On 1 Nov 2012, at 23:07, Stefan Schreiber <st...@mail.telepac.pt> wrote:

> The next and valid question is if stereo via headphones actually works so 
> well at all... (Many people have problems, such as in-head effects, lack of 
> perceived "real space", etc.)
> 
> If you would fix these problems, then you could probably also reproduce 
> convincing binaural surround via headphones.

Of course stereo doesn't work through headphones! That's why there's a 
difference between stereo and binaural, because stereo assumes speakers being 
IN FRONT of the listener, not perpendicularly left and right of the listener. 
That's why there are head phone processors which in essence transcode regular 
stereo into binaural stereo.

Sennheiser sold such a processor for a while, I still have it somewhere. It 
worked rather well, except that the electronics were of inferior quality using 
cheap, low-power components. So then I had the choice of listening to 
super-clean audio from my Metric Halo headphone output, but have "in head" 
stereo, or to listen to grungy, muddy sound, with the proper sound stage.

That's also EXACTLY why UHJ needs to be decoded to binaural, because being 
stereo compatible, without decoding it works just as well or just as badly as 
regular stereo works on headphones.

A mobile device music player app can solve these issues for both UHJ and 
regular stereo by doing the proper binaural decoding/transcoding, and since 
it's an app and not a hardwired appliance, it's easy to let users select 
different HRTF in the app's preferences, or even let advanced users load 
personalized HRTFs.

Ronald

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