Aliasing

Illustration of time domain aliasing cancellation (TDAC, MDCT, lapped transform)

Illustration of time domain aliasing cancellation (TDAC, MDCT, lapped transform)
  1. What is aliasing in time domain?
  2. What is the effect of aliasing in time domain?

What is aliasing in time domain?

Aliasing can occur in signals sampled in time, for instance digital audio, or the stroboscopic effect, and is referred to as temporal aliasing. It can also occur in spatially sampled signals (e.g. moiré patterns in digital images); this type of aliasing is called spatial aliasing.

What is the effect of aliasing in time domain?

When a signal is undersampled in the frequency domain or has inadequate frequency resolution (aka freq domain aliasing), its spectrum has overlapping tails. That means that it is no longer possible to correctly reconstruct the time-domain signal. The spectrum tails do not go to zero, but are folded back.

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