filtering Recorded Lung Noise

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cob 2015-6-3

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https://ww2.mathworks.cn/matlabcentral/answers/222339-filtering-recorded-lung-noise

编辑： Salaheddin Hosseinzadeh 2015-6-3

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.

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Answer 1

Salaheddin Hosseinzadeh 2015-6-3

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https://ww2.mathworks.cn/matlabcentral/answers/222339-filtering-recorded-lung-noise#answer_181486

singlePole_lowpass.m

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!

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cob 2015-6-3

Recordings.zip

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 2015-6-3

编辑：Salaheddin Hosseinzadeh 2015-6-3

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 ;)

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