I am learning about signals in school but I found it very hard. Can someone help me by giving some references about any books?
We are studying Fourier transform, signal power, filters, digital and analog etc.
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Without knowing what you find hard, it is difficult to recommend a specific book. Some are hard to read to. So, oldies but goldies, I suggest you to start with video lectures, and for instance by godfather A. V. Oppenheim
and tell us where you have trouble (and why).