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InterviewSolution
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Distinguish between continuous and digital signals. |
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Answer» A continuous time signal is an analog representation of a natural signal, with characteristically smooth transitions between peaks and valleys. A discrete time signal is a digital representation of a continuous signal, it has a magnitude that is held constant for the duration of each sample, otherwise known as a zero-order hold. The main difference between the two signals is the zero order hold— the discrete signal can be considered a copy of its counterpart continuous signal, but with added noise.The advantage of the discrete signal is that it is a repeatable signal, with digital fidelity between successive generations, the disadvantage is the added noise which colors the signal. Typically this noise is smoothed out using an RC circuit, with a time constant determined by the Nyquist frequency of the discrete signal. |
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