filtering Recorded Lung Noise

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 :

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

maybe it can get good results. i don't know how to do it.

Answer 1

[Salaheddin Hosseinzadeh]

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!

[Salaheddin Hosseinzadeh]

If this is not satisfying, we can try some sophisticated filters.

[cob]

thank you for you reply , but this is not well satisfying , i just cant filter this high distorted peaks. im uploading 2 samples of my recordings.

[Salaheddin Hosseinzadeh]

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

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 ;)