usb cables?

[JanRSmit]

2 hours ago, crenca said:

 

Do yourself and your wallet a solid and learn a bit about the basics of digital communication...

So, enlighten us with some basics relevant for computer-dac communication.

For one i know that with usb cable use between computer and large format printers, the USB cable quality does matter.

[JanRSmit]

7 minutes ago, marce said:

 Its not the signal as such its the information carried in the signal, this is where analogue and digital differ. In analogue the signal is the information a time varying waveform, noise is superimposed on the signal and becomes part of the signal especially noise in the same frequency range as the signal. Digital carries the analogue signal as packets of information in binary format, noise can be superimposed on the signal but does not become part  of the analogue information and within easily achived tolerances the noise will not alter the transmitted information.

So , to understand what you are saying, in the case of digital info, noise (which is always present) will not somehow interfere if it stays below a certain level. Then the questions i have:

How is this achieved in essence?

does the noise spectrum make a difference?

Is this true also for computer to dac communication?

How do i as enduser know the always present noise is not interfering? 

[JanRSmit]

57 minutes ago, marce said:

The reference is to noise superimposed on the digital signal, not EMC engineering of a system. The comment is reffering ton the signals travelling down a wire and comparing an analogue signal to a digital signal and the effect of noise on these signals. If the eye opening of a digital signals eye diagram is within the required specification then the digital data will get through.

System noise problems comes under EMC engineering, well studied, very well studied, lots of information out there on EMC.

Tanks for pointing to eye diagram. Two main causes are jitter and noise, perhaps also signal strength. This is under the assumption that the cable and plugs and receptacles themselves and together function flawlessly. Correct analysis?