Room Reverberation Simulation using Parametrised Feedback Delay Networks
Translated title
Simulering af rumklang ved brug af parametrised Feedback Delay Networks
Author
Term
4. Term
Education
Publication year
2020
Submitted on
2020-06-04
Pages
50
Abstract
Rumklangsyntese beskriver filterstrukturer som tilnærmer rumklang. Med forskellige akustiske egenskaber og parameter som freqkvensabsorption, efterklangstid og rumstørrelse, disse structurer emulerer refleksioner og diffuse dele af rummets impulssvar. Denne report beskriver en real-time implementation af et rumklangssystem som bruger delay elementer og allpass filter for refleksioner og en feedback delay network for den diffuse del af impulssvaret. Systemets signal er sammenlignet med to andre rumklangssystemer. Resultaterne viser en stor forskel mellem systemernes impulssvarer med mindre correlation. Lydtests som bruger rumklangssystemer i forbindelsen med Unity® viser at der er lille perceptuel forskel mellem rumklangssystemer. For fremtidige forbedringer, det anbefales at bruge andre lydtestbetingelser og en sammenligning med andre, mere passende rumklangssystemer
Artificial reverberation synthesis describes filter structures that approximate room reverberation. Given a set of acoustic phenomena and parameters such as frequency absorption, reverberation time and room size, these reverberator structures emulate the given effects for early reflections and the diffuse reverberation tail. In this report, a real-time implementation of a reverberator structure is described, using delay lines and allpass filters for early reflections and a feedback delay network topology for the late reverberation tail. The output of the reverberator structure is compared against two commercially available reverberators. The results show a vast numerical difference in the system's impulse responses. Listening tests using the reverb signals in conjunction with the Unity® engine reveal that there is little perceptual difference across the reverberators. For future improvements, different test conditions and comparisons with more suitable frameworks are suggested.
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