Their drawbacks include significantly lower time resolution, high cost and invasiveness.
It also has a time resolution of 16 microseconds.
This technique has the best time resolution, but the efficiency is rather low.
The time resolution needed depends on brain processing time for various events.
A wide window gives better frequency resolution but poor time resolution.
This is the common format for the basic measurements obtained at a high time resolution.
If the required time resolution is not high, then counters can be used to make the conversion.
Thus both the approximate age and a high time resolution can be obtained.
For instance a musician might want to add a drum roll, but lack the time resolution to do so effectively.
The time resolution is not stated explicitly but seems to be a small number of minutes.
