How to find crackles symptoms in lung recorded signal (find signal in other signal)

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cob
cob 2015-6-17
Hi , i've recorded lung sound using electret microphone. the signal is filtered and clean enough. i have to determine if another signal exist in the recorded signal.
the other signal look like :
the specs of this signal is : IDW : >= 1.5 mS 2CD : >= 10 mS
I dont have any idea where to start .
Thank you in advance.

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