Coherent sampling calculator
Enter the value:
f DSAMPLE
MHz
f DIN
MHz
N RECORD
SIGFIG
recovery
calculate
result
f CSAMPLE
MHz
f CIN
MHz
When performing FFT transformation, if coherent sampling is not used, some problems will occur, such as spectrum leakage. In order to avoid spectrum leakage, there are generally two methods, one is to use correlated sampling, and the other is to use The window function is used for compensation to reduce the spectrum leakage, but it cannot be completely eliminated. Generally, there are different types of window functions. You can choose a suitable window function according to the actual situation. Regarding correlation sampling, you need to follow certain rules:
1) The sampled signal needs to be divided into cycles;
2) Fs/N=Ft/M, Fs is the sampling frequency, N is the number of sampling points, Ft is the frequency of the sampled signal, and M is the number of cycles of the sampled signal;
3) In addition, M and N need to be mutually prime numbers and both need to be integers, which can avoid repeated sampling and improve efficiency.
