XXHighEnd

Here's an interesting article by John Swenson that I haven't seen anyone mention yet:

www.audiostream.com/content/qa-john-swenson-part-3-how-bit-perfect-software-can-affect-sound

The reply comments are also interesting. (Peter is mentioned too.)

Mani.

Mwah, maybe not so interesting (of course everybody knows exacty what is (not) happening), but fun to read for me anyway.

Btw, Gordon Rankin measured the USB timing and even i2s and found no difference. Now is he someone who from the start admits that he can't understand (while being a first who should) and maybe I am not so sure whether his "measurements" on the USB interface + i2s were so correct. I mean, if he sees the USB packets being all the same (they just should not), I already won't believe that very much. But maybe.

Thank you Mani.
Peter

Thanks Mani, I'd missed John's last article, which I was looking forward to, in the rush of the holidays.

I'm puzzled about Gordon Rankin's response as well, since he was very positive about John saying similar things on the Computer Audio Asylum forum.

Why do I have the feeling that right from the first article Mr Swenson is following this forum ?

Did we ever read about "USB packet jitter" before someone in here started to buzz around about this ? maybe.
Anyway, like I said after reading the first article, to me it looks he has no real clues; doesn't have the whole picture, and spitting out the elements may come across as wise to you, but to me it does not.
In the whole world I know of only one person who can come up with these kind of things from theoretical reasoning and that is not him (I counted out myself temporarily). So ... just saying ... I see the 4th article popping up when we in here came up with something new first.

Maybe this was an inappropriate post ...

I guess you're referring to Pat at AR-T then? Though it's not just theoretical with him - he actually measures everything. I had some really 'interesting' email exchanges with him a few years ago. I learned so much. "Spdif (rca) is cr*p. AES/EBU is cr*p. 'Scientific Conversion' transformers are cr*p. Only true 75 Ohm spdif (BNC) is any good for MHz transmission. No-one else knows what they're doing. Most AES members are idiots." Etc, etc. Haha... brings back memories.

But the proof of the pudding is in the eating - apparently Pat's Legato II USB-to-spdif converter has 0.05pS of RMS phase jitter from 10Hz to 100KHz, with phase noise measured clean down to 0.01Hz.

Of course, if I've got the wrong guy then totally ignore what I've just said.

Mani.

Wrong guy. :)

OK, I'll have another crack. There's a guy on CA called Juergen  (JR_Audio) who posts very seldom, but seems to know what he's talking about. Here's an interesting thread where he was more-than-usually active:

http://www.computeraudiophile.com/f6-dac-digital-analog-conversion/universal-serial-bus-industry-standard-cables-connectors-and-communications-protocols-between-computers-and-electronic-devices-link-da-converters-10292/

I've got quite a few other names to hand if I'm still wrong ;-)

Mani.

Still wrong.
Btw, there are many more who know what they are talking about and that Juergen is sure one of them.

You can't even "do" the things I'm talking about if you're not skilled from all angles possible. Think me and the like ... :fishy:
;)

Jussi Laako (Miska) maybe? But I'm not sure how much he bothers about noise from the PC, etc.

Maybe Damien Martin?

Hmmm...

How much do the guys at companies like RME, Lynx and Merging really know about all this stuff, I wonder?

Mani.

Haha. At least you are in a better direction now. Notice that Damien has opposite thinking than Miska for crucial parts, which brings a clue in itself.

Matan Arazi?

How clued up is Amir Majidimehr in this area nowadays?

Mani.

:NY01:


Ah, it didn't take you that long after all. The 2nd.
Answer : not much anymore I'd say.

Well done Mani.
Btw, was this a game ?

Regards,
Peter

PS: Damien is really a great guy (met him in the US) and Matan should be crazy at the subject (was about to visit him but it didn't happen). Both though lack that one part that Amir knows about. Same lacking would count for John I think, but he will (!) make the connections. Miska doesn't want to know about it. And for example Gordon doesn't know it exists.

Ok, enough of these riddles. I hope we see this is not about persons.

Regards,
Peter

Yeah, of course.

But others might find it interesting to Google these names. There's a lot of interesting thinking out there, but it's all over the place. Actually, this forum is probably the best collective knowledge on the subject that exists. If a better one does exist, I haven't come across it. But would be happy if someone pointed me to it.

Mani.

Matan Arazi's Audeeva Conbrio music server certainly looks over the top. Peter you even get a mention in this intervew (http://www.ultraaudio.com/index.php?option=com_content&view=article&id=135:matan-arazi-on-music-servers&catid=31:general&Itemid=46).

Gas filled aircraft 'black box' to eliminate oxidation and EMI/RFI.  Wow. :wacko:

Anthony

Yeah, Matan was planned to be there at the seminar I gave with Damien (and his collegue) and Jon Reichbach (Amara), but Matan couldn't make it. Really a pitty that we never met.

Peter