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Deep Stereo

DSP related issues, mathematics, processing and techniques

Deep Stereo

Postby juha_tp » Sun Dec 23, 2018 1:34 pm

Hello!

I bumped to this article "A new way to listen to music" by Audioreview (Italy) which introduces an 'effec' they call as Deep Stereo. Original article is written in italian but here's the link for translated (Google) version.

Patent mentioned in article - http://ieeemilestones.ethw.org/images/5 ... OCR%29.pdf

I don't fully understand thepapers to implement it. Has anyone here implemented this already using FS (or SM) ?
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Re: Deep Stereo

Postby Spogg » Sun Dec 23, 2018 4:22 pm

Hi juha_tp

I skimmed the translated version (the patent PDF was far too big and ugly to read :lol: ).

I get the idea that this topic might be relevant:

viewtopic.php?f=4&t=8934&hilit=ambiphonics#p35113

Cheers

Spogg
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Re: Deep Stereo

Postby HughBanton » Fri Jan 11, 2019 9:30 pm

That's really interesting. I was particularly fascinated to discover that, way back (even before my time), an attempt had been made to put FOUR channels onto vinyl discs, using the regular FM radio-carrier principle to put two channels on each groove wall. That's gonna work innit ... :roll: (4 channels on FM radio would have been even more of a challenge ...)

But it turns out it was the, more natural, 2-channel capabilities of vinyl that has ultimately landed us with the "stereo" we know, meaning '2 speakers' .. whereas the original investigators had been more keen on a 3-channel system for cinema. Who knew. It probably works better.

Converting two channels to three needs the (common) centre information isolating from the left and right channels, putting it on its own channel (C) and then removing it from L and from R.

Do we know how to do that? (I don't!!)
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Re: Deep Stereo

Postby juha_tp » Sat Jan 12, 2019 2:08 pm

HughBanton wrote:...
Converting two channels to three needs the (common) centre information isolating from the left and right channels, putting it on its own channel (C) and then removing it from L and from R.

Do we know how to do that? (I don't!!)


I found one try out as like this:

I am trying to implement Deep stereo concept. There are three speakers instead of two ones. Center speaker should reproduce common sound part, that presents both in Left and Right channels:

DIF_R=-1.0*L+R
DIF_L=L+-1.0*R
LR_CORE=L+R+-1.0*DIF_L+-1.0*DIF_R
L=0.5*LR_CORE R=0.5*LR_CORE

This works. Stereo effect disappeares.

But when I try to use DIF_L and DIF_R for Left and Right channels respectively, they are the same! I use headphones to check the sound:

DIF_R=R+-1.0*L
DIF_L=L+-1.0*R
L=DIF_L R=DIF_R
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Re: Deep Stereo

Postby HughBanton » Sat Jan 12, 2019 2:32 pm

Correct me if I'm wrong but I think there's an obvious falicy here :

LR_CORE = L+R + -1.0*DIF_L+-1.0*DIF_R ???

now the second half says
-1.0*DIF_L+-1.0*DIF_R
= -1.0 *(L+-1.0*R) + -1.0 *(-1.0*L+R)
= -1.0L + R + L + -1.0R
= 0!

therefore
LR_CORE = L+R = mono.

As far as I can see this can't be achieved by any simple matrix method.
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