What does normalizing a random signal in robust control mean?

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Pavel Osinenko

Normalizing means subtracting the (sample) mean and dividing by the (sample) standard deviation.

Salah Eddine Ghamri

i think it means subtracting the redundancy of some samples and make it uniformly distributed i think ...

Mehdi Baghaee

Why we use disturbance normalization in robust control? As you know we also use a weighted transfer function to pass the normalized disturbance signal through it, why we use this transfer function and how to determine it?