Thanks Hannes I'll give that a read. Im beginning to feel that like stereo it's probably best to reference on a wide range of headphones, from the super accurate phase coherant, to the apple earbuds 80% will listen on as a reference.
On Tuesday, 23 June 2020, Hannes Helmholz <hannes.helmh...@chalmers.se> wrote: > I found this paper quite a while ago [1]. I suppose it tries to answer > exactly the question you have. > > However, I find it difficult to judge whether the employed way of > simulating different sets of headphones via impulse responses is really > "transparent" there. > Even if done to the best of technical ability, I doubt that the > simulation can provide an accurate representation of another headphones' > ear signals in the subjects ears (also since HRTFs an HRIRs of a dummy > head were used). On a perceptual level however, they state that the > simulation works okay by referencing former studies. > > As other people also mentioned, occlusion (according to open / closed > back headphones / earbuds) has a big influence on perceived attributes > of binaural reproduction. This is one point which I think is very > difficult or even impossible to simulate without actually employing the > individual headsets (I imagine it requires extensive technical effort > and even more individual tuning for each subject). > > However, learning about the influence of different (low cost) headphone > magnitude spectra is of course valuable. :) > > [1] P. Gutierrez-Parera and J. J. Lopez, “Influence of the quality of > Consumer Headphones in the Perception of Spatial Audio,” Appl. Sci., > vol. 6, no. 5, pp. 1–18, 2016, doi: 10.3390/app6040117. > https://www.mdpi.com/2076-3417/6/4/117/pdf > > Best, > /Hannes > > On 2020-06-23 22:23, Augustine Leudar wrote: > > "The argument that open headphones would add a second 'pinna response' > > to a binaural signal doesn't hold. The whole point of the pinnae is > > that the response depends on direction, and with headphones that > > is not the case. " > > > > Well except the headphones do have a direction if they are outside your > > Pinnae - in the case of my HD6000s the driver is about 2 cm outside my > > pinnae in the middle of my ear so they would have whatever the HRTF is > for > > being close to / next to your ear, in the same way, I guess a mosquito > has > > when it flies close to your ear can be localised as it flies past the > same > > position, admittedly that is a moving object unlike headphones ... it > would > > interesting to see if there are any papers/listening tests which have > > tested lovcalisation with HRTFs and different types of headphones - are > > there any ? > > > > On Sat, 20 Jun 2020 at 09:26, Fons Adriaensen <f...@linuxaudio.org> > wrote: > > > >> On Fri, Jun 19, 2020 at 11:12:38PM +0100, Augustine Leudar wrote: > >> > >>> I normally do installation work but lockdown has steered me towards > >> working > >>> on binaural work that can be streamed. Obviously, with speakers, I > have a > >>> calibrated system, room treatment etc > >> > >>> I have a pair of Sennheiser HD600s > >>> that I use but it occurs to me that these kinds of over-ear headphones > >> may > >>> not be best suited for binaural work as there may be some pinna > filtering > >>> seeing as the driver is as large as my pinna, so I was thinking earbuds > >>> might be more suitable as they bypass the pinna altogether and you are > >> just > >>> left with the HRTFs > >> > >> In may experience binaural works best with open headphones. Earbuds have > >> a very strong occlusion effect, and there is experimental evidence that > >> this prevents externalisation. > >> > >> Occlusion means that the acoustic impedance as seen by the ear is > changed > >> by being in a closed volume. It's why you hear your own voice much > stronger > >> when you close the ear canal. > >> > >> It is possible to remove occlusion even with closed headphones, but this > >> requires active systems. Noise cancellation using feedback from within > >> the headphone will do this to some degree as a side effect. Feedforward > >> systems don't. This is an area of active research (in which I'm > involved). > >> > >> That said, there's a lot of difference in binaural performance even > >> among high quality open headphones. One factor that seems to have an > >> influence is how well the phase/delay response is matched between the > >> two sides. For some headphones this is intentionally 'randomised', > >> some people seem to prefer that for normal (non-binaural) listening. > >> It's quite simple to test: listen to a mono signal. If the responses > >> are well matched you should get a solid image dead center. If not, > >> even a mono signal will be somewhat 'diffuse'. This is called the > >> 'Tonmeister test' in some circles :-) > >> > >> The argument that open headphones would add a second 'pinna response' > >> to a binaural signal doesn't hold. The whole point of the pinnae is > >> that the response depends on direction, and with headphones that > >> is not the case. What remains is a fixed effect that can be removed > >> by normal equalisation or as part of the design. > >> > >> 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. > >> > > > > > > -- Artist website: www.augustineleudar.com Business website: www.magikdoor.net +44(0)7555784775 -------------- next part -------------- An HTML attachment was scrubbed... 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