- Optical filter that excludes radiation of wavenumber lower (wavelength higher) than a certain value and passes radiation of wavenumber above (wavelength lower) than this value.
- Electrical filter that blocks signal with a modulation frequency lower than a certain cut-on value and passes signals of frequency above this value.
See also: low-pass filter
Source:
PAC, 2021, 93, 647. 'Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)' on page 661 (https://doi.org/10.1515/pac-2019-0203)