mscohere: reduce high frequencies noise variance.

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Edinburgh 2015-8-13

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https://ww2.mathworks.cn/matlabcentral/answers/233659-mscohere-reduce-high-frequencies-noise-variance

评论： Sainath Varikuti 2015-8-21

Hi everyone, I am trying to reduce the noise variance at high frequencies obtained as an output of computing the coherence between two tme-series. I played around with the overlap function, chosen different type of window (Hanning and kaiser) and increasing the window length up to 5 times approximately larger than the window length requires to resolve the frequency I am interested to. Below are the parameter:

Fs = 50 Hz; % Sampling frequency N = 3500; % number of sample NFFT = 172.4*5; Noverlap = round(98*NFFT./100); Window = kaiser(NFFT, 28);

[Cxy_B38,fxy_B38]=mscohere(B38_filter(:,5),B38_filter(:,6),wind,noverlap,NFFT,Fs);

Can someone give me a tip on how to further reduce the noise at frequencies above 1.5 Hz?

I am looking forward to hearing from you.

Axel

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Sainath Varikuti 2015-8-21

Hello Edinburgh,

You may pass the output of 'mscohere' function through a low-pass filter. The documentation page here provides examples of designing low pass filters.

Regards,

Sainath

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