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The minimum rate at which a signal can be sampled without introducing errors, which is twice the highest frequency present in the signal.
‘For any outline, the total power is calculated as the sum, from 1 to n, of individual harmonic powers where n is equal to the Nyquist frequency.’
‘But the signal has to be treated with a low-pass filter not higher than half (Nyquist rate) of the sampling frequency, otherwise the reconstruction of the curve from digital data may contain artifacts.’
‘The Nyquist Frequency corresponds to the highest frequency at which a signal can contain energy and still be compatible with the Sampling Theorem.’
‘We used the Signal-RTS software to digitize the recorded calls (sampling rate: 12500 Hz for the túngara frogs, and 25000 Hz for the cricket frogs, higher than 1.5 times of the Nyquist frequency for all calls recorded).’
‘This frequency limit is known as the Nyquist frequency.’