segunda-feira, 18 de julho de 2011

[3D Audio] Pure Stereo 3D Audio™

Pure Stereo 3D Audioor ("Pure Stereo" for short) is a recent breakthrough in audio technology (licensed by Princeton University) that yields unprecedented spatial realism in loudspeakers-based audio playback allowing the listener to hear, through only two loudspeakers, a truly 3D reproduction of a recorded soundfield with uncanny accuracy and detail, and with a level of high tonal and spatial fidelity that is simply unapproachable by even the most expensive and advanced existing high-end audio systems.


3D Audio Demonstration for 2 speakers. (Please place yourself in the middle of the speakers)



This is quite impressive and probably will be the future of 3D audio. In the paper at this link there is a very good introduction to Pure Stereo 3D Audio™. I did a resume of it in the following lines:


How does Pure Stereo work?
When the stereo recording is played through the two loudspeakers of a standard stereo system, the ILD and ITD cues are largely corrupted because of an important and fundamental problem: the sound recorded on the left channel, which is intended only for the left ear, is heard by both ears. The same applies to the sound on the right channel. Consequently, an audiophile listening to that recording on standard stereo system will not correctly perceive the musician to be standing on the extreme right of the stage but rather at the location of the right speaker.
In order to insure the correct transmission of the ILD and ITD cues to the brain of the audiophile, the sound from the left loudspeaker to the right ear, and that reaching the left ear from the right loudspeaker (called "crosstalk") should be cancelled.
Pure Stereo is based on a breakthrough in XTC (technique of crosstalk cancellation) filter design, that allows producing optimized XTC filters, called BACCH fi lters, that add no coloration to the sound for a listener in the sweet spot . Not only do BACCH fi lters purify the sound from crosstalk, but they also purify it from aberrations by the playback hardware in both the frequency and time domains.
The result is a 3D soundstage with a striking level of spatial and tonal fidelity never experienced before by audiophiles.


Does Pure Stereo require special room treatment?
Abating room reflections with physical room treatment (i.e. using sound absorbers on sound-reflective surfaces) in a listening room is always beneficial to any audiophile-grade sound system. For Pure Stereo the efect of sound treatment is equivalent to using loudspeakers with high directivity. The more directive the loudspeakers are, the less sound treatment is needed for Pure Stereo to produce a full and accurate 3D sound image.Therefore, in a reflective untreated listening room, directive loudspeakers are more desirable. In a well treated listening room with sound-absorbing surfaces,any loudspeakers, even omnidirectional ones, will produce an excellent 3D image.

Does Pure Stereo require sitting in a sweet spot?
Like for standard stereo, where serious listening requires the audiophile to sit in an optimal location called the sweet spot, Pure Stereo also has a sweet spot.
However, unlike standard stereo, where the sweet spot must be at a given location and in a vertical plane that is exactly equidistant from the two loudspeakers, the sweet spot of Pure Stereo can be designed to be anywhere in the listening room, because the Pure Stereo filter can compensate for any asymmetries in the listening configuration.
The Pure Stereo sweet spot is large and robust enough so that a listener sitting in it perceives a high-fidelity 3D image without having to strain to keep his head in a fixed position.


Does Pure Stereo require special positioning of the loudspeakers?
While Pure Stereo filters can be readily designed for a pair loudspeakers and a sweet spot in an any geometric configuration (including the standard stereo triangle configuration), it is highly recommended that the loudspeakers be positioned in the so-called \stereo dipole" configuration, which typically has the loudspeakers about 50 cm apart only.


Is the 3D realism of Pure Stereo the same with all types of stereo recordings?
The stereophonic recording technique that is most accurate at spatially representing an acoustic sound field is, incontestably, the so-called "binaural" recording method, which uses a dummy head with high-quality microphone in its ears. Until the recent advent of Pure Stereo, the only way for an audiophile to experience the spectacular 3D realism of binaural audio was through headphones.
Pure Stereo shines at reproducing binaural recordings through two loudspeakers and gives an uncannily accurate 3D reproduction that is far more stable and realistic than that obtained by playing binaural recordings through headphones.


How does Pure Stereo differ from other 3D audio techniques?
High order ambisonics (HOA) and wave eld synthesis (WFS) are two other techniques for 3D audio over loudspeakers. They are presently being developed by a number of research groups and can, in principle, reconstruct an approximation of a recorded 3D sound eld over a relatively large area (larger than the sweet spot of crosstalk cancellation techniques). However, unlike Pure Stereo, they require a large number of loudspeakers for playback.
Moreover, unlike Pure stereo, both HOA and WFS are incompatible with stereo recordings as they require highly specialized recording techniques involving a large number of microphones.

I let you with a Video explaining what is Pure Stereo 3D Audio™ by the words of it's inventor Professor Edgar Choueiri 


References:
[Studio360 website] http://www.studio360.org/2011/apr/29/adventures-3d-sound/
[3D3A website] http://www.princeton.edu/3D3A/index.html
[Pure Stereo 3D Audio™ Paper] http://www.princeton.edu/3D3A/Publications/Pure%20Stereo.pdf

77 comentários:

  1. I visited your blog for the first time and just been your fan. I Will be back often to check up on new stuff you post!
    say my name song by ceno

    ResponderEliminar
  2. I have been reading your posts regularly. I need to say that you are doing a fantastic job. Please keep up the great work.
    M PEARLS a.a.l The Movie Trailer

    ResponderEliminar
  3. It's really a nice and helpful piece of information. I'm glad that you shared this helpful info with us. Please keep us informed like this.
    Glib Golem What's Love song

    ResponderEliminar
  4. I wanted to thank you for this great blog! I really enjoying every little bit of it and I have you bookmarked to check out new stuff you post.
    V.O.S. Jon 'Neverdie'

    ResponderEliminar
  5. Thanks for the information and links you shared this is so should be a useful and quite informative!
    Dani Mathers

    ResponderEliminar
  6. This is easier and surely gives comfort to internet users. Thanks for sharing. Post like this offers great benefit. Thank you!
    A.K-Logan Browning Song

    ResponderEliminar
  7. I would be grateful if you continue with the quality of what we are doing now with your blog ... I really enjoyed it
    binaural sound test

    ResponderEliminar
  8. Spot on with this article, I really think this website needs more attention.  I'll probably be back to read more, thanks for the info.
    Adele

    ResponderEliminar
  9. Thanks for sharing your thoughts with us.. they are really interesting.. I would like to read more from you.
    Novel By Ginny Scale-Medeiros

    ResponderEliminar
  10. This is easier and surely gives comfort to internet users. Thanks for sharing. Post like this offers great benefit. Thank you!
    Style by Taylor Swift

    ResponderEliminar
  11. Nice article and informative as well. for few of people like me this article is really helpful.
    Music Theory

    ResponderEliminar
  12. Really!!! I am very impressed after reading this blog. thanks for providing deep information for
    Where Da Opps At by Trigga Trey X Darrius Millsz

    ResponderEliminar
  13. Thanks for the information and links you shared this is so should be a useful and quite informative!
    Gasparilla's first release in 2016 Cuba Libre

    ResponderEliminar
  14. Music expresses that which cannot be put into words and that which cannot remain silentLife as Bebé - Episode 1

    ResponderEliminar
  15. I am very impressed after reading this blog. thanks for providing deep information for music like this Ashley Iona - Taking Me Under, feat. Kevin Davy White

    ResponderEliminar
  16. Very interesting topic, can you post some further information on this subject.
    We Make It Work feat. KaCe The Producer

    ResponderEliminar
  17. Yes we should not forget the experience, nations those forget there past can’t get
    SAVE THE DATE By NABIL & JENAN

    ResponderEliminar
  18. wow i love t hat SO much... can i cut and paste it into my blog?? but give u credit, of course???
    Gave you my Heart by Heather Walker

    ResponderEliminar
  19. Congrats, determination and hard working never get bad result.
    inspiring motivational video

    ResponderEliminar
  20. I have read many blogs in the net but have never come across such a well written blog. Good work keep it up
    Justin Bieber - Love Yourself (Paul Butcher Cover)

    ResponderEliminar
  21. I wanted to thank you for this great read. Your blog is one of the finest blog . Thanks for posting this informative article.
    The Dishes Song - David W Taylor

    ResponderEliminar
  22. I am really very agree with your qualities it is very helpful for look like home. Thanks so much for info and keep it up.
    Silverbird - Smile (Official Video)

    ResponderEliminar
  23. Good information and great post.  I like the website, and am sure to keep returning.
    Gudda Mane Streetz - So Good

    ResponderEliminar
  24. I really like the fresh perpective you did on the issue. I will be back soon to check up on new posts! Thank you!
    Charles Cossetti - Go Hard

    ResponderEliminar
  25. I wanted to thank you for this great blog! I really enjoying every little bit of it and I have you bookmarked to check out new stuff you post.
    The Wild by Paul Maged

    ResponderEliminar
  26. You're soooo talented in writing. God is truly utilizing you in tremendous ways.
    Justin Bieber - Sorry Cover by Alex J

    ResponderEliminar
  27. This is really great news. Thank you for sharing it with us!
    Body Rock - Woodbury

    ResponderEliminar
  28. You made some good quality points there. I did a search on the topic and found many people will agree with your blog.
    Stonelove J - Urkel video

    ResponderEliminar
  29. I am satisfied that you simply shared this useful information with us.
    music post

    ResponderEliminar
  30. This article has great reference value, thank you very much for sharing, I would like to reproduced your article, so that more people would see it.
    amazing music video

    ResponderEliminar
  31. can someone tell me how to get the little avatars to appear in my comments section? thanks!
    Official Music Video for "Perspective"

    ResponderEliminar
  32. Your Post is very useful, I am truly happy to post my note on this blog . It helped me with ocean of awareness so I really consider you will do much better in the future.
    Mariah Carey - My All Cover by Bebé

    ResponderEliminar
  33. I would be grateful if you continue with the quality of what we are doing now with your blog ... I really enjoyed it
    Blacklist

    ResponderEliminar
  34. Your Post is very useful, I am truly happy to post my note on this blog . It helped me with ocean of awareness so I really consider you will do much better in the future.
    RMP - FLEXIN Music Video

    ResponderEliminar
  35. I have read many blogs in the net but have never come across such a well written blog. Good work keep it up
    best mixtape sites

    ResponderEliminar
  36. Your Post is very useful, I am truly happy to post my note on this blog . It helped me with ocean of awareness so I really consider you will do much better in the future.
    No Control by Laura Mendes

    ResponderEliminar
  37. You have a great blog - I would think your readership is very high?
    edm violinist

    ResponderEliminar
  38. I would be grateful if you continue with the quality of what we are doing now with your blog ... I really enjoyed it
    Borderline feat. Joyce Sterling

    ResponderEliminar
  39. Your Post is very useful, I am truly happy to post my note on this blog . It helped me with ocean of awareness so I really consider you will do much better in the future.
    Amie Penwell - Dogfight On The Moon

    ResponderEliminar
  40. You have got some great posts in your blog. Keep up with the good work.
    Mr. Shammi_Time Machine (Official Video)

    ResponderEliminar
  41. I really like the fresh perpective you did on the issue. I will be back soon to check up on new posts! Thank you!
    Villian - KD

    ResponderEliminar
  42. wow i love t hat SO much... can i cut and paste it into my blog?? but give u credit, of course???
    Michael Blu Music

    ResponderEliminar
  43. I recently came across your blog and have been reading along. I thought I would leave my first comment. I don't know what to say except that I have enjoyed reading. Nice blog. I will keep visiting this blog very often.
    Children's STEM shows Dubai

    ResponderEliminar
  44. The blog article very surprised to me! Your writing is good. In this I learned a lot! Thank you!
    Sleeping

    ResponderEliminar
  45. wow i love t hat SO much... can i cut and paste it into my blog?? but give u credit, of course???
    Can't Stop the feeling by Justin Timberlake

    ResponderEliminar
  46. I have read many blogs in the net but have never come across such a well written blog. Good work keep it up
    New Video RomeVice- da way

    ResponderEliminar
  47. I just came across to reading your blog it serve very useful information about the interiors thank u
    Paul Maged - "The Wild" (Official Music Video)

    ResponderEliminar
  48. Wow! Thank you! I always wanted to write in my site something like that. Can I take part of your post to my blog?
    Cover Of Adele's When We Were Young

    ResponderEliminar
  49. You have a great blog - I would think your readership is very high?
    Two Hand Tapping

    ResponderEliminar
  50. This is one of the most incredible blogs Ive read in a very long time. The amount of information in here is stunning, like you practically wrote the book on the subject. Your blog is great for anyone who wants to understand this subject more. Great stuff; please keep it up!
    No Other Bagger by Chiro Music video

    ResponderEliminar
  51. I have read many blogs in the net but have never come across such a well written blog. Good work keep it up
    Black Rock Revival-If You Want It

    ResponderEliminar
  52. Thanks for the information and links you shared this should be a useful and quite informative!
    English Language for movies and songs

    ResponderEliminar
  53. I wanted to thank you for this great blog! I really enjoying every little bit of it and I have you bookmarked to check out new stuff you post.Nursery Rhymes Lyrics

    ResponderEliminar
  54. Another helpful post. This is a very nice blog that I will definitively come back to several more times this year!
    Snackz Da Gawd - Feel So Good Freestyle

    ResponderEliminar
  55. Really thankful for this wonderful and informative blog about the music i really enjoys it.
    DIKKO - No destination

    ResponderEliminar
  56. Interesting blog of the music and all music are outstanding.
    autobiographical love song

    ResponderEliminar
  57. Interesting blog and very very outstanding musics and song i really love it.
    10 Shotz - Ar Too Fresh (Official Video)

    ResponderEliminar
  58. Thanks for sharing your thoughts with us.. they are really interesting.. I would like to swervey more from you.
    logo power bank

    ResponderEliminar
  59. Hi I really appreciate all the great content you have here. I am glad I cam across it!
    logo power bank

    ResponderEliminar
  60. Your Post is very useful, I am truly happy to post my note on this blog . It helped me with ocean of awareness i really appreciate it.
    Sonny Campbell Music

    ResponderEliminar
  61. Interesting blog and very very outstanding musics and song i really love it.


    Hip Hop Songs

    ResponderEliminar
  62. Really very nice and awesome music i really like it and all the details about the music are very interesting.

    Nadel Performance Avalon Hollywood

    ResponderEliminar
  63. Your all information about the music are really very acceptable and great well done.

    Pop Songs

    ResponderEliminar
  64. Your blog is very awesome, I am truly to this blog which is specially design about the music.
    Great job.

    Official Video Songs

    ResponderEliminar
  65. Keep it up,
    It's really a wonderful blog about the music,.

    Hip hop songs

    ResponderEliminar
  66. Really!!! I am very impressed after seeing the best music in this blog. thanks for sharing.

    piano music video

    ResponderEliminar
  67. Interesting blog and I really like your music and must appreciate for your blog.Good job.

    Street Money On Deck

    ResponderEliminar
  68. Nice blog and the details about it really interesting.
    I liked your blog.

    Rap Songs

    ResponderEliminar
  69. It is truly a great blog and nice collection of music.
    I liked your blog.

    completely relaxing Sounds

    ResponderEliminar
  70. Really an amazing info about music and I liked your blog very much.

    Van Breda Songs

    ResponderEliminar
  71. Interesting blog and very amazing all the music and song well done keep it up.

    VIRGINIA MAN SONGS 2017

    ResponderEliminar
  72. Very interesting and very out standing music and song and your blog providing very nice information well done.

    David Owens Songs

    ResponderEliminar
  73. Really thankful for this wonderful and informative blog about the music i really enjoys it.

    Zodiac Aerobics Video Song

    ResponderEliminar