CH: An ANALOG signal!
Steve Silberman: I think this is where things get misconstrued. The signals we think of abstractly as “digital” are in fact high-speed analog square waves, susceptible to all of the same damage and distortions as any other analog signal.
This IS where it gets miscontrued. Of course the signal in a cable is analog. The way he say that is very misleading. The way he is trying to tweak people minds... See, even a square wave that is REALLY distorted, something that would sound aweful if it where an audio analog signal is still seen on the other side of an analog digital signal transmission as a 1.
Ok, that is very simply said. (The faster you try to push data, the more important the cable gets. For instance, a cable bus extension system for a PCIe bus x8 can only be about 2 feet long, and that only using fat redrivers. A PCIe x16 signal will have a possible transmit length of 12 inches in a well calculated trace before it needs redrivers, jitter cleaners, reclocking, buffers et cetera) (At those PCIe speeds, all the traces need to be the same length even, so the data arrives simultaniously. This is why, on motherboards for instance, you sometimes see traces that are looping around all over, instead of just a straight short line to the slot.
None of the PCIe stuff applies to USB audio, as USB audio is sooooo vevryyy slooooow. But a smart manufacturer of audio cables could twist the trace length idea, and offer usb cables that have exact tolerances length wise, and state how this perfect matching enables much better clarity, timing and rythem because all the digital signals are arriving at the proper instant in the total time domain.... Ya know? Send me money I'll build you one,
Another example. Analog audio in a cable is like you talking on a phone. (bear with me here) If you talk and say onethousandandone and the connection is really bad, the other person won't understand it. It might have breakups or it is just impossible to understand beacuse the audio quality is so bad.
Now, in a digital transmission, think of it like this: A 1 is a minute long beeep tone of a high frequency, and a 0 is a minute long beep of a middle frequency. If you have a really REALLY bad connection, the other person can still reconstruct the 4 minute transmission fully. Then he can reconstruct the analog signal and can say out loud: One thousand and one in perfect audio quality.
If nobody understand anything at all, then use smoke signals.