What happens if the sampling frequency is less than the Nyquist rate?

As the sampling frequency decreases, the signal separation also decreases. When the sampling frequency drops below the Nyquist rate, the frequencies will crossover and cause aliasing.

How do you tell if a signal is aliased?

The undersampled waveform is constructed to look like a slower frequency waveform or a flat line when the sample rate is the same as the frequency of your signal. You can detect aliasing by running a horizontal test on your oscilloscope. If the shape of the waveform changes drastically, you may have aliasing.

What is the difference between Nyquist rate and Nyquist frequency?

1 Answer. The Nyquist rate is the minimal frequency at which you can sample a signal without any undersampling. It’s double the highest frequency in your continous-time signal. Whereas the Nyquist frequency is half of the sampling rate.

What happens when sampling rate is too high?

Oversampling is capable of improving resolution and signal-to-noise ratio, and can be helpful in avoiding aliasing and phase distortion by relaxing anti-aliasing filter performance requirements. A signal is said to be oversampled by a factor of N if it is sampled at N times the Nyquist rate.

What is Nyquist theorem in audio?

The rule which states that a digital sampling system must have a sample rate at least twice as high as that of the highest audio frequency being sampled, in order to avoid aliasing and thus reproduce the wanted audio perfectly.

What is Nyquist rate in digital communication?

The Nyquist rate or frequency is the minimum rate at which a finite bandwidth signal needs to be sampled to retain all of the information. If a time series is sampled at regular time intervals dt, then the Nyquist rate is just 1/(2 dt ).

What happens at Nyquist frequency?

The Nyquist-Shannon sampling theorem (Nyquist) states that a signal sampled at a rate F can be fully reconstructed if it contains only frequency components below half that sampling frequency: F/2. When a component of the signal is above the Nyquist, a sampling error occurs that is called aliasing. …