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I was wondering if someone could point me to an algorithm/technique that is used to compare time dependent signals. Ideally, this hypothetical algorithm would take in 2 signals as inputs and return a number that would be the percentage similarity between the signals (0 being that the 2 signals are statistically unrelated and 1 being that they are a perfect match).
Of course, I realize that there are problems with my request, namely that I'm not sure how to properly define 'similarity' in the context of comparing these 2 signals, so if someone could also point me in the right direction (as to what I should look up/know, etc.), I'd appreciate it as well.