Trinaural decoding equations for 3 speaker stereo matrix ?
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 7th January 2013, 02:28 PM #131 SEdwards diyAudio Member   Join Date: Dec 2011 Last week I was listening to a 2-> 3 matrix with coeff 0.5 in Reaper (I'll upgrade to Markus' script, thanks for posting that). For the afternoon I'm using Dolby PLIIx from my soundcard (Xonar) output. What exactly does it do frequency wise? It cuts up processing band by band, but how? The Wikipedia article doesn't really say. Or am I totally mistaken and it is just a sqrt(2) center if I'm using 3 speakers.
Elias
diyAudio Member

Join Date: May 2003
Location: Suomi
Quote:
 Originally Posted by lolo What about directivity? I finally had 2 hours for myself last night and experimented with three quickly made pipe speakers, matrix from my old denon receiver and dayton RS100. It works!
I also started with cardboard tubes (diam about 12cm, length about 40cm) and FRS8 full range elements I lifted the tubes so that elements are on ear height. First listened with elements aimed to the listener, then aimed the elements towards the ceiling. This was with passive matrix wiring with coefficient of 0.5. So they were kind of omnis.

Then I placed a large (60*80cm) baffles just behind each tube to make them 2pi radiators, and it was much better !

Omni midrange ? I don't like it very much. It sounds too ambigouos and not very clear. Half space midrange is better, also with matrix.

- Elias
__________________
Liberate yourself from the illusion of two speaker stereo triangle
Dipole Bass vs Monopole Bass Stereophonic Sound from a Single Loudspeaker 3 Speaker Linear Stereo Matrix Wavelets

Elias
diyAudio Member

Join Date: May 2003
Location: Suomi
Quote:
 Originally Posted by lolo maybe?
Is it anywhere like this you made ?
__________________
Liberate yourself from the illusion of two speaker stereo triangle
Dipole Bass vs Monopole Bass Stereophonic Sound from a Single Loudspeaker 3 Speaker Linear Stereo Matrix Wavelets

a_tewinkel
diyAudio Member

Join Date: Feb 2008
Location: Enschede
Quote:
 Originally Posted by Elias Omni midrange ? I don't like it very much. It sounds too ambigouos and not very clear. Half space midrange is better, also with matrix.
I currently have cardioid mids. Much better and more clarity than with narrow boxes or dipoles too close to the wall.

markus76
Banned

Join Date: May 2008
Location: Switzerland
Quote:
 Originally Posted by SEdwards I'll upgrade to Markus' script, thanks for posting that
If you use the energy-preserving code then remove the 3dB attenuation for the center. Simply replace
Code:
`c_out = 0.7071*m_c;`
with
Code:
`c_out = m_c;`

lolo
diyAudio Member

Join Date: May 2010
Location: somewhere by the border..
Yep, something like that, but with three separate pipes and a 90 deg angle so they come out as three flowers. I really have to redo it there is just too much omni leakage in the mids, will report back.

Quote:
 Originally Posted by Elias Is it anywhere like this you made ?

 19th February 2013, 11:54 AM #137 markus76   Banned   Join Date: May 2008 Location: Switzerland Just for the sake of completeness here's the "final" Reaper code for a energy-preserving matrix decoder after Gerzon: http://mehlau.net/audio/matrix_decoder/
Elias
diyAudio Member

Join Date: May 2003
Location: Suomi
I found some more confirmation on Trinaural matrix coefficients from here

http://www.nubert-forum.de/nuforum/v...42a5023fc0a493

And the matrix coefficients according to them are:
Quote:
 L -> L - R/2 R -> R - L/2 C -> (L+R)/2
Which are the same as referenced earlier from another source.

The thing I don't know is how they know it

- Elias
__________________
Liberate yourself from the illusion of two speaker stereo triangle
Dipole Bass vs Monopole Bass Stereophonic Sound from a Single Loudspeaker 3 Speaker Linear Stereo Matrix Wavelets

 11th March 2013, 10:15 AM #139 markus76   Banned   Join Date: May 2008 Location: Switzerland That's TriSonic (AES Preprint: "An Optimum Linear-Matrix Stereo Imaging System") with a matrix factor of 0.5. Just a sub-version of Gerzon's energy-preserving decoder.
 11th March 2013, 11:20 AM #140 markus76   Banned   Join Date: May 2008 Location: Switzerland A post by Elias just got lost?

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