Given two baseband signals f(t) and g(t), suitably restricted in amplitude and bandlimited to [λ, μ] and [−μ, −λ], 00, i.e., that the baseband signals be bandpass, is not essential but it is a practical constraint in approximating the required operations. Also a modification is given for conserving bandwidth in case the signals f(t) and g(t) are of disparate bandwidths.
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B. F. Logan (1983) studied this question.
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