Implementation Of A Hybrid Reverb Algorithm: Parameterizing Synthetic Late Reverberation From Impulse Responses
Translated title
Implementation Of A Hybrid Reverb Algorithm: Parameterisering af syntetisk efterklang fra impuls Svar
Author
Steimel, Maximilian Peter Robert
Term
4. Term
Education
Publication year
2019
Pages
78
Abstract
Efterklang er den naturlige hale af lyd, der bliver tilbage, når lyd reflekteres i et rum. Denne afhandling undersøger en hybrid måde at skabe kunstig efterklang på ved at kombinere to veletablerede teknikker. Konvolutions-efterklang bruger optagede rumimpulsresponser til at genskabe de karakteristiske tidlige refleksioner. Et syntetisk filternetværk genererer derefter den diffuse sene efterklang. I vores implementering bliver den syntetiske del indstillet ud fra målte rumimpulsresponser ved hjælp af Energy Decay Relief (EDR)-analyse, som beskriver, hvordan lydenergi aftager over tid, og mindste kvadraters optimering, en standardmetode til tilpasning. Systemet blev evalueret ved at sammenligne signaler, gennemføre en lytteprøve og anvende en objektiv vurdering af oplevet lydkvalitet. Målet var at se, om dette moderne hybride design overgår en enklere hybrid reference. Resultaterne viser kun en lille fordel for den foreslåede implementering. Selvom forbedringen er marginal, tydeliggør studiet, hvordan moderne parameterisering kan anvendes i hybride efterklange, og lægger grundlaget for fremtidigt arbejde og alternative design.
Reverberation is the natural tail that lingers after a sound as it reflects around a room. This thesis explores a hybrid way to create artificial reverberation by combining two established techniques. Convolution reverb uses recorded room impulse responses to reproduce the characteristic early reflections, while a synthetic filter network generates the diffuse late reverberation. In our implementation, the synthetic part is tuned from measured room impulse responses using Energy Decay Relief (EDR) analysis, which describes how sound energy decays over time, and Least Squares optimization, a standard method for curve fitting. We evaluated the system by comparing output signals, running a listening test, and applying an objective assessment of perceived audio quality. The aim was to determine whether this state-of-the-art hybrid design outperforms a simpler hybrid baseline. The results show only a small advantage for the proposed implementation. Although the improvement is marginal, the study clarifies how modern parameterization can be applied in hybrid reverbs and provides a foundation for future work and alternative designs.
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