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Sampling

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Sampling

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Sampling

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Aliasing

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Nyquist Theorem (sampling theorem)

A real signal whose spectrum is bandlimited to B Hz can be reconstructed exactly, without any

error, from its samples taken uniformly at a rate Fs

> 2B Hz

In practice, where filters are not ideal, sampling rates are usually chosen modestly above the Nyquist rate; a rate 20% greater is common.

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Excercise

A sample speech signal contains

frequencies up to 4 kHz, which is the

minimum sampling rate?

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Is the Nyquist Theorem satisfied?

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Sampling comparation

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Time and frequency domain

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Video

time2freq.ogv

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Referencias

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