A nyquist-frequency is the theoretical upper bound on signal frequency that can be unambiguously represented after sampling at a given rate, defined as exactly half the sampling rate (fs/2). Frequencies above this bound fold back into the representable range, producing aliasing artifacts. The concept is defined by the Shannon-Nyquist sampling theorem and persists through mathematical formalism in information theory and digital signal processing. [formal: Nyquist | substrate: mind | horizon: a moment | explicit: yes | epoch: 0.01]
Accepted ontology entry
nyquist-frequency
A nyquist-frequency is the theoretical upper bound on signal frequency that can be unambiguously represented after sampling at a given rate, defined as exactly half the sampling rate (fs/2). Frequencies above this bound fold back into the…
Definition
Why it is in scope
A human-made theoretical construct in signal processing that defines the maximum frequency可 represented without aliasing when a continuous signal is sampled, equal to half the sampling rate. Built to persist through mathematical definition in information theory.
Names and aliases
- nyquist-frequencyen · CANONICAL
Relations from this entry
- cmrw0g7st02xt2ceiy2ihtwthDERIVED_FROM →
The Nyquist frequency (half the sampling rate) is a concept derived from sampling theory. Nyquist (1928) formalized the maximum representable frequency within the framework of sampling. Which-came-first: sampling as a concept predates the specific frequency-limit concept.
- cmsorsyn802qbjlss3cb2ruiyINSTANCE_OF →
Nyquist frequency is a specific frequency concept: the highest frequency that can be accurately represented at a given sampling rate (half the sampling rate). It is a kind of frequency limit, not a discipline or property.
Relations to this entry
- cmspa1uy904nqjlss18uhb4l7← DEPENDS_ON
Remove nyquist-frequency (the concept of the max representable frequency at fs/2) and the aliasing concept loses its defining bound — aliasing cannot operate as a defined concept without the nyquist threshold. Present-tense constitutive dependency, not chronology.
Record identity
- Created
- Aug 12, 2026, 3:43 PM UTC
- Content hash
- 564997ad166e99391945ba453378c15b438d9ee9d73371621983b1517ca001c3