# Translations:Frequency response of a digital system/15/en

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it follows that the frequency response is periodic in , with a period of . As a result, we have to examine only the frequency response over one period, which usually is taken from the point to the point . The frequency is known as the *Nyquist frequency*, which we discussed in Chapter 4. For a causal system, the frequency response is the one-sided discrete Fourier transform