insider9 said:
In that case please tell me how do you think a cable transmits bits? Transmission isn't digital. It's fully analogue but of a digital signal. There's is no data in the cable just electricity.
Please explain to me and only then you will understand. What is happening when a 1 is being sent and when a 0 is being sent. What actually happens?
By definintion it only has two states on and off - binary - this is a digital transmission. It doesn't allow for error in that respect, and it's pretty much irrelevent how that is transmitted, wether it be electrical puleses in the case of a usb cable (ie voltage over a certain level is a 1, under is a 0 - there's nothing inbetween, no grey, no granularity) or light pulses in an optical cable. That's what I was saying, you can transmit a digital signal in many ways. Morse code is classed as digital for example. That's the whole point of computers - that what you receive is exactly what you send, otherwise there is an error and it will not work. Please don't forget the first computers like the analytical engine were all mechanical, not a single cpu in sight, yet they still do what computers do, compute binary information. This is why we say that things such as usb cables cannot make a difference to the sound as all it is doing is sending a 1 or a 0 down it. It doesn't matter what that 1 and 0 represents. If a cable is faulty and sends a 0 instead of 1, you'll get an error, or a drop out, not reduced bass or less midrange. That would require digital manipulation which has to take place at either end of the cable. The same thing is happening inside your computer - voltage being used. A cpu is at it's heart a load of transistors, which work by manipulating voltage, just as the usb cable, there's no real difference until it gets out of the digital domain which is where the dac comes in. The USB cable in this line of thought is a red herring.
This is all computing basics, and one reason why people often do look down on audiophiles when they are literally trying to re-write how computers work by applying incorrct logic, such as the whole usb cable affair, to justify what they hear. It's frustrating because what they are effectively saying is that their logic trumps facts, trumps an entire multi billion dollar industry, trumps science, trumps an entire way of working such as the internet etc. If what audiophiles said were true, computer would literally not work, it's that simple.
insider9 said:
It's great to look down on people and say things like "the clue is in the name" when you start from admission that you don't understand what I said in the first place.
Apologies, it was not meant to come off like it, it was meant to be more tongue in cheek, given the job of a dac is to convert a digital signal in to analogue. It can't convert an analogue signal in to digital, thats an ADC job.
if you really want to know about USB, this is white paper on it -
http://sdphca.ucsd.edu/Lab_Equip_Manuals/usb_20.pdf