Bubblepuppy wrote on Sun, 03 September 2006 13:57 |
Firstly I am an EE, and a Software Engineer
I wont hold that against you I promise.
just because it's new to you doesn't mean that engineers haven't known about it and designing with it for a long time.
Its not new to me, its just enginners think the lab is the real world.
Finally, your position is MADI & AES digital communications never have errors?
I give up, if its written in the spec then it must be true.... I think I will sell my new MAC dual core intel go find a 386 and live with the blazing speed of 100Mbits that never has any errors and more than eneough speed to meet all my audio needs.
PLEASE.
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I am back from a long weekend, and I see that the subject has changed completely. Instead of dealing with the comment about the effect or lack of effect of temperature on attenuation, instead of acknowledgment that the load DOES matter, instead of agreement that for audio frequency applications (under say 50KHz) the load resistance is higher then 600 Ohms (often 10KOhms) and that for 25MHz signals, which is most of digital audio interconnect, you chose to make a sharp turn, and talk about future formats that raise the frequencies to 1GHz.
Well, most readers that are not technical, would need to have a CLEAR DISTINCTION that will enable them to know that as long as they are dealing with analog audio or AES or SPDIF the temperature DOES NOT MATTER to cable attenuation. I am doing my part - I keep stating the parameters (less then 100 feet and under 25MHz) and that is a lot of margin!
Instead of conceding in a clear way that what I said is correct under the conditions (or that as a non EE you are in no position to know it), you keep arguing a different point, so in some indirect sense, you are "dragging" the argument to a different area where you may be correct. In GHz applications the skin effect is important, and so are other factors.
There have been some systems designed to distribute a lot of audio over high speed links, from Cat5 to optical... Some have been better then others. The engineering challenges of high speed communications will not be solved by the audio industry, and any audio engineer that want to send audio or anything else over the Internet will most likely use cables that meet the standards of Internet communications.
But coming here to an audio forum with a general claim that temperature rise will effect cable attenuation, INITIALLY WITHOUT A STATEMENT ABOUT THE VERY HIGH FREQUENCIES is way off. It is only AFTER I wrote my post that the issue does not exists at lower frequencies, that you started talking about GHz frequencies.
Again, in the cases that are of Daly interest to the audio people, such as cables for analog line levels and frequencies, or mic cables, or AES cables or SPDIF cables, the cable;e temperature is NOT a factor effecting attenuation!!!
When an audio person will need to send GHZ of data accross a network, they will resort to cables that are appropriate for a network. You can argue about skin effect, temperature and more for such applications. But a general statement on an audio forum that a cable temperature will cause attenuation creates the false impression that audio people should worry or consider the temperature of their cables. There are some important cable characteristics that are important factors for audio, for the sound itself. Temperature is NOT one of them.
Dan Lavry
http://www.lavryengineering.com