filtering On 4 November 2017 at 18:23, Augustine Leudar <augustineleu...@gmail.com> wrote:
> sort of agree - front back reversals are always going to be an issue even > in real life - but you'll get something if the sound is louder in one ear > than the other on a recording - all I was saying is you definatley wont > get height without pinna > > > <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> > Virus-free. > www.avast.com > <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> > <#m_-1858828579946809614_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> > > On 4 November 2017 at 18:16, Stefan Schreiber <st...@mail.telepac.pt> > wrote: > >> Augustine Leudar wrote: >> >> Hi, >>> Yes for horizontal localisation you may get away with ILDs and ITDs - >>> >>> >> Is IMO not established psychoacoustical science... Front/back distinction >> (extreme case) etc. etc.? >> >> Stefan >> >> >> >> but >>> for height information the individual shape of the pinna is key and the >>> system of migrating frequency peaks and notches caused by the direction >>> dependant filterning caused by pinna shape . By filtering I mean the >>> frequency peaks and notches which change in accordance with height, a >>> filtering system that each individual brain has learnt, definitely work >>> better with individuslised HRTFs.... Interpoliation between HRTF data >>> sets >>> is one option but there are others...... >>> >>> On 4 November 2017 at 00:54, Ralph Glasgal <glas...@ambiophonics.org> >>> wrote: >>> >>> >>> >>>> It doesn't take a millionaire any longer. If you follow the rules of >>>> binaural psychoacoustics you don't need to measure any HRTFs to have a >>>> recording and loudspeaker reproduction system that delivers normal >>>> binaural >>>> hearing cues to any reasonable standard and does not make use of the >>>> stereophonic effect, or Ambisonic equations, but is a sort of >>>> home-friendly >>>> Wavefield Synthesis. Like WFS the listening area is much less >>>> restricted >>>> than that of a normal stereo system and since no HRTFs or head tracking >>>> is >>>> involved multiple listeners can be accommodated. >>>> >>>> The first rule is that in any such chain, there must be one head shadow >>>> but >>>> only one and it need not be the end listener's. By head shadow in this >>>> rule >>>> we are just considering ITD and ILD in the frequency range where these >>>> affect localization. Since we nod, rotate, and lean and sound goes >>>> over, >>>> under, around the front, around the rear, etc. the ITD and ILD are quite >>>> smeared and so the brain is used to this and can adjust to an ITD, ILD >>>> head >>>> shadow not its own. So it does not matter how the ITD and ILD are >>>> recorded >>>> or synthesized as long as they are normal values for a frontal or rear >>>> stage >>>> object and then are delivered unaltered to the ear canals. So no >>>> personalized HRTFs so far or head tracking. >>>> >>>> The second rule operates in the higher frequency range where it is only >>>> the >>>> pinnae that determine localization. The rule is that in any recording >>>> and >>>> reproduction chain there must be one and only one set of pinnae and that >>>> set >>>> must be that of the end listener. Since few mic arrays have pinnae, >>>> including the Soundfield, there is seldom a problem of having two sets >>>> of >>>> pinnae in a system. (can use most dummy head mics without the outer >>>> ears.) >>>> So the only problem in having the remaining part of a soundfield >>>> binaural, >>>> is in making sure that all the sound sources come to the ear from a >>>> direction that is pinnae proper. So for example central solo frontal >>>> sound >>>> should come from the central front. All reflections or direct sound >>>> coming >>>> from the rear should have directional components not only for the >>>> pinnae, >>>> but also be delivered with binaural ILD and ITD values that are not then >>>> allowed to be altered by the listener's head dimensions. >>>> >>>> It turns out that in the horizontal plain it is not too difficult to >>>> provide >>>> what the pinnae need in directionality without making any HF HRTF >>>> measurements. So I and my converts easily obtain solid full circle >>>> localization of direct sound in the horizontal plane from ordinary 4.0 >>>> recordings like SACDs, DTS 5.1, SQ, UHJ, Dolby Atmos, Auro 3d, etc. >>>> using >>>> just four speakers and only a modest amount of numerical processing. >>>> Direct >>>> elevated sound sources can be accommodated using similar rules but that >>>> needs more research and real music recordings to test with. Hall >>>> ambience >>>> height is easily accommodated as is all concert hall reverb, also in a >>>> binaural friendly way. >>>> >>>> The rules are different for headphones or earphones, however. Lots of >>>> AES >>>> and other papers on all this, including several on the Ambiophone 3D mic >>>> array that anyone can copy and use to make better 4.0 recordings of live >>>> sound. >>>> >>>> -----Original Message----- >>>> From: Sursound [mailto:sursound-boun...@music.vt.edu] On Behalf Of >>>> Augustine >>>> Leudar >>>> Sent: Friday, November 03, 2017 3:17 PM >>>> To: Surround Sound discussion group >>>> Subject: Re: [Sursound] 3D Browser disco >>>> >>>> great sound design but no cigar on the binaural front - thats really not >>>> going to get solved until a quick and convenient way of measuring >>>> HRTFs is >>>> designed - I have several in case any millionaires out there are >>>> interested >>>> .... >>>> >>>> On 3 November 2017 at 18:36, Ralph Glasgal <glas...@ambiophonics.org> >>>> wrote: >>>> >>>> >>>> >>>>> Have you tried https://cloud.aria3d.com Using a Chrome browser, >>>>> Christos Tsakostas, a Greek audio researcher produces an up to 180 >>>>> degrees wide stage in the horizontal plane starting with ordinary 5.1 >>>>> or 2.0 recordings and you can play your own UHJ's this way. There is >>>>> also no reason why this technique could not soon produce a full circle >>>>> of direct sound using just four speakers from 4.0/5.1 media including >>>>> Ambisonic media decoded to 4.0 which I have heard this way via DTS >>>>> media. >>>>> >>>>> >>>>> >>>> _______________________________________________ >>>> 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. >> > > > > -- > Dr. Augustine Leudar > Artistic Director Magik Door LTD > Company Number : NI635217 > Registered 63 Ballycoan rd, > Belfast BT88LL > > -- Dr. Augustine Leudar Artistic Director Magik Door LTD Company Number : NI635217 Registered 63 Ballycoan rd, Belfast BT88LL -------------- next part -------------- An HTML attachment was scrubbed... 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