Howtosignalprocessing
- What should be the sampling frequency?
- What is the minimum sample frequency needed to reconstruct an analog signal?
- What is produced when the sampling frequency is not at least twice the signal frequency?
- What is sampling rate and sampling frequency?
What should be the sampling frequency?
The sampling frequency or sampling rate, fs, is the average number of samples obtained in one second, thus fs = 1/T. Its unit is sample per second or hertz e.g. 48 kHz is 48,000 samples per second.
What is the minimum sample frequency needed to reconstruct an analog signal?
The Sampling Theorem states that a signal can be exactly reproduced if it is sampled at a frequency F, where F is greater than twice the maximum frequency in the signal. The sampling rate for an analog signal must be at least two times as high as the highest frequency in the analog signal in order to avoid aliasing.
What is produced when the sampling frequency is not at least twice the signal frequency?
Aliasing occurs because signal frequencies can overlap if the sampling frequency is too low. Frequencies "fold" around half the sampling frequency - which is why this frequency is often referred to as the folding frequency.
What is sampling rate and sampling frequency?
Sampling rate or sampling frequency defines the number of samples per second (or per other unit) taken from a continuous signal to make a discrete or digital signal.
