Audio channel timing

Can someone point me in the right direction please? I need to calculate a
unique time "marker" in a hi-fi (20Hz - 20 kHz) audio path during a sample
period of a few seconds or so.

It doesn't matter what sound event(s) go into the calculation or where the
marker is placed with respect to any particular sound events in the audio
path, so long as the marker is unique and repeatable. If necessary we can
continue the sample until the calculation produces a result.

Second question: The calculation must be repeatable, given the same input
audio. In other words, multiple measurements of the same sample should
produce a marker in the same place. Is it practicable to get repeatability
much better than the period of the highest audio component (20 kHz)?

Thanks for any help.


.

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