Enter your Sampling Frequency and Signal Frequency (with your chosen Frequency Unit) to calculate the Nyquist Frequency, check the Aliasing Status of your signal, and find the Perceived Frequency and Minimum Sampling Rate needed to capture it cleanly.
Nyquist Frequency
--
Aliasing Status
--
Perceived Frequency
--
Minimum Sampling Rate
--
The Nyquist frequency is half of the sampling rate of a digital signal processing system. It represents the highest frequency that can be accurately represented in the sampled signal without aliasing.
According to the Nyquist-Shannon sampling theorem, the minimum sampling rate must be at least twice the highest frequency component in the signal. This is called the Nyquist rate.
Aliasing occurs when the signal frequency exceeds the Nyquist frequency. The signal appears at a lower frequency in the sampled data, causing distortion and loss of the original signal information.
CD audio uses 44.1 kHz sampling because human hearing extends up to about 20 kHz. The 44.1 kHz rate provides a Nyquist frequency of 22.05 kHz, safely above the audible range with room for anti-aliasing filters.
Oversampling uses a sampling rate much higher than the Nyquist rate. It reduces noise, simplifies anti-aliasing filter design, and improves the signal-to-noise ratio in the final output.
In ADC and DAC systems, the Nyquist frequency determines the maximum input frequency that can be converted without aliasing. It's crucial for analyzing dynamic performance and harmonic distortion.