merlyn wrote:One legitimate reason for a higher sampling rate is nothing to do with our perception of ultrasonic frequencies. It's to make the design of the anti-aliasing filter easier, cheaper and with less likelihood of it affecting the passband.
Fair point -- although the benefit of double sample rates is not so much about making the filter design easier as accommodating the inherent flaws in standard filter designs.
It's certainly true that typical 'half-band' filters operating at base sample rates have the potential to introduce aliasing, although these unwanted artefacts usually only become apparent when recording very high levels with very strong harmonics or HF content.... Which is not that common a situation, to be fair.
Did you hear ringing or did you see it on a scope?
I believe he was talking about seeing it on a scope. There really isn't anything to hear. As explained earlier, it is a natural and benign side-effect of some very high order and inherently inaudible harmonics being removed.
But it's worth noting that this is a different kind of 'ringing' to the often memtioned pre- and post-ringing associated with the linear phase filter's impulse response.