Hi.
(I assume the morse code contain only short beeps and long beeps.)
I dont know how u get the morse wave, sine waves or square
waves, if its a sine wave, connect it into (4049) cmos
inverter, and convert it into square wave.
Connect it to the timer, and count the pulses you get.
if its more than x+100 its a long beep, if its x-100, it
short beep.

Goodluck.
OK