Nyquist Sampling Rate Calculator
Calculate the minimum sampling rate needed to faithfully capture a signal using the Nyquist-Shannon theorem.
kHz
x
Minimum (Nyquist) Rate
40.0 kHz
Practical Rate (with oversampling)50.0 kHz
Sample Period20.00 µs
Minimum (Nyquist) Rate vs Maximum Signal Frequency
Nyquist-Shannon Sampling Theorem
Formula
f_sample >= 2 x f_max
The minimum sampling rate must be at least twice the highest signal frequency to avoid aliasing. In practice, sample at 2.5x or higher and use an anti-aliasing filter.
Example Calculation
Audio signal with 20 kHz maximum frequency, 2.5x oversampling.
- 01Nyquist rate = 2 x 20 = 40 kHz (minimum)
- 02Practical rate = 2.5 x 20 = 50 kHz
- 03Sample period = 1000 / 50 = 20 us
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