Human eyesight of color is dependent on a few opsin protein complexes with a phenomenal image processing engine strapped to it. This is not unlike a Bayer sensor where the color filter array (CFA) attempting to reconstruct color using 3-4 different, albeit overlapping bandwidths.
If anything, we've largely moved away from color fidelity (see something like my old 5D, which has pretty strong color separation) and a newer 7d, where the color filters are rather weak in order to improve ISO sensitivity.
Bit like some high end audio you hear at shows! The stuff that has you running from the room...
Color science is something one could easily make a career of. I went through the exercise once doing hand color separations and doing the moire eliminating screening for offset printing just to see how it was done. A miracle how well it works considering some of the beautiful books Aperature Press has produced.
One excellent reason to buy a UHD TV (4K) is for the color. There are more color bits used and it really makes a huge difference (I'm not exaggerating). There are more colors shown. The increase in detail/res is 2nd place. Yes, there are 4K DVD avail. But it is the color which got me and still does.
Check the samsung UHD -- 65 incher --- for example.
THx-RNMarsh
Check the samsung UHD -- 65 incher --- for example.
THx-RNMarsh
His writeup is totally useless, as is the test.
He targets his detractors in a writeup about a test method?
And he is claiming that it is intermodulation caused by the high and low frequency magnetic fields in the wire, so essentially points the conclusions that way.
His assumptions are without merit, and he has done nothing to test them.
John
You might be missing the point, as are others, by going off on a tangent. re color. NASA has a very high level of quality in its product/designs.... as built. Ultra reliable as well. Same with the top camera by leading camera makers. Or car makers. Or, watches. Or TV ETC.
Who in audio approaches that level of quality and reliability and detail and perfection?
What would it sound like if someone did an all-out effort in Audio? Seems, as in the other fields, something great would also be the result.
THx-RNMarsh
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Only if encoded into the source. Nice technical overview, looks like streaming the whole 9 yards will require 18GB/s
.UHD 101: Demystifying 4K, UHD Blu Ray, wide color gamut, HDR, 4:4:4, 18Gbps and the rest! - Acoustic Frontiers
yes, of course. And apparently it is in the PRO ($$$) camera/recorders et all. I see the color difference a lot of the time (not rare event) in many new movies and even such things as the NetFlix logo. My slightly used HD (also Samsung) did not show the visible range of color variations as this UHD. More bits is more betta. Keep 'em coming. More color bits, pls.
Its a very good step up.
BTW - I use Comcast fiber optic to the property and pay extra for higher speed than stock. Running it thru the latest and greatest highest speed modem.
This also uses the top-end UHD player from Samsung.
THx-RNMarsh
Its a very good step up.
BTW - I use Comcast fiber optic to the property and pay extra for higher speed than stock. Running it thru the latest and greatest highest speed modem.
This also uses the top-end UHD player from Samsung.
THx-RNMarsh
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It seemed too convoluted for me to read thru.... but seems to have detected Something. What did his method find that is real or useful... or lead to something useful?
How can we easily (?) test for IM production via field modulations etal?
THx-RNMarsh
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It is not possible to tell if he actually detected something caused by the wires, or the crossover, or the speaker, or the amplifier, or some flaw in his methodology.
It is not possible to tell. He threw a mess of a waveform at something, and when it comes up different, claimed it was caused by "magnetic inter-modulation" within the wires.
Think it through. How can a spectrum analyzing device which has ONE wire carrying many different frequencies into it's input section find that another wire carrying that exact same signal is modulating?
A better question would have been...a clampover current probe is a magnetic device. What kind of magnetic material was used in the construction of the clamp such that low frequency currents passing through will not cause non-linearity? As he mentioned, the test waveform had a high crest factor, so the possibility of magnetic saturation/non linearity is higher when all the signals are passing through vs either highs or lows. The most likely source of "magnetic inter-modulation" here is actually the magnetic element used to monitor the current.
Did he test his equipment for this possibility? What is the error band, what is the resolution, what is the accuracy?
He was too interested in proving his detractors wrong and his own prognostications correct that he did not ask the correct questions of his methodology.
John
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I don't think I do. Overwhelmingly, you see here that designs are specified like 'I have these OPA1234 opamps and great Dale resistors, please help me to design a preamp with them'. Spec the design, accept (whatever) the performance comes out of it. The road to (audio) hell.
NASA does something like 'build me something that can bring 2 persons at max 180 lbs each into earth orbit with 5 days life support and return on a max 4000 ft runway'. And then accept whatever the design looks like eventually. The road to (space) heaven.
The latter is usually called 'engineering'. The first is universally known as 'fashion design'. ;-)
Jan
@ John Curl:
A thought. I see these threads where people do group buys for parts and PCBs and building lots of designs by Pass, Self, Marsh. John you always say you want to discuss design. Why not design a simple preamp, that people can build, without unobtainable parts or complex matching procedures. Not the equivalent of a Blowtorch but a good solid design people can enjoy to build and listen to.
Are you game? Educate the next generation, or at least help them on their way? I'll even do your PCB design!
Jan
A thought. I see these threads where people do group buys for parts and PCBs and building lots of designs by Pass, Self, Marsh. John you always say you want to discuss design. Why not design a simple preamp, that people can build, without unobtainable parts or complex matching procedures. Not the equivalent of a Blowtorch but a good solid design people can enjoy to build and listen to.
Are you game? Educate the next generation, or at least help them on their way? I'll even do your PCB design!
Jan
Sorry Jan, I don't do simple designs that are easy for everyone to buy the parts for. I did those designs 40+ years ago, and I don't use standard bipolars anymore. However, there are threads that are very active here that I sometimes contribute to where simple to make preamps are being designed even today.
Up to you of course.
But people like Self and Bruno P do designs for diy audio that people love, but they are not their top designs they would do commercially - and nobody would expect that. It's a way to pass some of your experience and knowledge - and enjoyment - to all these diy-ers that enjoy so much building stuff. Nobody would expect you to give away your best-kept secrets, but you could produce a very nice design with two fingers up your nose ;-)
People would absolutely love that and thank you profusely!
I do hope you reconsider. Maybe sleep on it ;-)
Jan
But people like Self and Bruno P do designs for diy audio that people love, but they are not their top designs they would do commercially - and nobody would expect that. It's a way to pass some of your experience and knowledge - and enjoyment - to all these diy-ers that enjoy so much building stuff. Nobody would expect you to give away your best-kept secrets, but you could produce a very nice design with two fingers up your nose ;-)
People would absolutely love that and thank you profusely!
I do hope you reconsider. Maybe sleep on it ;-)
Jan
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?????
does this really lead to something to do with creating the best possible audio product(s)?
--------------------
Writing an article for a DIY building takes a lot of time. Then, there are a million questions forever to be answered.
Help when things go wrong. On and On. I'll do Jan one better, I'll work with you (JC) to create and build the best quality and performance for a High-End audio product on this or any other planet.
Up to you, of course.
-RNM
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Of course the 'you are there' John is referring to requires a fully enveloping soundfield, which 2 channels can only get to a poor facsimile. If you have a difficult room with inherent compromises, as I do it gets even harder. Moving would be a good solution to this, but I always wonder what else could be done to deal with these compromises so have started trawling around what there is on abient enhancement to read without an AES membership.
The work of Gerzon indicates a few areas the could be interesting to experiment with, such as his 4-channel experiments with L,R, sum and difference, but they are recording dependant and very few sleeve notes tell you how something was mic'd and mixed. So I trawled a bit further and found some linktwitz notes on ambient enhancement.WATSON-Stereo_Expansion_Loudspeakers . This is interesting but has only been investigated by SL for the case of solo listening in a chair where you can get the ambient speakers almost next to you. Not something I could do , and I am left wondering if part of the effect is helping balance the power response as he has abandoned this approach with the LX521.
There is of course the Halfer setup using difference signals at the rear. With DSP readily available maybe a different approach can be adopted for each recording, even if the multi-miked hell of 80s DG is beyond recovery. Any other ideas of where I could research?
Aside: BBC R&D did some binaural recordings at the proms this year which they have put up. I suspect only for UK sadly, but they are interesting to listen to. So far, like the chesky releases they have not completely wowed me. I will retest with my koss electrostats later, but with with my etymotics The perspective is that of being dangled over the orchestra and I am not getting the ambience I would have expected,although a welcome improvment over stereo. It could of course be the non-high end amplifier I am using
Binaural Broadcasting - BBC R&D has some info on the project. Chances that someone here knows at least one member of the team must be high!
Spatial Audio for Broadcast - BBC R&D is also interesting. Good to see the BBC at least exploring ways of enhancing the experience for broadcast.
The work of Gerzon indicates a few areas the could be interesting to experiment with, such as his 4-channel experiments with L,R, sum and difference, but they are recording dependant and very few sleeve notes tell you how something was mic'd and mixed. So I trawled a bit further and found some linktwitz notes on ambient enhancement.WATSON-Stereo_Expansion_Loudspeakers . This is interesting but has only been investigated by SL for the case of solo listening in a chair where you can get the ambient speakers almost next to you. Not something I could do , and I am left wondering if part of the effect is helping balance the power response as he has abandoned this approach with the LX521.
There is of course the Halfer setup using difference signals at the rear. With DSP readily available maybe a different approach can be adopted for each recording, even if the multi-miked hell of 80s DG is beyond recovery. Any other ideas of where I could research?
Aside: BBC R&D did some binaural recordings at the proms this year which they have put up. I suspect only for UK sadly, but they are interesting to listen to. So far, like the chesky releases they have not completely wowed me. I will retest with my koss electrostats later, but with with my etymotics The perspective is that of being dangled over the orchestra and I am not getting the ambience I would have expected,although a welcome improvment over stereo. It could of course be the non-high end amplifier I am using
Binaural Broadcasting - BBC R&D has some info on the project. Chances that someone here knows at least one member of the team must be high!
Spatial Audio for Broadcast - BBC R&D is also interesting. Good to see the BBC at least exploring ways of enhancing the experience for broadcast.
Only stinkin' rich gullible snobbish idiots will buy it, to the satisfaction of the designer, manufacturer and dealer.
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