Virtual Analog Simulation and Extensions of Plate Reverberation
Author
Willemsen, Silvin
Term
4. Term
Education
Publication year
2017
Submitted on
2017-05-22
Pages
100
Abstract
In the 1950s-60s, steel plates were used to create reverberation, but the hardware is bulky and maintenance-heavy. This thesis investigates a virtual analog (VA) simulation of plate reverberation that reproduces the classic character while enabling new interactions. Building on thin-plate physics (Kirchhoff-Love theory), dispersion, damping, and boundary conditions, several implementation strategies are reviewed (convolution, feedback delay networks, finite-difference schemes, and modal descriptions), after which a modal approach is selected. Eigenfrequencies, excitation/observation vectors, and loss coefficients are derived, and extensions are developed that allow the input/output positions and the plate's dimensions to be changed in real time. The model is implemented and optimized as a real-time plugin. Moving the output positions produces a distinctive flanging effect, and resizing the plate yields a pitch-bend-like effect - capabilities reported as absent from current plugins. A listening test and questionnaire indicate the sound is perceived as enjoyable (4/5).
Staalplader blev i 1950'erne og 60'erne brugt til at skabe rumklang, men de fysiske enheder er store og vedligeholdelseskraevende. Denne afhandling undersoeger, hvordan pladereverberation kan simuleres som en virtuel analog (VA) model, der baade efterligner den klassiske lyd og muliggor nye interaktioner. Ud fra tyndpladeteori (Kirchhoff-Love), dispersion, daempning og randbetingelser sammenlignes implementeringsmetoder (konvolution, feedback-forsinkelsesnetvaerk, finit-differens og modal beskrivelse), hvorefter en modal tilgang vaelges. Der udledes egenfrekvenser, ind- og udgangsvektorer samt tabskoefficienter, og der udvikles udvidelser, hvor ind-/udgangspositioner og selve pladens dimensioner kan aendres i realtid. Modellen implementeres som et realtids-plugin og optimeres beregningsmaessigt. Naar udgangspositionerne flyttes, opstar en karakteristisk flanger-effekt, og naar pladens stoerrelse aendres, faas en pitch-bend-lignende effekt - funktioner, der ifolge gennemgangen ikke findes i eksisterende plugins. En lyttetest og spoergeskema indikerer, at lydkvaliteten opleves som behagelig (4/5).
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