mscohere: reduce high frequencies noise variance.
1 vue (au cours des 30 derniers jours)
Afficher commentaires plus anciens
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/148028/image.png)
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
1 commentaire
Sainath Varikuti
le 21 Août 2015
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
Réponses (0)
Voir également
Catégories
En savoir plus sur Multirate Signal Processing dans Help Center et File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!