Denoising Audio Signal of Doppler

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Freeplot 2020-4-4

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https://ww2.mathworks.cn/matlabcentral/answers/515344-denoising-audio-signal-of-doppler

评论： Freeplot 2020-4-4

Hi there! Is it possible to remove signal below a defined power-threshold? For example all signals below the power of 5.

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Image Analyst 2020-4-4

Do you want to remove a signal if ALL of the elements are below 5? Or if the MEAN or median of all the elements is below 5?

Freeplot 2020-4-4

Is it possible to continuously calculate the mean/median value over a small section and remove the power below a certain threshold?

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Answer 1

Ameer Hamza 2020-4-4

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It depends on what do you mean by "remove." If you just don't want to skip those frequency values than do something like this

f = [f1 f2 f3 ..]; % vector of frequency values
s = [s1 s2 s3 ..]; % vector of power signal
mask = s > 5; % find the signal values greater than 5
plot(f(mask), s(mask));

For a specific solution for your signals, please share details of how the signal is stored or share the signals in a mat file.

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Freeplot 2020-4-4

rawSignal.mat

So I have an audio file and I want to remove/reduce the noise. The goal is to get a signal like in the image below:

First I designed a bandpass-filter and then I found out that the noisy signals have lower power than the doppler frequencies. So I want to reduce lower power signal with setting a threshold. In the following picture you can see the noisy singal in the spectrogram, which I want to reduce.