Normalization of a signal with respect to another signal
I have had the same problem. My signals are coming from the MRI machine. In my case, the scaling is one of my options; in a way, I divided the signal A and B to the maximum of signal A, but I could not use z-score approach because the information has been embedded in the amplitude. If your signal is a non-amplitude modulated like a speech signal, you can use a z-score.