stay calm?
I am SLF but I have written numerous computer programs containing sanity checks on inputs.
It seems to me there two main ways to make a plane go faster -- nose down or extra thrust. In both cases the speed builds up, doesn't jump 50 or 100 instantly, right? and there are duplicate/triplicate inputs in the knowledge that they may develop faults?
Looks to me they've written it for ideal conditions, assuming the inputs are all true, when the triplications show they know full well they may not be.
So if the nose is more or less level and thrust has not been increased, why on earth should it think it has started to overspeed in the space of 2 or 3 seconds?
Why can't the computer be told to STAY CALM in any situation when an impossibly fast change of speed (or altitude I guess) seems to have occurred? ideally also tell the pilots there are input discrepancies, to get them alert and ready, just in case.