When one samples a bandpass arresting at a amount lower than the Nyquist rate, the samples are according to samples of a low-frequency alias of the high-frequency signal; the aboriginal arresting will still be abnormally represented and recoverable if the spectrum of its alias does not cantankerous over bisected the sampling rate. Such undersampling is aswell accepted as bandpass sampling, harmonic sampling, IF sampling, and absolute IF to agenda conversion.4
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