Dave Malham wrote:
Hi
On 28 June 2015 at 17:35, Dave Hunt <[email protected]> wrote:
Hi,
I agree with Stefan.
One would have to undo a binaural encode to something else, then do a
dynamic head-tracked re-encode.
This can be "sort of" done by using blind source separation techniques to
pull out the principle sources and their approximate positions then panning
them into a B format form, adding the remainder as a more-or-less diffuse
reverberant field. Note carefully I said "sort of" done - ok for consumer
stuff (after all, mp3 is ok for consumer stuff) but not for anything
serious, except for use in compositions, where the choices are down to the
composer.
Best
Another Dave
I wrote you would need the reconstruction of a real or "abstracted"
(say B format...) sound field from a binaural recording.
I don't believe there is a serious difference between "consumer stuff"
and "professional grade", in this case.
done by using blind source separation techniques to
pull out the principle sources and their approximate positions then panning
them into a B format form
Sounds a lot like some new forms of parametric B format decoders we
recently have discussed, but didn't implement yet. O:-) Beside of
this, I of course understand what you write...
Hint: Would you not need some (individual) HRIR/HRTF measurements, to
apply "blind source separation"?
The biggest problem I see is that different directions could result in
similar (even identical) ear signals. In a mathematical sense, you can't
invert. To find (pragmatic) "predominant sound" directions, you probably
have too little and too ambiguous data to start with.
It is hard to "prove" my point, though. On the other hand, I don't know
of any evidence that any people have (more or less...) successfully
demonstrated what according to you < could > be possible. :-)
Best,
Stefan
I did once try to transform a binaural signal to first order B-Format
ambisonics with height using Max/MSP using a fairly simple algorithm. It
sounded reasonably convincing, but was almost certainly not correct in any
sense. It was just an attempt to use binaural files in a 1st order
ambisonic environment along with mono, stereo, MS etc.
Ciao,
Dave
From: Stefan Schreiber <[email protected]>
Date: 28 June 2015 01:44:45 BDT
To: Surround Sound discussion group <[email protected]>
Subject: Re: [Sursound] Hooke: First Bluetooth Binaural Microphone
Anthony Mattana wrote:
We are currently in talks with software spatialization companies
regarding adding an algorithm that would allow Hooke to be used as a head
tracking audio playback option for VR scenarios. And this could be added to
your Hooke via a OTA software update months after you purchase the
headphones :-)
And how can you apply head-tracking to a binaural recording?
Last time I have argued that B format recordings allow (easy) application
of HT, binaural recordings actually not.
You can't reconstruct the real or B format sound field from a binaural
recording. If not, I don't see how you could apply HRTF data sets to
calculate a (new) binaural representation - corresponding to your current
head orientation. I am very open for smart algorithms, but still...
No way, IMO!
Best,
Stefan
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