Definition

1. Noun:
   • (Telecommunications): The minimum sampling frequency required to accurately convert a continuous analog signal into a discrete digital signal without loss of information. Specifically, it is twice the highest frequency component present in the original analog signal.

Usage Examples

• Noun:
  • To digitize this audio signal without aliasing, you must sample at or above the Nyquist rate.
  • The engineer calculated the Nyquist rate for the bandwidth of the communication channel.
  • A common pitfall in signal processing is sampling below the Nyquist rate, which causes distortion.

Advanced Usage

• "To satisfy the Nyquist rate": To meet or exceed the minimum required sampling frequency.
  • The design specification requires the analog-to-digital converter to satisfy the Nyquist rate for all expected input signals.
• "Nyquist rate criterion": The rule or condition defined by the Nyquist rate.
  • Adherence to the Nyquist rate criterion is fundamental for faithful signal reproduction.

Variants and Related Words

• Nyquist frequency (n): A related term, specifically defined as half of the sampling rate. It represents the maximum frequency that can be accurately represented at a given sampling rate.
  • The signal's frequency must be less than the Nyquist frequency to avoid aliasing.
• Nyquist-Shannon sampling theorem (n): The foundational theorem in information theory that establishes the Nyquist rate as a necessary condition for perfect signal reconstruction.
  • The Nyquist-Shannon sampling theorem is a cornerstone of digital signal processing.

Synonyms

• Minimum sampling rate: The lowest acceptable rate for sampling.
• Critical sampling frequency: The threshold frequency for accurate sampling.

Related Concepts

• Aliasing (n): The distortion or artifact that occurs when a signal is sampled at a rate below its Nyquist rate.
  • Aliasing was evident in the digitized image because the sampling rate was too low.
• Sampling theorem (n): The general principle underlying the Nyquist rate.
  • The sampling theorem provides the theoretical basis for converting analog signals to digital.

Noun

1. (telecommunication) the lowest sampling rate that will permit accurate reconstruction of a sampled analog signal