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Impulse response upmixing using particle systems
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| Even with current audio technology, many sound design tasks present practical constraints in terms of layering sounds, creating sound variations, fragmenting sound and ensuring space distribution, especially when trying to handle highly complex scenarios with a significant number of audio sources. This paper presents the use of particles systems and virtual microphones, as a new approach to sound design, allowing the mixing of thousands or even millions of sound sources, without requiring laborious work and providing a true coherence between sound and space, with support for several surround formats, Ambisonics, Binaural, and even partial Dolby Atmos support. By controlling a particle system, instead of individual sound sources, a high number of sounds can be easily spread over a virtual space. By adding movement or random audio effects, even complex scenarios can be created. | 564.82 KB | Adobe PDF |
Authors
Advisor(s)
Abstract(s)
With the increase of the computational power of DSP's and CPU's, impulse responses (IR) and the convolution process are becoming a very popular approach to recreate some audio effects like reverb. But although many IR repositories exist, most IR consider only mono or stereo. This paper presents an approach for impulse response upmixing using particle systems. Using a reverse engineering process, a particle system is created, capable of reproducing the original impulse response. By re-rendering the obtained particle system with virtual microphones, an upmixing result can be obtained. Depending on the type of virtual microphone, several different output formats can be supported, ranging from stereo to surround, and including binaural support, Ambisonics or even custom speaker scenarios (VBAP).
Description
Keywords
Microphones Reverse engineering A-particles Ambisonics Audio effects Computational power Output formats Particle systems Reverse engineering process Virtual microphone Impulse response
Pedagogical Context
Citation
Fonseca, Nuno; 2014; Impulse Response Upmixing Using Particle Systems [PDF]; ESTG/CIIC, Polytechnic Institute of Leiria, Leiria, Portugal; Paper 9100; Available from: https://aes2.org/publications/elibrary-page/?id=17423.
Publisher
Audio Engineering Society
CC License
Without CC licence