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"digital" is NOT digital

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Originally posted by: BrownTown
If all you are saying is that the digital signals are infact represented by real valued voltages which can be affected in transmission than this is certainly not a big revelation to most here. The whole point though is that given a decent transmission line the distortion can be completely removed. So long as the noise in the distorted signal is not large enough to completely overshadow the actual data then a PERFECT transmission of data can be achieved. With an analog signal this is not possible because it is impossible to separate the noise from the actual signal. OF course you can try your best by modeling the channel be measuring the distortion in known signals and the like, be information is ALWAYS lost given a non trivial data stream.

I'm out of my element here but I agree. It would seem to be much easier to distort an analog signal due to the fact that the information is in a continuous wave form is more susceptible to degradation than one that is quantized (represented by a number system like binary). If the suggestion by OP is merely that both signals have time as a factor, well, duh.
 
Originally posted by: spidey07
Originally posted by: destrekor
but to continue the argument of the last thread, are you belief that digital coaxial is better than digital optical, or that HDMI presents a better digital medium versus digital optical? I know HDMI v1.3 can handle lossless audio for 7.1 with what, 30 audio streams? Can digital coax handle that same load? And can digital optical handle that load? I'd like to imagine so.

I'm of the opinion that packetized audio does not suffer from jitter. Non packetized audio does.

But from a transmission medium perspective, coax greatly surpasses TosLink in terms of bandwidth. Just look at the specs of TosLink transmitters and receivers...that should tell it all.

Bandwidth only matters if the bandwidth of cable is less than that of the signal. If a cable can handle 10 Gbs or 100 Gbs doesn't matter if the signal is only 1 GBs
 
Originally posted by: FoBoT
and the wii thread has a "digital is digital" reference at the moment, also talking about what cables to use with the wii

That was my post...what's your point? It was a question of whether cheap HDMI cables will get the job done...not if they will work with the wii, it just happened to be in the wii thread.
 
They've introduced new bits into the digital world? Do we now have 0,1 and 2. I'll be damned. And all this time I thought digital was just 0's and 1's. Now I have to account for 2's!!

DAMN YOU!
 
Originally posted by: Specop 007
They've introduced new bits into the digital world? Do we now have 0,1 and 2. I'll be damned. And all this time I thought digital was just 0's and 1's. Now I have to account for 2's!!

DAMN YOU!

No those are reserved for folks that don't know a bit about tubes. 😛
 
Originally posted by: spidey07
Originally posted by: FoBoT
😕

:thumbsup:

i thought i had accidentally clicked on "highly technical" for a minute

It'll get more exposure here and hopefully will have some good posts. I don't proclaim to be a super EE guy as I got out of school 14 years ago. But there have been some very good posts on this subject in OT.

I merely want to dispel the "digital is digital" myth.

is that a valid excuse?
 
Originally posted by: spidey07
Originally posted by: BrownTown
If all you are saying is that the digital signals are infact represented by real valued voltages which can be affected in transmission than this is certainly not a big revelation to most here. The whole point though is that given a decent transmission line the distortion can be completely removed. So long as the noise in the distorted signal is not large enough to completely overshadow the actual data then a PERFECT transmission of data can be achieved. With an analog signal this is not possible because it is impossible to separate the noise from the actual signal. OF course you can try your best by modeling the channel be measuring the distortion in known signals and the like, be information is ALWAYS lost given a non trivial data stream.

I'm talking bandwidth and the rise/fall of the signal.

You can't stop the signal.
 
PCM audio has no error check. It isn't packetzed, but it is framed.

So, what you're saying is you install Windows XP from a vinyl record because CD's don't offer enough fidelity?

Last time I listened to 'Linkin Park' on my home stereo transmitted via toslink from my PC it sounded like Linkin Park and not Britney Spears either.

At some point all those 1's and 0's, be it audio/video, have to be converted back to the analog realm anyways. I leave it up to the designer of the D/A converter to figure out the time domain problems and not the cables or interface connecting my gear dude.
 
I don't know, I mean don't quantum CPUs work on the theory that 1's and 0's can exist at the same time?

I don't even know what TosLink cables are, I just thought I'd throw that in there.
 
This can lead to undesirable results such as a "lip sync" effect where the audio is no longer properly synchronized to the video

Which is a software problem and not an issue with the digital domain.

Lets ask Hollywood studios how many pirated videos in terms of terrabits are pulled off the internet daily through international routers, satellite relays, stored in millions of packet buffers in all those routers and switches incurring time domain errors in the hundreds of millseconds, and then reassembled on your PC for your viewing pleasure.

So, transmitting data from one side of the globe to another is easy, but sending a digital signal from one home appliance to another somehow requires Stephen Hawkings to do it correctly.

Yeah....right.
 
Originally posted by: spidey07
Originally posted by: edro
Who are you arguing with?

Isn't this common sense?

You'd think.

But there is a mass misinformation amoung most people that "it either works or it doesn't" when it comes to digital transmission. That is what I want to spark the conversation about. I've seen some very good posts on OT that know exactly what I'm talking about but can articulate it much more intelligently than I.

But the transmission of the signal does not necessarily effect the playback of the signal. Sure, there might be some jitter or delays in receiving the signal, but thats what buffers are for. It doesnt matter how screwy the transmission of the digital data is, as long as the digital data is received intact and in time (aided by a buffer).
 
and poor specs of TosLink transmitters and receivers

The specs can be poor because the timing latency makes it nearly a moot point. Again, this is a function of the circuits invloved with moving the data from one carrier type to another and not the medium in play. You get what you pay for, and at some point the data must be converted to analog, even if it's propogation on an electrical circuit that causes a gate to register it as a 1 vs a 0.

A crude analogy is first generation CD burners that made coasters all the time. Gee, was it a problem with the digital data baing corrupted? No. Was it a problem with the laser beam being bent by a black hole? No. The problem was caused by poor buffering circuitry and other mechanical issues that had nothing to do with the digital domain.

Last I checked a digital signal, be it Toslink or ethernet could be transmitted across a multitude of media types and still retain 100% precision to the original source. Done that with analog lately?
 
TOSlink max length is 5 or 10 meters.

So that should tell you something about the quality of the fiber *chuckle* and the transmitters/receivers. Coax is much longer, don't know the spec. That's where the high bandwidth of coax comes into play - a higher bandwidth cable will not alter the edges as much as a low bandwidth one as length increases.
 
Overall I think in the VAST majority of cases, there are much bigger issues with people's systems in components, source, setup, and calibration where an issue like this doesn't make enough difference to worry about.

It may very well make a difference, but I don't think this is something significant enough that people should really be worrying about it.
 
this has absolutely no relevance to any consumer. no one gives a fvck about bandwidth or transmission losses when they are connecting their DVD player. it's just not an issue. they can buy whatever cable they want and the signal will get there intact. they can use TOSlink or coax or ethernet or whatever they freaking want. and yeah, a good quality clock makes a difference in the resulting quality of the playback (or recording), but again, no consumer will ever notice or care. let the recording and mastering studios worry about clocks and transmission formats. adding more resolution and increasing sampling rates will make more difference than fixing the tiny errors in timing on the consumer side of playback, especially since it vastly decreases the effect of any given inconsistency.
 
Digital circuit = Analogue circuit that has been castrated to represent only 2 states. And the problem with PCM jitter has nothing to do with "digital". It's a poor implementation of digital transmission. Packet based transmission is not subject to jitter issues. Toslink=Crap, you want optical connection, go AES/EBU or stick to trusted 75ohm 95% braided+foiled RG-59 coax. If you are truly paranoid go RG-6, but good luck on finding RCA connectors that fit.
 
Originally posted by: KLin
What is HDMI FTW? I'll take Home Theater for 800 Alex.


High Def Media Interface. Yet another attempt at controlling content. Badly executed and a pain in the ____ (Insert your pick of body part) to make it work. It's the worst interconnect in the history of interconnects.
 
Originally posted by: spidey07
TOSlink max length is 5 or 10 meters.

So that should tell you something about the quality of the fiber *chuckle* and the transmitters/receivers. Coax is much longer, don't know the spec. That's where the high bandwidth of coax comes into play - a higher bandwidth cable will not alter the edges as much as a low bandwidth one as length increases.

I don't know much about TOSlink but I have a feeling thats because they use crappy plastic core cable not the typical glass core fiber used in communication system. Also single-mode fiber will allow for much longer distances because modal dispersion is no longer an issue.
 
Originally posted by: Tom
on the subject of time, is time faster than the speed of light ?

seems like it would have to be, or nothing would ever happen.

Yeah..thats why you have to go warp 10 and slingshot around the sun to time travel.
 
Two things that makes all this debate worthless at best for most applications:

Talk about jitter and bandwidth all you want, you should not be able to hear the difference between coax and optical in practical listening tests.

The bandwidth of Toslink is more than enough to handle compressed DD/DTS streams and PCM audio
 
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