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In Reply to: Re: Compare with today's high technology... posted by Jon Risch on June 18, 2003 at 21:03:29:
"In most case, these super high frequencies are not being used directly, rather they represent a carrier wave, or a data transmission protocol, rather than a direct signal."Ah, 'in most cases', so you're just going to ignore the others I suppose. Most high density rf data signals(like 16PSK) depend on accurately decoding the phase shift of a signal, small distortions in phase cause data loss and force the system to resend the information slowing throughput. Although you might not "see" it as lost data, it doesn't change the fact that there was destructive interference that caused the system not to accurately capture the data on the first try.
"The transmiission system is deliberately made as robust as possible, to that interference will not damage the data transfer."
Hmmm, so audio engineers haven't done that? Seems to me that a 50 ohm impedance to drive one that is 10 to 50 thousand ohms is pretty robust.
However, there is the luxury in sending data that allows you to retry. However, to the design engineer, this is a back-up plan. the primary goal is to ensure the data gets there correctly on the first try if system throughput specifications are goign to be met.
"Distort the TV signal while it is in RF form, and it is hard to see any effect on the visible signal, it just isn't THAT high up."
I guess you've never seen ignition noise, "snow", or "ghosting". What about selective fading, where parts of the carrier are distorted causing color shifts?
"I am talking about the variuos digital audio dither algorithms in use, and the fact that you can hear differences between the various different types. Sony's SBM (Super Bit Mapping) sounds different than Apogee's UV-22 process, which sonds different than the other record company's dither algorithm. Studio recording professionals can tell you this is so, and folks who own CDP's with user selectable dither algorithms have also heard the differences too."
This has never been verified under rigorous test conditions, has it. The other problem with what you cite is whether or not the application was even implemented properly in the first place.
"So audio has the requirement that the signal linearity must be maintained dow to VERY low levels"
While I agree with you here, you are simply over stating the apparent robustnes of other mediums and the significant engineering challenges that must be overcome in order to have a sucessful system.
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Follow Ups
- Re: Compare with today's high technology... - Jitter_by_Coffee 06:16:34 06/19/03 (1)
- And while we're at it..... - Jitter_by_Coffee 07:59:17 06/19/03 (0)
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