Sub Nyquist artefacts and samplingmoiré effects

Abstract

Sampling moiré effects are well known in signal processing. They occur when a continuous periodic signalg(x) is sampled using a sampling frequencyfsthat does not respect the Nyquist condition, and the signal-frequencyf folds over and gives a new, false low frequency in the sampled signal. However, some visible beating artefacts may also occur in the sampled signal when g(x)is sampled using a sampling frequencyfs which fully respects the Nyquist condition.