Howtosignalprocessing
- How is the maximum frequency correlated to the sampling rate?
- What is the maximum sampling frequency?
- Why is it important to set the sampling rate higher than the maximum frequency measured?
- What will happen when sampling rate is less than Nyquist rate?
How is the maximum frequency correlated to the sampling rate?
In fact, the maximum bandwidth of a sampled waveform is determined exactly by its sampling rate; the maximum frequency representable in a sampled waveform is termed its Nyquist frequency, and is equal to one half the sampling rate.
What is the maximum sampling frequency?
Theoretically the maximum frequency that can be represented is half the sample rate (known as the Nyquist frequency). In practice, the limit is a little lower, so the practical upper frequency limit for a sample rate of 44,100 Hz, is a little over 20,000 Hz, but less than 22,050 Hz.
Why is it important to set the sampling rate higher than the maximum frequency measured?
If the signal contains high frequency components, we will need to sample at a higher rate to avoid losing information that is in the signal. In general, to preserve the full information in the signal, it is necessary to sample at twice the maximum frequency of the signal.
What will happen when sampling rate is less than Nyquist rate?
If the Nyquist theorem is not obeyed, higher frequency information is recorded in too low a sample rate, resulting in aliasing artifacts. Several techniques can reduce aliasing in a reproduced signal.
