Hello Jungfeng, this is a good starting reference for human localisation in rooms:
https://asa.scitation.org/doi/abs/10.1121/1.390163?casa_token=CFvwSHcyaLAAAAAA:bWPPmgMCrq0av1HBq2u_qYarqXatOFggyofiiYVWzguTOLbI3jDLCG65xni64_uMXVKq7setdQ There are also two further papers by Hartmann on the same topic, which are linked at the beginning of the one linked above. In general, early reflections can reinforce the sense of localisation of the sound source, especially if coming from the same direction (see the conclusions of the paper above). Of course familiarity with the room (and/or long-term training) will be of help as well. Regarding the training, we actually do have a version of the app for iPhones and cardboard HMDs...if that's what you have, send me your github username/email address and I'll share the repo with you. Best Lorenzo -- Dr Lorenzo Picinali Reader in Audio Experience Design<https://www.axdesign.co.uk/> Dyson School of Design Engineering Imperial College London Dyson Building Imperial College Road South Kensington, SW7 2DB, London E: l.picin...@imperial.ac.uk http://www.imperial.ac.uk/people/l.picinali https://www.axdesign.co.uk/ ________________________________ From: Sursound <sursound-boun...@music.vt.edu> on behalf of Junfeng Li <junfeng.li.1...@gmail.com> Sent: 12 August 2022 11:16 To: Surround Sound discussion group <sursound@music.vt.edu> Subject: Re: [Sursound] On 3D audio rendering for signals with the low sampling frequency Dear Lorenzo, Thanks a lot for your instructive information. > addressing the same matter in the Auditory mailing list, David McAlpine > suggested to look at perceptual training: > > https://www.nature.com/articles/nn0998_417 > > While it is true that people with significant hearing loss above 8kHz can > still perceive elevation, it is likely that this hearing loss (e.g. > age-related sensorineural) appeared gradually, and the person had time to > adapt and re-map their spatial hearing cues. As mentioned by others > already, these are not just the peaks and notches typical of an HRTF, but > also the reflections coming from the surrounding space. > It is really interesting to know that elevation perception is also affected by the reflections. Is there any literature to report this conclusion? What are the differences of reflections for sound images with different elevated angles? > > The real issue with hearing training, specifically HRTF accommodation > (i.e. learning how to localise sound sources with an HRTF which is not your > own, which could be extended to learning how to localise sound sources > using an altered HRTF, e.g. low-passed at 8kHz), is that it takes some > time, it's not really immediate, so if the aim is to just release some > spatialised audio online or through other channels for the general public, > it might be difficult to implement that. > But it might be interesting to try! Together with Brian FG Katz in Paris > we've done some work looking at short- and long-term HRTF accommodation: > > https://www.nature.com/articles/s41598-018-37873-0 > > and also at VR-based localisation training > > https://www.nature.com/articles/s41598-019-54811-w > > We'll be happy to share with you our Unity (currently used with the Oculus > Quest 2) spatial hearing training application, so that you can try to > low-pass the output at 8kHz, and see whether it could work. > > > We have google Cardboard with a mobile phone as the display device. Is it suitable to use your Unity for spatial hearing training? If such, could you please let us have a try? Thanks a lot again. Best regards, Junfeng > > > > > > -- > Dr Lorenzo Picinali > Reader in Audio Experience Design<https://www.axdesign.co.uk/> > Dyson School of Design Engineering > Imperial College London > Dyson Building > Imperial College Road > South Kensington, SW7 2DB, London > E: l.picin...@imperial.ac.uk > > http://www.imperial.ac.uk/people/l.picinali > https://www.axdesign.co.uk/ > ________________________________ > From: Sursound <sursound-boun...@music.vt.edu> on behalf of Fons > Adriaensen <f...@linuxaudio.org> > Sent: 12 August 2022 08:48 > To: sursound@music.vt.edu <sursound@music.vt.edu> > Subject: Re: [Sursound] On 3D audio rendering for signals with the low > sampling frequency > > > ******************* > This email originates from outside Imperial. Do not click on links and > attachments unless you recognise the sender. > If you trust the sender, add them to your safe senders list > https://spam.ic.ac.uk/SpamConsole/Senders.aspx to disable email stamping > for this address. > ******************* > On Thu, Aug 11, 2022 at 06:40:28PM +0800, Junfeng Li wrote: > > > Do the early reflections contribute to elevation perception ? > > Well, something which is probably not related to HRTF does. > Older people often have hearing limited to 8 kHz or even less, > but may still be able to perceive elevation in some way. > > Early reflections (in a acoustically familiar environment) may > play a role. Also of course expectations - remember that human > perception is not objective, it is mostly based on a mental > reconstruction of a scene. We expect certain sounds to come > from above. Even cultural elements may play a role in how > certain sounds are perceived. > > This is very well known in visual perception - for example people > who have never lived in a world in which straight lines and right > angles are everywhere are not sensitive to some visual illusions > based on perspective. > > But what really puzzles me [1] is why a system that for whatever > reason is limited to an 8 kHz bandwidth is expected to provide > full 3D audio. It's just not realistic. You can't do a rock > concert with a one Watt amplifier. You can't transport a grand > piano on a bicycle. > > [1] Or not. I've known my share of managers who believe that > business logic or ideology can bend the laws of physics or > mathematics... > > Ciao, > > -- > FA > > _______________________________________________ > Sursound mailing list > Sursound@music.vt.edu > https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, > edit account or options, view archives and so on. > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > https://mail.music.vt.edu/mailman/private/sursound/attachments/20220812/f72781be/attachment.htm > > > _______________________________________________ > Sursound mailing list > Sursound@music.vt.edu > https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, > edit account or options, view archives and so on. > -------------- next part -------------- An HTML attachment was scrubbed... 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