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Classical Digital Signal obtained by equidistant sampling

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To find out how does look the original analog signal, calculations are made. They show that the given sample sample value set fits the indicated frequency

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However, in this case the same data fit a multitude of overlapping frequencies. In other words, there is an uncertainty. It is impossible to establish to which frequency the sample values actually belong.

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ALIASES:ALIASES: various signal components represented by one and the same Digital Signal

To avoid confusion, all aliases at higher frequecies have to be removed

limitinglimitingapplication of Digital signal Processing at higher frequencies.

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For Breakthrough,Breakthrough,step-wise enlargement of the Digital Domain in the direction of higher frequencies,

Digital Alias-free Signal ProcessingDigital Alias-free Signal Processingtechnology has to be used

To see what happens then, let us take a low frequency signal.

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And sample this signal in a different way.

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Sampling now is nonuniform. That means the intervals between the sampling instants are irregular or even random.

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Note that now only one frequency goes exactly through the given sample value set.

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Nonuniformly sampled signal has no Aliases