Dear Archontis,
On Tue, May 24, 2011 at 11:09 PM, Archontis Politis <deadflagb...@gmail.com>wrote: > Hi, > > I would add to Jörn's comments that apart from head-tracking, which is > crucial, you probably have to apply some decorrelation to your synthetic > binaural signals, and mix them with the normal ones. From anechoic hrtfs > only, especially if they are generic ones it is easy to get the in-head > effect. You can add decorrelation by some room simulation algorithm, > artificial reverberation or simpler by convolving your signals with bursts > of noise, passing them through allpass filters, applying varying delays, > whatever you can do that will scramble the phase but not the magnitude of > the sounds. > Thanks a lot. In fact, I tried to add some reverberation in the synthetic binaural signals. The resultant signals really seems to move to out of head to a certain degree. Now, I am now wondering whether the rendering should much more realistic if both adding reverberation and head tracking are integrated. > > I have heard demonstrations with room simulated binaural responses that > were well externalised without head-tracking, adding head-tracking should be > very effective. You can check the literature for audio decorrelation > techniques or artificial reverberation. Have a look also on the following > master thesis: > > Headphone Sound Externalization - TKK Acoustics > www.acoustics.hut.fi/publications/files/theses/liitola_mst.pdf > Thanks a lot for this detail information. Best regards, Junfeng > > Regards, > Archontis > > > On 5/24/11 5:31 PM, Jörn Nettingsmeier wrote: > >> On 05/24/2011 03:42 PM, Junfeng Li wrote: >> >>> Dear Daniel, >>> >>> Thanks a lot. >>> >>> I have already read some information on Dolby and Smyth surround >>> headphones. >>> >>> However, what I could see on these headphones is only the introduction of >>> the products. >>> What I now need is some technical/scientific documents/articles to >>> explain >>> the principle and implementation of these products. >>> Could you provide some references on it? >>> >>> Thank you very much. >>> >> >> well, if you have headphones, you have to be doing binaural synthesis. >> >> so what happens is you take the positions of the speakers you want to >> simulate, and convolve each speaker signal with the appropriate head-related >> transfer functions for the left and right ear. >> >> the next step (and a pretty important one) is to track the user's head >> movements, and at the same time crossfade to another set of HRTFs. that's >> not exactly trivial, but also quite well understood, and there are some free >> implementations that do the job pretty well. >> >> that's pretty much all there is to it. >> >> in theory :) >> >> what makes it a product is to figure out how to >> a) either measure the customer's own HRTFs without annoying them too much >> (because you want quite a lot of them), or >> b) provide some means to select and optimize a generic set of HRTFs. >> >> iiuc, smyth is doing a). >> >> >> >> > _______________________________________________ > Sursound mailing list > Sursound@music.vt.edu > https://mail.music.vt.edu/mailman/listinfo/sursound > -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://mail.music.vt.edu/mailman/private/sursound/attachments/20110525/aa375c4d/attachment.html> _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
