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I am a beginer. I have read that any given signal whether it simple or complex one,can be represented as summation of orthogonal basis functions.

Here, what the terms orthogonal and basis functions denote in case of signals? Can anyone explain concept with an example?

Also,what are the physical implications of basis functions?

Here, what the terms orthogonal and basis functions denote in case of signals? Can anyone explain concept with an example?

Also,what are the physical implications of basis functions?

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