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Which are orthonormal signal representation?

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Which are orthonormal signal representation?

(a) Sine and cosine at same frequency

(b) Wavelets

(c) Complex sinusoids at a different frequency

(d) All of the mentioned

I got this question in quiz.

My question is from Signals in chapter Signals and Spectra of Digital Communications

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Right choice is (d) All of the mentioned

To explain I would say: Some of the common orthonormal signal representations are sine and cosine at the same frequency, Fourier serier, sinc functions centered at sampling times, wavelets etc.

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