Folding

{
  "id": "MLC-T-CHM-004567",
  "term": "Folding",
  "field": "Chemistry",
  "definition": "A phenomenon in digital signal processing where frequencies higher than the Nyquist frequency are incorrectly represented as lower frequencies after sampling. This aliasing effect occurs when the sampling rate is insufficient to accurately capture the true frequency components of a signal. It can lead to misinterpretation of spectral data in techniques like Fourier transform spectroscopy.",
  "synonyms": [
    "aliasing"
  ],
  "subject": "Analytical Chemistry",
  "see_also": [
    "Nyquist criterion",
    "undersampling",
    "vibrational spectroscopy",
    "wavenumber in medium"
  ],
  "references": [
    "PAC, 2021, 93, 647. 'Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)' on page 659 (https://doi.org/10.1515/pac-2019-0203)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/folding/"
}