filtering Recorded Lung Noise
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cob
on 3 Jun 2015
Edited: Salaheddin Hosseinzadeh
on 3 Jun 2015
Hi, I'm a last year student , my final project is Analysis of Lung Sound. i've recorded an Lung sound using a electret microphone Pre-Amp an amplifier and a few filters. the sound which i recorded is Noisy and looks like :
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/150812/image.jpeg)
during last two weeks im trying to get rid of this noisy peaks , to get more smooth and noiseless sound. any suggestions ?
i think if i could follow the contour
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/150813/image.jpeg)
maybe it can get good results. i don't know how to do it.
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Accepted Answer
Salaheddin Hosseinzadeh
on 3 Jun 2015
Hi,
Have you tried filtering your data, very simply with a low pass filter?
I've attached a recursive single pole low pass filter which I wrote and it's pretty fast as it's recursive.
It's also easy to use, you pass the data, sampling frequency, and the cut off frequency, it should have a manual anyways.
Give it a try and let me know if you encountered a prob.
Good luck!
3 Comments
Salaheddin Hosseinzadeh
on 3 Jun 2015
Edited: Salaheddin Hosseinzadeh
on 3 Jun 2015
Hi,
You shouldn't have accepted my answer if it was not answering your question! I just tried the samples you attached! I tried sgolayfilt() as well as the low pass filter. I am clue less non of the worked
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/183821/image.png)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/183823/image.png)
Please have a look at Star Strider comment.
Also, I suggest you post another question, and don't accept the answers till you get what you want. You can vote for answers to show your appreciation if you want ;)
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