# Sound Propagation With Adaptive Impulse Responses | Two Minute Papers #95 ## Метаданные - **Канал:** Two Minute Papers - **YouTube:** https://www.youtube.com/watch?v=Mx8viOFKiIs - **Дата:** 19.09.2016 - **Длительность:** 4:01 - **Просмотры:** 6,306 ## Описание A realistic simulation of sounds within virtual environments dramatically improves the immersion of the user in computer games and virtual reality applications. To be able to simulate these effects, we need to compute the interaction between sound waves and the geometry and materials within the scene. Let's see how this work accomplishes it! ______________________________ The paper "Adaptive Impulse Response Modeling for Interactive Sound Propagation" is available here: http://gamma.cs.unc.edu/ADAPTIVEIR/ Recommended for you: Rocking Out With Convolutions - https://www.youtube.com/watch?v=JKYQOAZRZu4 All light-transport related episodes: https://www.youtube.com/playlist?list=PLujxSBD-JXgk1hb8lyu6sTYsLL39r_3bG WE WOULD LIKE TO THANK OUR GENEROUS PATREON SUPPORTERS WHO MAKE TWO MINUTE PAPERS POSSIBLE: Sunil Kim, Julian Josephs, Daniel John Benton, Dave Rushton-Smith, Benjamin Kang. https://www.patreon.com/TwoMinutePapers We also thank Experiment for sponsoring our series. - https://experiment.com/ Subscribe if you would like to see more of these! - http://www.youtube.com/subscription_center?add_user=keeroyz Music: Dat Groove by Audionautix is licensed under a Creative Commons Attribution license (https://creativecommons.org/licenses/by/4.0/) Artist: http://audionautix.com/ The thumbnail background image was created by Robert - https://flic.kr/p/9YViuT Splash screen/thumbnail design: Felícia Fehér - http://felicia.hu Károly Zsolnai-Fehér's links: Facebook → https://www.facebook.com/TwoMinutePapers/ Twitter → https://twitter.com/karoly_zsolnai Web → https://cg.tuwien.ac.at/~zsolnai/ ## Содержание ### [0:00](https://www.youtube.com/watch?v=Mx8viOFKiIs) dear fellow Scholars this is 2minute papers with car have you ever wondered how your voice or your guitar would sound in the middle of a space station a realistic simulation of sounds within virtual environments dramatically improves the immersion of the user in computer games and virtual reality applications to be able to simulate these effects we need to compute the interaction between sound waves and the geometry and materials within the scene if you remember we also had quite a few episodes about light simulations where we simulated the interaction of light rays or waves and the scene we have at hand sounds quite similar right well kind of and the great thing is that we can reuse quite a bit of this knowledge and some of the equations for light transport for sound ### [0:52](https://www.youtube.com/watch?v=Mx8viOFKiIs&t=52s) Path Tracing this technique we call past tracing and it is one of the many well-known techniques used for sound simulation we can use past tracing to simulate the path of many waves to obtain an Impulse response which is a simple mathematical function that describes the reverberation that we hear if we shoot a gun in a given scene such as a space station or a church after we obtain these impulse responses we can use an operation called the convolution with our input signal like our voice to get a really convincing result we have talked about this in more detail in earlier episodes I've put a link for them in the video description box it is important to note that the impulse response depends on the scene and where we the listeners are exactly in the scene in pretty much every concert ever we find that sound reverberations are quite different in the middle of the Arena versus standing at the back one of the main contributions of this work is that it ### [1:52](https://www.youtube.com/watch?v=Mx8viOFKiIs&t=112s) Temporal Coherence exploits temporal coherence this means that even though the impulse response is different if we stand at different places but these locations don't change arbitrarily and we can reuse a lot of information from the previous few impulse responses that we worked so hard to compute this way we can get away with tracing much fewer rays and still get high quality results in the best cases the algorithm executes five times as quickly as previous techniques and the memory requirements are significantly more favorable the paper also contains a ### [2:26](https://www.youtube.com/watch?v=Mx8viOFKiIs&t=146s) User Study Limitations user study limitations include a bit overly smoth smooth audio signals and some Fidelity loss in the lower frequency domains some of these scenes in the footage showcase up to 24 distinct sound sources and all of them are simulated against the geometry and the materials found in the scene so let's listen together and Delight in these magnificent results this small room has a short reverberation time notice how the Reverb quality changes as a listener exits the into a larger area we pry large associated with the thanks for watching and for your generous support and I'll see you next time oh --- *Источник: https://ekstraktznaniy.ru/video/14772*