it's probably under a femtosecond.
What are you talking about here? A femtosecond is a quadrillionth of a second. 10gbs would mean one 10 billionth of a second.
What are you talking about here? A femtosecond is a quadrillionth of a second. 10gbs would mean one 10 billionth of a second.
This is called "sample aperture jitter". Requirements scale linearly with frequency and exponentially with bit depth.
These a calculator here:
https://www.analog.com/en/design-center/interactive-design-t...
https://www.analog.com/en/technical-articles/aperture-jitter...
Sure enough, 32 bits sampling a 96kHz signal, which is the Nyquist frequency of 192kHz sampling rate, is 0.3fs. At 24 bits, it's more like 100fs, which is much more doable, but still not easy. Which is why audio bit depths usually don't go to 32 bits, despite formats like FLAC supporting that.
The practical upshot of this and other noise sources is that higher audiophile-grade bit depths and sampling frequencies are quite likely to have at least some of those bits swamped out by noise on real hardware.
This is just getting the audio recorded. Playing it back as physical sound waves adds something between quite a bit and radically more noise to the signal, even if there's never any lossy compression.
The point isn't that you shouldn't record audio at 32-bit depth (which you probably shouldn't if you expect it to bring much benefit, but that's by-the-by), it's that even if you did, and you have a 7.1 system with 8 uncompressed streams, you still won't be anywhere near the point where USB 3 cable grades will start to matter.
You're the one who asked for clarification on the footnote specifically.