Thanx Marc for the pointer. Having a quick look, it seems that tinting is what I call sound-feld shaping, and also what Kronlachner has included in his ambisonic plugins as “directional loudness”. Essentially it describes the application of an arbitrary directional weighting to the sound-field before decoding, so that for example certain angular regions can be attenuated or modified compared to others. I have also used it for acoustic analysis purposes, to analyze what’s happening (sources/reflections) only on a certain angular region. The operations to do that arise naturally in the SH theory.
Richard in his patent seems to be applying the HRTFs as spatial weighting to the sound-field, in order to enhance various cues including elevation, a smart idea! Note that this is different from a direct ambisonic to binaural conversion, in which you take the HOA signals and you end up with two binaural signals, here you take the HOA signals, you weight the sound-field with the HRTFs, and you end up with 2 times the HOA signals, HRTF-weighted, one set for each ear. These can then be used for an enhanced ambisonic to binaural conversion. I too fail to see though what this has to do with the OP headphones with the 4 drivers inside… Regards, Archontis > On 24 Feb 2016, at 19:58, Marc Lavallee <m...@hacklava.net> wrote: > > On Wed, 24 Feb 2016 14:27:36 +0000 > Politis Archontis <archontis.poli...@aalto.fi> wrote: > >>> On 24 Feb 2016, at 16:04, Steven Boardman >>> <boardroomout...@gmail.com> wrote: >>> >>> Yes. >>> >>> Richard Furse’s Blue Ripple Sound uses HRTF tinting in their >>> decoder, it works very well. Although I think he may have a patent >>> on it…:) >>> >>> Steve >>> >> >> Hi Steve, >> >> what is HRTF tinting? I haven’t heard the name before.. >> >> Archontis > > There's a description in the text of the patent: > http://www.freepatentsonline.com/y2015/0262586.html > http://www.freepatentsonline.com/20150262586.pdf > > How multiple drivers can use HRTF tinting is unclear. > (but as most patents, they are difficult to understand). > -- > Marc > _______________________________________________ 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.
