Consider the signal s(t) = m(t)cos (2^$\pi$ f_c t) +^$\hat{m}$ (t) (2^$\pi$f_c t), where ^$\hat{m}$ (t) denotes the Hilbert transform of m(t) and the bandwidth of m(t) is very small compared to f_c. The signal s(t) is a

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