How can I implement a Whitening Filter?

I have to implement an algorithm for the measurement of muscle activation intervals from surface myoelectric signal. The sampled values are filtred by a whitening filter, indicates the whitening process applied to the simple series. Anyboby knows how I can do it?

Answer 1

[Kenta]

ZCA whitening is avaiable here. Although this demo is for images, it can be adapted to your signal data.

https://jp.mathworks.com/matlabcentral/fileexchange/74990-zca-whitening-for-image-classification-zca