Quadrobineg
Member
i know that the "diamond" setup has no relevance, but how would its encoding matrix look like? it can´t be the same as for Lf Rf Lr Rr, right?
No corner speakers just L, R, Cf, and Cb. The diamond pattern was later altered to the more familiar four corner configuration. There is at least one demo record for the diamond pattern Dynaco set up. I was going to post pictures but will have to dig out the album first. There is a thread or at least some posts here about it as well.i know that the "diamond" setup has no relevance, but how would its encoding matrix look like? it can´t be the same as for Lf Rf Lr Rr, right?
On the forum front page there's a section called QQ Links. It's easy to over look if you just check out What's New but certainly it is worth looking over. Forum member @MidiMagic has link there. It takes you to this:i feel like an aercheologist, wikipedia still has no information for me about the magic diamond, just as 20 years ago.
the stereo compatibility! is a major reasoning which i totally missed until now. (it is not like we would require that today for distributing digital music, but of course if it is part of the specs i should not ignore it)
in the current "version" i just "rotated the soundfield" of the square decoder, which is
Lt = L 1.0 + R 0. + Lb 0.64 - Rb 0.36
to
Ls = (L 1.0 + R 0.)/2 + (R 0. + Lb 0.64)/2 + (Lb 0.64 + Rb -0.36)/2 + (Rb -0.36 + L 1.0)/2
due to lack of description it seemed to be the most logical thing to do.^^
i know that the "diamond" setup has no relevance, but how would its encoding matrix look like? it can´t be the same as for Lf Rf Lr Rr, right?
It has to be different as you are encoding two back signals instead of one. Also you want the encoded signal to be compatible with stereo playback, you can't just rotate the diamond, to get four corners. The Dynaco and ElectroVoice were very similar/close. The encode and decode coefficients were determined subjectively. They are asymmetrical to give better subjective results without using any form of logic enhancement.
That is not the "diamond" Dynaco record that we are talking about it is this one.I have the record. Here is the listing.
View attachment 89472
I also have a copy of the Perrey-Kingsley Flight o9f the Bumblebee on their album without the 4D encoding.
That Discogs link is not the same record.
But it works equally well on the diamond and on the Dynaquad.That is not the "diamond" Dynaco record that we are talking about it is this one.
https://www.discogs.com/release/1875327-Unknown-Artist-4-Dimensional-Sound-Demonstration
Yes no cogging because you have speakers at the sides, you can get the same effect with the square layout if you simply move the rear speakers forward to the sides.But it works equally well on the diamond and on the Dynaquad.
....
With one difference: no cogging using the diamond speaker layout.
I have never seen nor heard of that record. I probably would have bought it if I had. And it would work equally well w3ith all of the systems I listed too.
I am tired of everyone looking at where the speakers are and thinking that the encoding equations must match the speaker locations.
I use exactly the same encoder to make a recording that plays the same on Hafler Diamond, Dynaquad, Electro Voice Stereo-4, Scheiber, Sansui QS, Dolby Surround, and Dolby Pro Logic I and II. That's because the overall RM system is the same for all of them.
It could be a good idea to just use the same encoder for it and average the speakers.
on the contrary it could be quite fun to try to support all these vintage formats as they are, and create 2 channels CD media for you people with your old analog decoders.
The systems I listed are so cl;ose to each other in how they work that the same encoder can make a recording that decodes correctly on all of them.