations produce decorrelated output signals for multichannel reproduction. The proposed method is compared with a state-of-the-art delay-based reverberation method and its advantages are pointed out. The computational load of the method is 60% smaller than that of a comparable existing method, the feedback delay network. The proposed method is well suited to the synthesis of diffuse late reverberation in audio and music production. |
| Databáze: | OpenAIRE |
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