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i must have the code for detecting a missin g pulse? do some one have some for me to see?
"monostables are so awfully noise prone"
They're just trying to make up for all the other pulses that he's lost...
In a high-end digital scope, you have to use very special designs to catch ps glitches.
But as soon as the pulses gets within "computable" range, I do recommend using a pin interrupt, port interrupt or a timer or similar to handle the detect of the pulse, or timeouts waiting for pulses. It consumes a single pin on the processor - and an external circuit will also require some transfer capability of the processor. But the advantage of being able to change the timeout value or possibly switch between positive or negative flank, ... by just updating a software parameter can be invaluable.
And a later software may be updated to look at the variance between the pulses, allowing detection of vibrations in a mechanical system or slow acceleration in an electrical motor or similar. Real hardware is nice to have when the processor lacks the capability of handling a problem. In most other situations, software is recommendable. A late software update may be the difference between winning or loosing an important deal - either by being able to match a competior, or to differentiate from them.