A master thesis from Aalborg University
Implementation Of A Hybrid Reverb Algorithm: Parameterizing Synthetic Late Reverberation From Impulse Responses
[Implementation Of A Hybrid Reverb Algorithm: Parameterisering af syntetisk efterklang fra impuls Svar]
Author(s)
Term
4. Term
Education
Publication year
2019
Submitted on
2019-08-15
Pages
78 pages
Abstract
Hybrid Reverb beskriver kombinationen af konvolutions-reverb og en syntetisk reverb-struktur for at skabe kunstig efterklang. Denne rapport beskriver nylige metoder i feltet. En implementering af en hybrid reverberator er beskrevet ved anvendelse af avancerede metoder ved at kombinere konvolutions-reverb til modellering af tidlige refleksioner og en filterstruktur til syntetisk senklang, hvis koefficienter er parametriseret fra rumimpulsresponser ved hjælp af Energy Decay Relief-analyse og Mindstekvadratoptimering. \ Newline Implementeringen evalueres gennem signal sammenligning, en subjektiv lytningstest og en objektiv vurdering af den opfattede lydkvalitet. Målet med evalueringen var at finde ud af, om den implementerede metode klarer sig bedre end en mere rudimentær hybrid efterklangsmetode. Resultaterne viser kun en marginal forskel til fordel for implementeringen, mens de lægger grundlaget for fremtidig arbejde og mulige alternativer til den undersøgte struktur.
Hybrid Reverb describes the combination of convolution reverb and a synthetic reverb structure to create artificial reverberation. This report describes recent methods in the field. An implementation of a hybrid reverberator is described, using state-of-the-art methods by combining convolution reverb for modelling early reflections and a filter structure for synthetic late reverb, whose coefficients are parameterized from room impulse responses, using Energy Decay Relief analysis and Least Squares optimization.\newline The implementation is evaluated through signal comparison, a subjective listening test, and an objective evaluation of perceived audio quality. The goal of the evaluation was to find out if the implemented method performs better than a more rudimentary hybrid reverberation method. The results show only a marginal difference in favor for the implementation, while laying the foundation for future work and possible alternatives to the investigated structure.
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