nyquist frequency
Definition
Noun (Telecommunications): The minimum rate at which a signal can be sampled without introducing errors, which is twice the maximum frequency component present in that signal.
Usage
This term is used in the fields of signal processing, telecommunications, and data acquisition to define a critical sampling criterion. * To avoid a distortion called aliasing, you must sample at a rate higher than the Nyquist frequency. * The engineer calculated the Nyquist frequency to determine the required capabilities of the analog-to-digital converter. * If a signal contains components up to 10 kHz, its Nyquist frequency is 20 kHz.
Advanced Usage
- Nyquist Rate: Often used synonymously with "Nyquist frequency," though technically the Nyquist rate is samples per second, where is the highest frequency.
- Nyquist-Shannon Sampling Theorem: The fundamental theory which states that perfect reconstruction of a signal is possible if the sampling frequency exceeds the Nyquist frequency.
- Aliasing: The distortion that occurs when a signal is sampled at a rate below its Nyquist frequency, causing higher frequencies to appear as lower frequencies.
Variants and Related Words
- Nyquist Rate (n): The sampling rate (in samples per second) equal to twice the highest frequency in a signal.
- Nyquist Theorem / Shannon-Nyquist Theorem (n): The formal statement of the sampling theorem.
- Aliasing (n): The undesirable effect of improper sampling below the Nyquist frequency.
Synonyms
- Minimum sampling rate
- Critical sampling frequency
Related Concepts (Not Phrasal Verbs or Idioms)
- Sampling Frequency / Sampling Rate: The actual number of samples taken per second.
- Bandwidth: The range of frequencies within a signal, which determines the maximum frequency ().
- Anti-aliasing Filter: A filter applied before sampling to remove frequency components above the Nyquist frequency.
Noun
-
(telecommunication) twice the maximum frequency occurring in the transmitted signal
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