[ProAudio] stereo perception through headphones

[Sonovo]

Once again I refer to the Smyth Realiser. It will measure *your own* HRTF in any room you have access to, and recreate it virtually in headphones. It’s the best system I’ve heard, and a lot less than $54 000.

Best regards,

Thor Legvold
--
Sonovo A/S
Stereo + Surround Mastering & Production
Stavanger, Norway + Los Angeles, California
http://www.sonovo.no <http://www.sonovo.no/>
Tel:+47 900 55 868
Tel:+1 (310) 907-6885


> On 30 Jan 2020, at 18:44, Edward Gosfield III via ProAudio <proaudio at bach.pgm.com <mailto:proaudio at bach.pgm.com>> wrote:
> 
> Hello All
> For those who are intrigued, inspired by David, I looked into E. Choueiri at Princeton.  He spends  much of his academic time working on plasma physics and propulsion.
> 
> https://mae.princeton.edu/people/faculty/choueiri <https://mae.princeton.edu/people/faculty/choueiri>
> 
> But he also designed a stereo processing system which he intends to "remove crosstalk" through a set of methods including a 'universal filter', but culminating in individualized in-ear-canal measurements and a software package.  Apparently, though, this is mainly intended to improve reproduction through stereo speakers, (although reviewers found it effective on stereo speaker playback of binaural material)
> 
> Lots of links to academic papers on ambisonics and virtual soundfields.
> 
> He also has material related to binaural recording and playback, including links to a couple of vocal tracks to illustrate the 3D effect of his processing of stereo.  Unfortunately it's not music,  and is specified for particular speakers. (Jambox). If other speakers are used "the 3D effect will be compromised" . On my bookshelf SPICAs  it does create the illusion of a speaker behind the listener (left rear for me), which 'stereo width enhancers' don't do.  It's a bit reminiscent of some of the 'spatializers' for audio-for-video playback, but more specific in source placement.  Very interesting. I'd love to hear the real deal, on music that I know well or recorded myself.
> 
> Main audio website for Choueiri:
> http://www.princeton.edu/3D3A/ <http://www.princeton.edu/3D3A/>
> 
> news piece:
> https://www.cnet.com/news/rocket-scientist-converts-stereo-into-3d-sound/
> 
> Apparently I should have said "Head-Related-Transfer-Functions" not 'headphone related' .  One is HRTF, the other is HpTF ;-)
> 
> Here is an happy 'audiophile' reporting at length his subjective experience:
> [system obtainable for $5K-7K for the basic stereo speaker processing system, in 2017
> Including RME interface, binaural mikes for calibration, and proprietary software...
> Other versions  for $6k-$7k include adnl headphone equalization and processing features.
> MAC only.]
> 
> https://www.audiostream.com/content/bacch4mac-3d-audio-playback-system
> 
> and a 2015 report from the Mother Church of Audiophilia:
> 
> https://www.stereophile.com/content/bacch-sp-3d-sound-experience
> says:
> 
> "The price (including infrared tracking cameras, microphones, and a dedicated iPad controller) is $54,000" (circa 2015)
> 
> I'll wait for the mass market version.  It should take the video game industry by storm if they can manage to make it fit standard domestic computer capabilities.
> 
> 
> EG
> 
> On 1/30/2020 2:38 PM, David Josephson via ProAudio wrote:
>> As Scott mentioned, most stereo recordings intended for speaker playback translate poorly to headphone playback. There are some fixes for that, most of which involve feeding some of one channel's signal to the other channel with phase shift or delay. You end up with a different mix for the headphone listener. See the research of Edgar Choueri at Princeton for some recent work in this area.
>> 
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