For those who are interested in binaural rendering of B-format and HOA with
head tracking (VR, 3D Audio headphones, ...), we have started to made
available our SDK in which we have included capability to do that (we are
strong supporters of the HOA paradigm!).
PS: please do not see that as advertis
On Thu, Feb 25, 2016 at 09:25:48PM +, Politis Archontis wrote:
> - Measure the HRIRs at Q directions around the listener
> - Take the FFT of all measurements
> - For each frequency bin perform the SHT to the complex HRTFs,
> up to maximum order that Q directions permit (and their arrangement
I wouldn’t call BVE a consumer show, really. It’s aimed at broadcast, film and
TV professionals and most of the gear on show is pretty high-end stuff. The
chap I was talking to was a fairly high-up exec, but obviously not fully clued
up on Ambisonics and at least he asked to be informed of what
Hi Fons,
True, slight mistake! for equiangular grids it should be (N+1)^2<4*Q.
You are absolutely correct about the linearity and the exchange of the order of
the transforms. And the virtual loudspeakers approach should be exactly
equivalent, and that's the main reason I don't understand why on
And I forgot to mention in the previous message that, while I don't see any
benefit in the virtual loudspeaker approach, I see benefits in the direct
approach. Doing the virtual loudspeaker decoding, you'll need some uniform
arrangement of decoding directions that will be most likely of more poi
On Sat, Feb 27, 2016 at 11:54:39AM +, Politis Archontis wrote:
> And I forgot to mention in the previous message that, while I don't
> see any benefit in the virtual loudspeaker approach, I see benefits
> in the direct approach. Doing the virtual loudspeaker decoding, you'll
> need some unifor
> No, this is not true. The decoder and convolution matrix can be combined
> into a (N+1)^2 * 2 convolution matrix.
Ah true! by summing the terms..
> The only remaining difference is the set of directions. And it is known
> that using too many speakers for a given order is suboptimal.
So what is
On Sat, Feb 27, 2016 at 12:21:30PM +, Politis Archontis wrote:
> > No, this is not true. The decoder and convolution matrix can be combined
> > into a (N+1)^2 * 2 convolution matrix.
>
> Ah true! by summing the terms..
>
> > The only remaining difference is the set of directions. And it is k
>> So what is the benefit then of adding a decoding stage in the middle?
> The advantage of having an explicit decoder stage is that you
> can tweak the decoder for optimum results. For example it can
> be dual-band [1], or have some front preference, etc.
I see. I find that more a matter of pref
On Sat, Feb 27, 2016 at 12:52:20PM +, Politis Archontis wrote:
> One case I can think of when it is really necessary is when one needs
> to auralize binaurally the effect of a certain decoder, e.g. due to
> non-uniform arrangement of virtual loudspeakers, compared to an ideal case..
The poin
> The point is that, since the direct method is equivalent to
> a decoding for the set of directions used to compute the SHT
> (which will be the set for which you have HRIR), there is
> nothing 'ideal' or special to it. It is just one specific case
> of the decoder + virtual speakers method in dis
On Sat, Feb 27, 2016 at 01:19:40PM +, Politis Archontis wrote:
> > The point is that, since the direct method is equivalent to
> > a decoding for the set of directions used to compute the SHT
> > (which will be the set for which you have HRIR), there is
> > nothing 'ideal' or special to it. It
umashankar manthravadi wrote:
I was trying to say something else. The head moves independently of
shoulder position. Pinnae are rigidly linked to the head; the
shoulders are not. That is what made me think the two should be
treated separately.
umashankar
Sorry for coming back "late":
you can move head in relation to shoulders - tilt, rotate and so on - and
shoulders in relation to head (eg lift one shoulder) - so although these can
all be mapped to a cartesian frame of reference, that might not be the best way
to mathematically represent it - for instance, you might curve th
The OSSIC Kickstarter campaign has now raised more than eight times
their fundraising goal. They're at over $811,000 with more than 50 days
left to go.
One video on the Kickstarter page gives some hints how they're deriving
HRTF. It implies that they measure the inter-ear distance, plus two
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