Dable at morse decoding

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Morse code has the following:
dit,dah , longPause,pause,noise

Classify the above by measuring the times.
look for max On, min On, max off, min off
dah = 3* dit
interword gap = 3* gap

http://en.wikipedia.org/wiki/Morse_code

so you need:
	function to report TONE_ON,TONE_OFF durations,
	function to classify TONE_ON, TONE_OFF,duration
	function to look for interLetterGap