<P> Spatial aliasing of high - frequency luma or chroma video components shows up as a moiré pattern . </P> <P> The process of volume rendering samples a 3D grid of voxels to produce 3D renderings of sliced (tomographic) data . The 3D grid is assumed to represent a continuous region of 3D space . Volume rendering is common in medial imaging, X-ray computed tomography (CT / CAT), magnetic resonance imaging (MRI), positron emission tomography (PET) are some examples . It is also used for seismic tomography and other applications . </P> <P> When a bandpass signal is sampled slower than its Nyquist rate, the samples are indistinguishable from samples of a low - frequency alias of the high - frequency signal . That is often done purposefully in such a way that the lowest - frequency alias satisfies the Nyquist criterion, because the bandpass signal is still uniquely represented and recoverable . Such undersampling is also known as bandpass sampling, harmonic sampling, IF sampling, and direct IF to digital conversion . </P> <P> Oversampling is used in most modern analog - to - digital converters to reduce the distortion introduced by practical digital - to - analog converters, such as a zero - order hold instead of idealizations like the Whittaker--Shannon interpolation formula . </P>

How does the sampling rate affect the transmitted digital signal