A method and apparatus for detection of missing pulses from a repetitive pulse train including signal detection circuits for capturing the rising and/or falling edges of an input signal, time-stamping the captured edges, calculating the maximum and minimum instantaneous frequency over a specified time...http://www.google.se/patents/US6453250?utm_source=gb-gplus-sharePatent US6453250 - Method and apparatus for detection of missing pulses from a pulse train
