Howtosignalprocessing
- What happens if you sample below the Nyquist frequency?
- What happens above Nyquist frequency?
- What is caused when signal frequencies are produced above the Nyquist frequency?
- What happens at Nyquist frequency?
What happens if you sample below the Nyquist frequency?
When the sampling frequency drops below the Nyquist rate, the frequencies will crossover and cause aliasing.
What happens above Nyquist frequency?
Above Nyquist frequency, seismic signal with higher frequencies are reconstructed in the form of seismic signal with lower frequencies. The highest frequency that can be successfully recovered from sampled seismic data is one half divided by the sample period.
What is caused when signal frequencies are produced above the Nyquist frequency?
When a component of the signal is above the Nyquist, a sampling error occurs that is called aliasing. Aliasing “names” a frequency above Nyquist by an “alias” the same distance below Nyquist. Sinusoidal signal at 1.3 times Nyquist before sampling into pixels.
What happens at Nyquist frequency?
The Nyquist rate is 2x the given frequency to be measured accurately. The theorem can be used in reverse. The Nyquist frequency is the highest frequency that equipment of a given sample rate can reliably measure, one-half the given sample rate.
