> So how could it be falsified? Tell me? At least as far as all of the linear > acoustics happening around the head, and pinna, and shoulders, and the ear > canal, go, it's a tautology that a full set of HRTF's captures it all.
I want to comment on this, I suspect that with HRTF's measuring / mathematical use for replay we have taken a wrong path in to an engineering / measurement over achievement because it is possible. Not because it is needed, and even when we measure and use the results we probably are choosing to ignore factors that can a have large impact? My postulate is that we hear with our brain the same way that we see with our brain not with our sensors that do NOT work equivalent to microphones and cameras. In addition when we listen naturally, the brain is aware of our body position and the ears position in relation to for example our shoulders and the local physical surroundings and their expected acoustic impact. My brain have 60+ years of learning to decode my environment through senses with input as body posture, skin sensitivity for temperature, wind, humidity, smell, sound and vision. I want to list a few aspects that I think points to our brains individual flexibility to adapt and adjust to our changing sensor calibration. - Sight - we have automatic white balance and sensitivity adjustment. Examples: Sunglasses Changing light color temperature during the day, inside and outside lighting. -Hearing - we have automatic directivity sensitivity adjustment, compensation for body posture like shoulder height and body/shoulders turned in relation to head and other external acoustic factors that our other senses can assist in adjusting the sound decoding brain process ... Examples: going in to different sized rooms, different floor materials, outdoors in soft snow, woods or fields... Putting on a hat, cap, glasses, jacket with large raised fur coated collar or other large change of head and body shape impacting the theoretically complete and perfect base hrtf's. So maybe we should use basic parametric controlled hrtf's and introduce more input for real time adjustments of parameters? - we can now do low cost directional tracking of the head. - should we also add adjustment for the relative shoulder positions to the ear channels. Head tracking is known to assist in externalizing of the experienced sound environment when listing via head phones ( or in-ear or ear covering). We cannot really remember a sound waveform, we can remember the decoded and interpreted result that the brain presented to the part of the brain we call I or Me :-). Maybe this is enough for today... Best Regards Bo-Erik Sandholm Stockholm -----Original Message----- From: Sursound [mailto:sursound-boun...@music.vt.edu] On Behalf Of Sampo Syreeni Sent: den 26 november 2014 04:36 To: Surround Sound discussion group Subject: Re: [Sursound] Oculus Rift Visual Demo + Ambisonic Audio Available? On 2014-11-19, dw wrote: > There are numerous examples where the predictions of HRTF localisation > are falsified by observations. What is one to think of the science? So now you'd need to define what you mean by HRTF's. I at least think it means "the full, static, anechoic impulse response from a certain source to your brain". I.e. my idea of what an HRTF is, is the full, optimal, linearly and time-invariantly modelable subset in L^2 norm, of any and all phenomena in both time and space/angle, which our too ears appear to be able to hear. So how could it be falsified? Tell me? At least as far as all of the linear acoustics happening around the head, and pinna, and shoulders, and the ear canal, go, it's a tautology that a full set of HRTF's captures it all. So what are you talking about, really? Something else than linear acoustics governed by the usual wave equation, for sure. But what precisely? I'd really want to hear. -- Sampo Syreeni, aka decoy - de...@iki.fi, http://decoy.iki.fi/front +358-40-3255353, 025E D175 ABE5 027C 9494 EEB0 E090 8BA9 0509 85C2 _______________________________________________ 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. _______________________________________________ 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.
