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1. Nashmil
   

   Member
   Joined: Dec '12
   Posts: 1

   Hi there,
   I would like to use "envelopedetction" function to detect envelope of a echo signal that I got from a probe.
   when I use this function, the envelope just follow the RF signal and almost repeat the signal. I tried to change the parameters in the function but I didn't give the correct answer.
   I should detect the envelope to have an image of the in front of the probe, I would be grateful if anyone can help me.

   Thanks in advance

   Posted 12 years ago #

2. Bradley Treeby
   

   Developer
   Joined: Mar '10
   Posts: 1,643

   Do the values of your signal fluctuate about zero? If not, try shifting the values using something like:

   signal = signal - mean(signal(:));

   Brad.

   Posted 12 years ago #

3. Pavel
   

   Member
   Joined: Nov '12
   Posts: 7

   If you try to extract envelope of PA signal, you may also like the following matlab expression:

   signal=abs(hilbert(signal(:)));

   Pavel

   Posted 12 years ago #

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