What's the Latest MATRIX LP/CD Added to Your Pile? SQ, QS, RM, EV

[rustyandi]

first I do not have any involvement with the Surround Master
other than I have heard it and let other Quad collectors know about it
I am telling people what I have seen and heard
on my system
I have played with Quad in all it,s forms
for 40 years
I am not selling anything
I just enjoy Music

 

[bmoura]

Which leads to a question. Would improper "Encoding" in the 1970s affect any decoding? In other words, would "Decoding" also have to figure out the variables of each and every "encoding" from each original release? Does the original encoder factor in at all? Thanks.

Actually there is a thread here with Martin Willcocks, the inventor of the TATE system that suggested further decoding improvements could be made with the SQ System by detecting which encoder had been used on an album. How you do that is something that few know I suspect... !

 

[krkier]

Actually there is a thread here with Martin Willcocks, the inventor of the TATE system that suggested further decoding improvements could be made with the SQ System by detecting which encoder had been used on an album. How you do that is something that few know I suspect... !

Do you have the different types of encoders in your mind?:

- Classic SQ encoders
- Forward oriented SQ encoders
- Backward oriented SQ encoders
- London Box
- whatnot

Those encoding equations are known.

Or do you mean imperfections of an encoder itself, like having to apply 87° phase shift instead of 90° in decoding, because the encoder is a little bit "off"?

-Kristian

 

[oxforddickie]

Perhaps everyone can work together to get the "Math" correct if there is a problem. It is interesting as a "Matrix" guy to read about the math and try to wrap my head around how all these systems worked in the 1970s or not. Sounds, highly complicated.

But, would be great if we could all work together to finally crack the code once and for all. We rare few Quad folks are the only ones who care about this. Which makes the work just that more important. Thanks.

I've already done it..........

 

[oxforddickie]

first I do not have any involvement with the Surround Master
other than I have heard it and let other Quad collectors know about it
I am telling people what I have seen and heard
on my system
I have played with Quad in all it,s forms
for 40 years
I am not selling anything
I just enjoy Music

So your refusing my offer so you can back up your comments. Says it all........

 

[Old Quad Guy]

Or do you mean imperfections of an encoder itself, like having to apply 87° phase shift instead of 90° in decoding, because the encoder is a little bit "off"?

-Kristian

Hi, yes, I was just casually wondering if "imperfections of an encoder itself" changed the decoding math in any way. I was just curious as I'm trying to wrap my head around the math. Very interesting. I wonder how one would know if an encoder is "off?" Is there a way of knowing or does it not really matter.

 

[Old Quad Guy]

I've already done it..........

Hi, yes, thank you very much oxforddickie for your work with the scripts. They are really great, the best. Thanks again.

 

[oxforddickie]

Hi, yes, I was just casually wondering if "imperfections of an encoder itself" changed the decoding math in any way. I was just curious as I'm trying to wrap my head around the math. Very interesting. I wonder how one would know if an encoder is "off?" Is there a way of knowing or does it not really matter.

I'd like to add my views on this annoying point.

During my initial work on decoding SQ, i found that the test tones on the infamous SQ1000? test LP were actually off by a couple of degrees. This was caused by the use of normal tolerance (probably 5%) components of the time, so i'm guessing there's no encoder out there that is/was 'spot on'. This obviously goes for QS too.

I originally was going to go down the road of not using exactly 90 degrees, but to use, say, 87, but then i thought that there was no guarentee that the error on a particular encoder was not say a degree or two the other way, so i kept to using 90 degrees as it seemed the 'center point' of what was actually used.

I did try the 87 degree version on the test tones, and i really struggled to hear any worthwhile difference, and when it comes to music, i would doubt there would be any noticable difference at all.

Just my views on what is a very interesting topic, glad it was brought up

 

[The Bushmaster]

Hold on guys...Just for a minute...Need to get another beer from the reefer.

 

[oxforddickie]

get one for me, will you lol

 

[krkier]

Hold on guys...Just for a minute...Need to get another beer from the reefer.

...you might be completely drunk when we found the solution...

-Kristian

 

[krkier]

By the way:

If the encoder has imperfections with its phase shifting then the applied phase shift is constant over the whole frequency range (in theory, or better say "ideally"), as long as the encoder is only single path. If the encoder is tripple path (encoding divided into different frequency ranges) then only a paticular frequency range might be "off".

But when I think about turntables not of linear tracking type then things start to be even worse when it comes to software decoding, since the phase shift is depending on the lateral tracking angle error, and so depending also on the encoded frequency, means lower frequencies do not show as much phase errors than higher frequencies.

Now, Bushmaster, try to examine the math for decoding with ten beers intus.


-Kristian

 

[quadsearcher]

I've already done it..........

"all Work together?"

I enjoy the virtual camaraderie of all folks interested in quad. I wish I had more to add or share in the way of information.
I got into this way late, I had found books mentioning encoding equation when I was in high school, but had never heard quad, if I had I would have devoured that knowledge, I was into math and learning a lot more back then.

 

[The Bushmaster]

O K...I'll work with this for a bit.

SQ encoding...Front + rear (out of Phase)

CD 4 encoding (that's right, encoded)...Front + rear - rear. Rear encoded into hi-frequency carrier. Discrete my ass.

Whew...I need another beer and I seem to be out of chips for the moment.

 

[jaybird100]

Let it be Lowenbrau!

 

[krkier]

Let it be Lowenbrau!

I'm more into Schlappeseppel Kellerbier.

-Kristian

 

[jaybird100]

Not familiar with that one... gotta see if we can get it here.

 

[leevitalone1]

I'm more into Schlappeseppel Kellerbier.

-Kristian

Kritian, Americans have no idea what real greman beer is, unless they have experienced it. American beer is like water compared to the beer made there. I spent time in Werthiem and enjoyed many local brews.

 

[jaybird100]

Now, wait a minute! I'm an American, and I have put away my share of good German beer. I spent two years in Bremerhaven. Now, if there's any place that can drive one to drink, that's it!!! (Just kidding; it was a great place.)

 

[The Bushmaster]

Anyone for Greek Beer? Spent a month on Crete.