You may have problems with early reflections and the focussing effect of this big concave surface around the head - if so, these problems might well be "internalisation" effects similar to what Ralph describes when you talk/whistle whilst cupping the ear with your hand...?
Dr Peter Lennox School of Technology University of Derby, UK tel: 01332 593155 e: p.len...@derby.ac.uk -----Original Message----- From: sursound-boun...@music.vt.edu [mailto:sursound-boun...@music.vt.edu] On Behalf Of umashankar mantravadi Sent: 25 May 2011 15:13 To: rglas...@yahoo.com; sursound@music.vt.edu Subject: Re: [Sursound] Sound Externalization Headphone some months ago i acquired a battered motor cycle helmet. the aim is to mount eight loudspeakers ; remove the foam but leave the helmet suspension intact, so it is a few inches off the head in all directions. feed a standard cube decode. havent tried it yet. distracted by a loudspeaker cube! umashankar i have published my poems. read (or buy) at http://stores.lulu.com/umashankar > Date: Wed, 25 May 2011 07:09:14 -0700 > From: rglas...@yahoo.com > To: sursound@music.vt.edu > Subject: Re: [Sursound] Sound Externalization Headphone > > As in most things there are first order effects and second order effects. > > Although there seems to be little in the literature, the basic cause of > internalization seems clearly to be interference with the pinna. You can > test this for yourself by whistling and bringing your hands up to your ears. > The whistle will for most people move inside their head. Thus since most > earphones, interfere with the pinna internalization results. Etymotic > earphones don't work because then there are no pinna. On can imagine that a > brain that suddenly cannot receive any pinna directional finding patterns (or > any normal ones) makes the only logical assumption possible that the sound > originates inside the skull. > > The old IMAX helmut for 3D solved this problem (and the stereo crosstalk one) > by using ear speakers. Their demo for an AES convention was very convincing. > Another problem with earphone listening is that the stage is sort of always > frontal, but you can get great proximity (depth) effects. The rear or > overhead part, in the absence of normal Pinna function, is almost impossible > to achieve unless your standards or expectations are low. You may get it to > work for one listener or earphone type but not universally. > > Tricks like head tracking, HRTF diddling, etc. are second order fixes or mild > palliatives. Pinna are like fingerprints and it is likely impossible to find > a universal solution to internalization that is practical. If you measure > your own pinna and then use this IR with eytmotic earphones you should get a > reasonable result, but in practice this is difficult and even unpleasant. > This is why the loudspeaker binaural technologies are still attractive and > why there are hundreds of PC and iPod docking stations advertised. > > By the way the iPad app for Ambiophonics is free thanks to Steve Hotto. > > Ralph Glasgal > glas...@ambiophonics.org > www.ambiophonics.org > > From: Junfeng Li <junfeng.li.1...@gmail.com> > To: Surround Sound discussion group <sursound@music.vt.edu> > Sent: Tuesday, May 24, 2011 3:49 AM > Subject: [Sursound] Sound Externalization Headphone > > Dear List, > > I am now researching on 3D audio playback/rendering in headphone. One > purpose of this work is to playback the 5.1 Audio using headphone. > One main problem for sound playback using headphone is "in-head > localization". Therefore to playback the 5.1 audio with headphone, I am now > trying to externalize sound in headphone playback. > > Is anyone able to give me some comments/suggestion on this issue? > > Thank you so much in advance. > > Best regards, > Junfeng > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <https://mail.music.vt.edu/mailman/private/sursound/attachments/20110524/e5c01522/attachment.html> > _______________________________________________ > 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/20110525/51e94c4f/attachment.html> > _______________________________________________ > Sursound mailing list > Sursound@music.vt.edu > https://mail.music.vt.edu/mailman/listinfo/sursound -------------- next part -------------- An HTML attachment was scrubbed... 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