# A Unit Impulse Signal

Explore how a unit impulse signal forms the fundamental unit of discrete-time signals.

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No computer can plot a continuous-time sine wave. When we see such a figure on our screen, it’s in fact an interpolated version of a discrete-time sine wave in which the samples are joined together with straight lines.

## A discrete-time sinusoid

To understand this idea, let’s generate another sinusoid but with a low sample rate. Here, we don’t join the individual samples to display the discrete-time signals, as shown below:

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